The Aphid Alert Season Summary

What I would define as a high aphid number year has come to a close.  Most trap locations had at least moderate total seasonal trap catch numbers and some much higher.  There were 4 locations whose total seasonal trap catch exceeded 200 individual aphid vector; Walhalla, Hatton (which had close to 250), and the Linton II (which had close to 300) ND sites and Staples MN.  Much of this resulted frm later season flights.  The Linton II trap had high aphid captures throughout most of the summer and then their numbers declined later in the season.  Alternatively, most of the seasonal catch in the other 3 locations resulted from one or two very high weekly captures; in Hatton and Staples this was the sample period ending Aug 23, Walhalla had two significant flights during the Aug 23 period and then again 2 weeks later in the period ending Sept 6.

Many of the other sites also had high catch numbers; the Linton I site, Hoople and Forest River in ND and Gully in MN all captured close to or in excess of 100 individual aphid vectors.  There were a number of sites that would be categorized as having moderate numbers of seasonal catch; Lake of the Woods, Crookston, Erskine, Sabin, and Perham MN all had seasonal cpatures of close to or exceeding 50 individual aphid vectors.  The remaining sites (Cando ND, Stephen and Syre MN) all had lower capture numbers but traps there still recovered important vector species.

This year's results seem to support the idea that most of our aphid flight, and therefore most of our virus movement, occurs later in the season.  The application of crop oil and antifeedant insecticides have potential to decrease virus movement within fields but it may be that killing vines prior to some of the heaviest aphid flights may also decrease the introduction and movement of inoculum.  Given our late planting and drought conditions in many locations this season, this obviously would have been a difficult year to implement this tactic.

The Aphid Alert II network will be back next year, we are hoping to increase the number of traps and refine the resolution of our network.  Thanks and appreciation are due to all of our cooperators - we are hoping you're willing to host again next year and we'll soon be in touch regarding storing and servicing the traps.  I hope harvest went well for all.

Cumulative Seasonal Catch (click on the image for larger version)

Graphical

Cumulative Seasonal Catch (click on the image for larger version)

Here's the catch for Samples Identified up to Sept 19*

Weekly trap catches were down in all locations with green peach aphids being recovered in Hoople and Crookston.  The season is shutting down and aphid flights of all species were down this week, including soybean aphids and Buckthorn aphids (both may already have made return flights to their overwintering host, buckthorn).  Trap reports are decreased as well; several sites have harvested and traps are out of the field. 


In reviewing the seasonal cumulative trap catches, 7 sites had more than 100 total vector captures, 4 of these had over 200 total captures. Given past history of suction trap results, this would qualify as a high vector year.



* These trap catches sorted and ID'd in this report were trapped in the previous week.  It generally takes 2 days to receive trap catches after being returned by a cooperator and then 1-2 days to be sorted and ID'd.  The results will be updated again Aug 23.  If needed, contact the lab at  218.281.8633 and ask for Ian or Nate...

Weekly Trap Catch (click on the image for larger version)   

Cumulative Seasonal Catch (click on the image for larger version)

 

Here's the catch for Samples Identified up to Sept 13*
Weekly trap catches were down in all locations with the exception of Walhalla, ND (this may represent two weeks of samples).  A significant number of these were green peach aphids.

Trap catches appear to be decreasing, indicating aphid movement is slowing.  Nights have been getting colder and the movement of several species over the past two weeks may indicate many aphid vector species are moving to their overwintering hosts.  

On notable exception to this general decrease in aphid populations is Walhalla, ND, which has effectively doubled its seasonal capture total in the past two weeks alone (102 vector species captured).  As we did not receive a sample from Walhalla last week, this may indicate 2 weeks of capture.  Approximately 10% of this capture were green peach aphids (11 total) although this was the only site to report this species this period.  Also numerous were bird cherry oat aphids (18), thistle aphids (25), cotton/melon aphids (27), and buckthorn aphids (15).  In addition there were numerous non-vector species in the trap indicating Walhalla had experienced significant aphid flight in the past 2 weeks.   The two traps in Linton, ND receovered a total of 16 aphids between them and Gully, MN recovered 10.

The weekly total number of soybean aphids captured is down but they were still reported from 5 locations (Walhalla, both Linton site, Gully and Sabin).

Hopefully aphid captures will continue to decrease over the region over the next week.  Several sites have already killed their adjacent fields so will no longer be reporting data.


Scouting & treating aphids in potatoes:

• select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
• avoid leaves on the ground or in contact with the soil.
• in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of standard broad-spectrum insecticides are not an effective control for PVY (by the time the aphid has been exposed and dies, it can have moved PVY inoculum into and, more importantly, within the field.
• the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
• in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding

Always read the label!!

