APHIDS:  Aphids were found in 67% of the fields we monitored this week, and they were almost all wingless green peach aphids. Potato fields averaged 1.1 aphids per plant and ranged from 0 to 18 aphids per plant.  Continue to scout fields for aphids and try not to let populations of wingless aphids get out of hand.  

APHIDS:  We found aphids in 53% of the fields we monitored this week. Wingless green peach aphids were found in 43% of the fields (up from 22% last week). Continue to scout fields for aphids and try not to let populations of wingless aphids get out of hand. 

APHIDS:  We found aphids in 53% of the fields we monitored this week. Wingless green peach aphids were found in 22% of the fields. Continue to scout fields for aphids and try not to let populations of wingless aphids get out of hand. Expect to find wingless aphids when nearby potato, wheat, alfalfa, etc. fields are harvested.    

APHIDS:  Aphid numbers were very similar to last week. We found aphids in 85% of the fields we monitored this week. Wingless green peach aphids were found in 48% of the fields. Aphids, especially green peach aphids and potato aphids, are important pests of potatoes because they spread potato viruses (especially Potato Virus Y and Potato Leafroll Virus). They can also cause significant feeding-damage if their numbers are large.

?PYRETHROID INSECTICIDES ARE DISCOURAGED MID-LATE SEASON:  The use of pyrethroid insecticides is discouraged between June 15 and a few weeks before harvest because they almost always result in a later flare up of aphids (and/or psyllids, mites, and thrips). Pyrethroids are broad-spectrum insecticides. In addition to controlling aphids, they kill a lot of the beneficial insect predators (ladybird beetles, big-eyed bugs, damsel bugs, minute pirate bugs, and others) that help to keep aphid numbers in check. This often results in bigger problems with aphids later in the season. Instead, we recommend using insecticides that are more selective in their activity.  

APHIDS: We found aphids in 83% of the fields we monitored this week; some were migratory with wings, and some were wingless aphids colonizing the field. Wingless green peach aphids were found in 53% of the fields (up from 36% last week). Aphids, especially green peach aphids and potato aphids, are an important pest of potatoes because they spread potato viruses (especially Potato Virus Y and Potato Leafroll Virus). They can also cause significant feeding-damage if their numbers are large.   

APHIDS:  Aphids were found in most of the fields we monitored this week (78%); some of these aphids were migratory with wings, and some were wingless aphids colonizing the field. Wingless green peach aphids were found in 36% of the fields (down from 71% last week). It is important to keep a close eye on these wingless aphid colonies in potatoes because they can grow exponentially (10-25 generations in a season). Large populations can be very difficult to control and may result in the early senescence of the crop.  

APHIDS:  Aphids were found in most of the fields we monitored this week (83%). Last week, most of the aphids were winged, migratory aphids moving around the Basin. This week, we found both winged and wingless aphids in most fields.  Wingless green peach aphids were found in 71% of the fields (up from 43% of the fields last week). The green peach aphids will colonize the field, so you will want to do what you can to prevent these aphids from getting out of control. In addition to spreading potato viruses, green peach aphid popultations can become very large and their feeding can result in the early senescence of potato crops.

APHIDS: There was an increase in the number of aphids in potato fields this week, and we found them almost everywhere (87% of the fields we monitored). Most were winged aphids of several different species. Of these, only the green peach aphids and potato aphids will colonize potato fields -- the rest are just passing through. Unfortunately, even some of the aphids that are only passing through can spread viruses if they probe an infected potato and then taste a few more potatoes before moving on. We also found wingless green peach aphids in 43% of the fields. These were mainly in the Lower Columbia Basin south of Connell. 

APHIDS:  Aphids were found in 52% of the fields we monitored this week. Most of these were winged aphids on the move, but 17% of the fields had some wingless green peach aphids settling in for the long term. Potato fields that were NOT treated with a systemic insecticide at planting or hilling are most at risk of becoming infested with aphids in May and June. Early-planted potatoes that were treated with a systemic insecticide may no longer be protected. These insecticides are thought to provide about 60-80 days of control. 

APHIDS:  Aphids were found in 44% of the fields we monitored this week. Most of these were winged aphids on the move, but 16% of the fields had some wingless green peach aphids settling in for the long term.  Potato fields that were NOT treated with a systemic insecticide at planting or hilling are most at risk of becoming infested with aphids in May and June. Early-planted potatoes that were treated with a systemic insecticide may no longer be protected. 

APHIDS: Aphids were found in 26% of the fields we monitored this week; some were winged aphids on the move, and some were wingless green peach aphids settling in for the long term. Potato fields that were not treated with a systemic insecticide at planting or hilling are most at risk of becoming infested with aphids in May and June. Early-planted potatoes that were treated with a systemic insecticide may no longer be protected. These fields should be monitored closely for aphid infestations. In our experience, it is important to detect green peach aphid infestations early. A single insecticide application when aphid densities are low (less than 1 per plant) can get the job done, but major infestations usually require repeat applications. Green peach aphid populations in potatoes can experience exponential growth and become very large - building up to hundreds of aphids per plant. Large infestations of green peach aphids can result in the early senescence of the crop.