Trap Catches Identified to July 11.
Here are the trap catches from the sites we received up to July 11. Note that sites
are on different schedules to send in trap catches (spreading out our
identification workload). As more sites come in, we'll identify their
trap catch and update the site on the fly.
We're getting vectors at a few more locations but still seeing low
numbers. Nine of the sites from which we received trap catches had at
least one aphid vector. High counts were at our Linton sites with three
and four vectors. Ada, Erskine, Forest River, Hallock, Hoople,
Langdon, and Staples collected no vectors.
Species captured include buckthorn, bird-cherry oat, green bug,
english grain, sunflower, cowpea, and pea aphids. These are all medium
Until next week…
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.
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
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.