* These trap catches sorted and ID'd in this report were trapped in the previous week.  It generally takes 2 days to receive trap catches after being returned by a cooperator and then 1-2 days to be sorted and ID'd.  The results will be updated again Aug 23.  If needed, contact the lab at  218.281.8633 and ask for Ian or Nate...

Weekly Trap Catch (click on the image for larger version)   

 

Cumulative Seasonal Catch (click on the image for larger version)

Here's the catch for Samples Identified up to Sept 6*
Aphid trap captures were lower in all locations but one.

We are getting later in the season but aphids are still flying; numbers are definitely down this week but both soybean and green peach aphids are making appearances in more locations.  Aphid suction trap captures were lower than last week in all locations save Lake of the Woods (which had its largest capture to date, 40 vector species).  Several locations, while down from last week, still had high numbers of aphid vectors; Hoople, Hatton and Forest River, ND captured 24, 19 and 32 vectors species (respectively) while the trap at the Staples location captured 16 aphids.

Some of the more important vector species were captured in higher numbers than they have been in previous weeks. Green peach aphids were recovered from Cando, Hoople and Crookston this week, while soybean aphids showed up in the traps at Cando, Hoople, Forest River, Hatton, Sabin, Perham and Staples.  These may represent movement of soybean aphids back to Buckthorn (their overwintering host), Buckthorn aphids (closely related to soybean aphid) were also flying this week and were recovered in traps from Forest River, Hatton, Gully and Crookston.  A relatively large flight of potato aphids was recovered from the trap at Hatton and cereal aphids were still present in numbers at several locations, over half of the aphids trapped this week in the Lake of the Woods trap were bird cherry oat aphids (24 of 40 captured).  These may have been coming off turf grass and grass seed fields.

We continue to have an aphid year, so if you still have plants in the field that have not yet started to die back or have not yet been killed...

 

KEEP SCOUTING!!

Scouting & treating aphids in potatoes:

• select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
• avoid leaves on the ground or in contact with the soil.
• in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of standard broad-spectrum insecticides are not an effective control for PVY (by the time the aphid has been exposed and dies, it can have moved PVY inoculum into and, more importantly, within the field.
• the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
• in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding

Always read the label!!

* These trap catches sorted and ID'd in this report were trapped in the previous week.  It generally takes 2 days to receive trap catches after being returned by a cooperator and then 1-2 days to be sorted and ID'd.  The results will be updated again Aug 23.  If needed, contact the lab at  218.281.8633 and ask for Ian or Nate...

Weekly Trap Catch (click on the image for larger version)   

 

Cumulative Seasonal Catch (click on the image for larger version)

Here's the catch for Samples Identified up to Aug 28*
Extreme vector numbers in some locations

Aphid in several locations showed very high catches in the past week.  Traps at Walhalla (101) and Hoople (165) and Staples (102) recovered from 2x to 5x their cumulative season's catch in just 1 week!  Other locations also trapping higher numbers of aphid vectors than in past weeks were Cando (13) and Forest River (65), and Crookston (19). Gully recovered high numbers for the second week in a row (40).  Non-vector aphid species were also numerous this week, indicating aphid dispersal was quite active.

Green peach aphids were recovered from only the trap in Cando while Soybean aphids were recovered Walhalla, Hoople, Forest River, Linton, Gully, Crookston and Staples. Soybean aphid is closely related to buckthorn aphid, sharing its overwintering host so it isn't surprising that buckthron aphid was recovered from numerous locatinos as well (Walhalla, Hoople, Linton, Lake of the Woods, Gully, Crookston, Sabin and Staples.

Several sites will no longer be reported as the vines in the adjacent fields have been killed and are likely no longer attractive to aphid vector species.

Late season vector pressure is increasing and late season transmission of PVY is thought to account for much of the infection in the region.  Vector pressure continues.


KEEP SCOUTING!!

Scouting & treating aphids in potatoes:

• select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
• avoid leaves on the ground or in contact with the soil.
• in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of standard broad-spectrum insecticides are not an effective control for PVY (by the time the aphid has been exposed and dies, it can have moved PVY inoculum into and, more importantly, within the field.
• the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
• in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding

Always read the label!!

* These trap catches sorted and ID'd in this report were trapped in the previous week.  It generally takes 2 days to receive trap catches after being returned by a cooperator and then 1-2 days to be sorted and ID'd.  The results will be updated again Aug 23.  If needed, contact the lab at  218.281.8633 and ask for Ian or Nate...

