Trap Catches to July 1-7, 2023.
Aphids are starting to be captured but numbers are still low; only 4 aphids were returned from traps, and only 3 were PVY vectors. So, still a slow start to the aphid season and I'm still not complaining. We'll see more traps reporting in the near future as the season winds up. So check back to check on the numbers.
In the meantime, Have a great weekend.
You keep scouting and we'll keep counting.
Scouting for aphids in potatoes:
- Select leaves from the lower to mid canopy. Start at the edge of the field.
- 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 pymetrozine (Fulfill®) or flonicamid (Beleaf®) 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. Some other insecticides, such as clothianidin (Belay®), imidacloprid (Admire Pro® or Provado®), and spirotetramat (Movento®), have also been demonstrated to reduce the transmission of PVY.
- In table stock potatoes, a treatment threshold of 30 aphids /100 leaves should deter yield loss due to aphid feeding.
Click on any image below for full-scale version.
Cumulative PVY Vector Risk Index to 7/7/2023
Aphid Species Capture and PVY Vector Risk Index for the week ending 7/7/2023
Cumulative Aphid Species Capture and PVY Vector Risk Index to 7/7/2023
