Hello, What are the best ways to stop pea weavils on peas? I would prefer organic methods if they yield results. Thank you so much!
Josephine County Oregon
Hi, There is the Pea Leaf Weevil (causes damage to the leaf) and the Pea Weevil that damages the pea. The information below is regarding the latter. I've attached some photo links to confirm you have identified the pest as the pea weevil. There is some cultural control to minimize some of the damage, but no specific organic methods that are listed that are research based and shown to work. I did include the chemical controls also, unfortunately none of them are derived organically. If you want to know more about the chemical controls you can go to: http://npic.orst.edu/ingred/bifenthrin.html
Pictures of the pea weevil:
This information is taken from the PNW Insect Management Handbook at http://uspest.org/pnw/insects?22VGTB47.dat
Bruchus pisorum) ID photos: fact page (pdf):
Biology and life history Adults overwinter with peas primarily in storage but also in the field. The pea weevil emerges about when peas are blooming, feeding on flowers (pollen and petal), leaves, or pods. The elongated yellow eggs are laid on the outside of the pod singly or in pairs. Although one to a dozen eggs are laid per pod, only one larva develops per pea. Hatching is in 1 to 3 weeks. The larva burrows through into the pea and matures in 5 to 6 weeks. Infested peas “heat,” aiding larval development. Pupation takes about 2 weeks, late in summer. Adults may leave the pea immediately or stay inside it all winter. There is only one generation per year.
Scouting and thresholds One weevil in 25 sweeps may result in 10% infested peas at harvest. Take samples along field margins, fence rows, and in the field. The most conservative approach is to apply appropriate insecticides at bloom prior to detecting adult pea weevils.
Management—chemical control: HOME USE
2. carbaryl—Do not apply to plants in bloom.
Thanks, Amy Jo