Weekly Trap Catch (click on the image for larger version) 

 

Cumulative Seasonal Catch (click on the image for larger version)

 

Here's the catch for Samples Identified up to Aug 23*

While trap captures were still significant, the numbers captured at many locations were down this week (with 5 locations yet to be sorted and ID'd).   The two sites that had increased captures (Gully and Perham) had big increases, in the case of Gully, most of these were bird cherry oat aphids.  There were no green peach aphids recovered at this time but soybean aphids were recovered from traps in Hoople, Hatton, Forest River, and Linton, ND and Perham and Staples, MN.  in most years, numbers of soybean aphids can be expected to increase and their distribution to broaden later in the season so these numbers are not surprising.

Cereal aphid captures remain high with bird cherry at and English grain aphids being common in most locations.  Likewise, non-vector species also were numerous in the traps this week, indicating aphid movement is still active for many species.

So, vector pressure continues - if you have not yet vine killed, then...

KEEP SCOUTING!!

Scouting & treating aphids in potatoes:

• select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
• avoid leaves on the ground or in contact with the soil.
• in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of standard broad-spectrum insecticides are not an effective control for PVY (by the time the aphid has been exposed and dies, it can have moved PVY inoculum into and, more importantly, within the field.
• the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
• in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding

Always read the label!!

* These trap catches sorted and ID'd in this report were trapped in the previous week.  It generally takes 2 days to receive trap catches after being returned by a cooperator and then 1-2 days to be sorted and ID'd.  The results will be updated again Aug 23.  If needed, contact the lab at  218.281.8633 and ask for Ian or Nate...

Weekly Trap Catch (click on the image for larger version)

Cumulative Seasonal Catch (click on the image for larger version)

Here's the catch for the Trapping Period ending Aug10*

Aphids continue to fly in the Red River Valley and beyond and vector captures increased in several locations this week. Catches in Hoople and Forest River (ND) and Stephen, Crookston, Erskine and Perham (MN) all recovered aphid vectors.  Green peach aphids were recovered in the Hoople trap and soybean aphids were recovered in the Linton locations, Forest River, Stephen, Crookston, Lake of the Woods, Staples and Perham traps.  Cereal aphids continued to be recovered in numbers from most locations.  Additionally, there have been reports of potato aphids in flax in Roseau, MN.  We continue to have an aphid summer in MN and ND.
So, vector pressure continues - if you have not yet vine killed, then...

KEEP SCOUTING!!

Scouting & treating aphids in potatoes:

• select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
• avoid leaves on the ground or in contact with the soil.
• in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of standard broad-spectrum insecticides are not an effective control for PVY (by the time the aphid has been exposed and dies, it can have moved PVY inoculum into and, more importantly, within the field.
• the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
• in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding

Always read the label!!

* the posts will be updated again Aug 16.  If needed, contact the lab at  218.281.8633 and ask for Ian or Nate...

Weekly Trap Catch (click on the image for larger version)

Cumulative Seasonal Catch (click on the image for larger version)

 

Here's the catch for the Trapping Period ending Aug03*

The cooler temperatures have slowed population development resutling in lower captures this week but a number of locations are still reporting significant aphid captures.  Thankfully, this week we have not yet recovered any green peach aphids or soybean aphids (we still have 4 traps yet to identify from that period).   This remains an aphid year and flights are still expecting to continue.  If you have not yet vine killed, then...

KEEP SCOUTING!!

THE GRAPHS AT THE BOTTOM OF THE PAGE ARE LAST WEEK"S THEY WILL BE UPDATED WHEN ALL TRAPS ARE PROCESSED!
 

Scouting & treating aphids in potatoes:

• select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
• avoid leaves on the ground or in contact with the soil.
• in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of standard broad-spectrum insecticides are not an effective control for PVY (by the time the aphid has been exposed and dies, it can have moved PVY inoculum into and, more importantly, within the field.
• the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
• in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding

Always read the label!!

*We're a little behind this week, traps are full of other insects (possibly envious of all the attention aphids are getting!)  If needed, contact the lab at  218.281.8633 and ask for Ian or Nate...

Weekly Trap Catch (click on the image for larger version)

 
 Cumulative Seasonal Catch (click on the image for larger version)

Here's the catch for the Trapping Period ending July 29*

The number of aphid vectors recovered at many sites decreased this week, however, with the Sturgis Rally right around the corner, we might expect the Sturgis Dispersal Event (coined by Bruce Potter at the SWROC in Lamberton) to bring us soybean aphids in the next 2 weeks.  While the name may seem light-hearted, it does accurately describe roughly the timing of a late season movement of soybean aphids (generally late July / early August) that often bring aphids into northern Minnesota, North Dakota, and Manitoba.  Soybean aphids have been recovered from several locations (especially Crookston, MN) for the past 3 sampling weeks.

Aphid populations are well-established in the region by now, small grains began have been senescing and the traps at many locations have been recovering cereal aphids for several weeks now.  There are vectors in the region and aggressive management is recommended!

KEEP SCOUTING!!


Scouting & treating aphids in potatoes:

• select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
• avoid leaves on the ground or in contact with the soil.
• in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of standard broad-spectrum insecticides are not an effective control for PVY (by the time the aphid has been exposed and dies, it can have moved PVY inoculum into and, more importantly, within the field.
• the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
• in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding

Always read the label!!
 
*We are moving to 2 reports/week.  We will be updating the site on Mondays and Thurs/Fri to ensure trap captures are reported within 2-3 days of receipt and identification here at the NWROC Entomology lab in Crookston.  Sorting and identification time is decreasing and we're slugging through the material, but it's often slow-going when very full trap jars make their way into the lab (then it gets fun!).

If needed, contact the lab at  218.281.8633 and ask for Ian or Nate...

Weekly Trap Catch (click on the image for larger version)

Cumulative Seasonal Catch (click on the image for larger version)

Here's the catch for the Trapping Period ending July 21*.

Green peach aphids (GPA) have been recovered in several traps this week; traps in Forest River (ND) and Crookston, Perham and Staples (MN) all recovered GPA.  Green peach aphid is perhaps the most efficient vector of PVY.  Its appearance is further indication aggressive scouting and management are a good idea this season.  Soybean aphid (SBA) also continues to make its presence known this week; the traps at Walhalla and Linton II (ND) and Gully and Crookston (MN) all recovered SBA this past week.  While not as effective a vector of PVY as is
green peach aphid, soybean aphids are probably the second most important vector in the disease epidemic because their dispersal events involve very high numbers of the aphid.  We can expect increased movement of soybean aphids over the next 2 weeks, reports from Bruce Potter at the SW Resarch & Outreach Center indicate soybean aphids there are developing wings and this indicates an impending dispersal event.  Southerly winds will bring increasing numbers of soybean aphids into the Red River Valley from southern locations.

Trap catches are variable this week at different locations with some trap locations recovering increased numbers and others recovering lower numbers of aphids.  Vector species persist, and non-vector species continue to be recovered, indicating aphid movement is occurring. For the species captured at each location, see the weekly and cumulative tables below.  For a quick glance at the seasonal pattern of vector capture, see the bar graphs near the bottom of the page.


Scouting & treating aphids in potatoes:

• select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
• avoid leaves on the ground or in contact with the soil.
• in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of standard broad-spectrum insecticides are not an effective control for PVY (by the time the aphid has been exposed and dies, it can have moved PVY inoculum into and, more importantly, within the field.
• the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
• in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding

Always read the label!!
*Traps are generally changed at the end of the week and the contents sent to us at the NWROC Entomology lab in Crookston.  It takes approx. 1 week to sort and identify the trap contents.  Because trap counts were late this week due to field work, we included all trap catches received up until Wed July 21.  Therefore some trap reports represent >7 day trapping period.  

Weekly Trap Catch

Cumulative Seasonal Catch

Fri., July 17, 2013

Here's the catch for the Trapping Period ending July 12*.

Aphid catches in many locations took a very large jump this week.  At least one site reported Green Peach Aphids and 3 locations reported Soybean aphids. This is developing into a potentially high aphid year; the appearance of the two most important vectors of PVY is concerning.  While the seasonal timing for the movement of aphid vectors into potato fields is well within the expected time frame, many fields throughout the region were planted late, and so the plants are younger than they ordinarily would be at this time.  The younger the plant is when it contracts the virus, the greater the concentration of virus will develop in the plant by the end of the season.  This means later flights of aphids (esp. late season soybean aphids) entering seed potato fields will have more inoculum to move around the current aphids are not prevented from entering fields and probing plants now.  Aggressive and vigilant scouting is recommended, the application of crop oils, if not already begun, should start now.  If aphids are already in fields, the use of the anti-feedant insecticides, Fulfill or Beleaf can be applied to prevent some transmission and within-field movement of PVY.

Scouting & treating aphids in potatoes:

• select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
• avoid leaves on the ground or in contact with the soil.
• in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of standard broad-spectrum insecticides are not an effective control for PVY (by the time the aphid has been exposed and dies, it can have moved PVY inoculum into and, more importantly, within the field.
• the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
• in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding

 Always read the label!!
*Traps are generally changed at the end of the week and the contents sent to us at the NWROC Entomology lab in Crookston.  It takes approx. 1 week to sort and identify the trap contents.  

Weekly Trap Catch

Cumulative Seasonal Catch

Fri., July 12, 2013

Here's the catch for the Trapping Period ending July 05*.


 Aphid catches in many locations are increasing.  If not already doing so, producers should be applying crop oils and scouting for aphids.  Remember, for crop oils to be most effective, they must be applied prior to the arrival of colonizing aphids.  If there are aphids already in the area, application of oils can still limit the spread of PVY. Data indicates applying crop oils twice weekly applications may be more efficacious than once weekly; rapidly growing plants will obviously benefit from more the more frequent application schedule.  It's important to use sufficient water to ensure complete coverage.

If aphids are found in fields, treatment with an anti-feedant insecticide such a Fulfill or Beleaf may be indicated. Both products recommend: waiting 7 days applications if a second is necessary, to use sufficient water to ensure complete coverage and ensuring new plant foliage is covered.  Because both insecticides work by stopping feeding, aphids may not die immediately, but feeding (and probing) will stop and with it, the transmission of PVY.

Aphid numbers in small grains are established in multiple locations and can be expected to move into potatoes as wheat matures.  Soybean aphid numbers are increasing in many areas in MN and ND.  This looks to be developing into an aphid vector year.  Scout vigilantly, manage aggressively.

Scouting & treating aphids in potatoes:

• select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
• avoid leaves on the ground or in contact with the soil.
• in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of standard broad-spectrum insecticides are not an effective control for PVY (by the time the aphid has been exposed and dies, it can have moved PVY inoculum into and, more importantly, within the field.
• the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
• in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding

 Always read the label!!

*Traps are generally changed at the end of the week and the contents sent to us at the NWROC Entomology lab in Crookston.  It takes approx. 1 week to sort and identify the trap contents.  Hopefully as the summer progresses we will be able to report trap catches more rapidly.

Weekly Trap Catch

Cumulative Seasonal Trap Catch

Aphid Alert Trap Catch for week ending June 28, 2013.

Friday July 05, 2013.

Here's the catch for the Trapping Period ending June 28, 2013.
** Soybean aphids found in Crookston, July 05!! **

All trap locations are now in, additional locations may be added in the next 2 weeks. Numbers of aphids trapped in catches for the first 3 weeks of the network have been low.  There were no aphids recovered in the first week (ending Jun 14). However, high populations of English grain aphid have been reported in small grains in southern and west central MN and in SE and east central ND.  In addition, on Friday, July 05, a colony of soybean aphids were found in Crookston.  This colony is no more than 4 days old.  These populations may indicate 2013 will become an aphid year.  Vigilant scouting for and management of aphids is advised.

Scouting for aphids in potatoes:
- select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
- avoid leaves on the ground or in contact with the soil.
- in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of insecticides an effective control for PVY.
- the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
- in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding.

Weekly Catch

Cumulative Seasonal Catch

June 28, 2013 Aphid Alert Trap Catch

Fri., June 28, 2013

Here's the catch for the Trapping Period ending June 21, 2013.

All trap locations are now in, additional locations may be added in the next 2 weeks. Numbers of aphids trapped in catches for the first 3 weeks of the network have been low.  There were no aphids recovered in the first week (ending Jun 14). However, high populations of English grain aphid have been reported in small grains in southern and west central MN and in SE and east central ND.  IN addition, soybean aphids have been reported colonizing volunteer soybeans in southern MN.  These populations may indicate 2013 will become an aphid year.  Vigilant scouting for and management of aphids is advised.

Scouting for aphids in potatoes:
- select leaves from the lower to mid canopy.  Lower, older leaves will have more established colonies and aphids prefer the balance of nutrients found here; aphids are rarely found on leaves in the upper canopy.
- avoid leaves on the ground or in contact with the soil.
- in seed potatoes there is only a threshold for PLRV (10 aphids/100 leaves), reactive application of insecticides an effective control for PVY.
- the use of feeding suppressing insecticides, such as Fulfill (Syngenta Crop Protection)  or Beleaf (FMC Corp.) and refined crop oils, such as Aphoil and JMS Stylet Oil, at or prior to field colonization by aphids may reduce the transmission of PVY within fields.
- in table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding.

Weekly Catch - click on image for full-size table

Cumulative Seasonal Catch - click on image for full-size table