A Pea Leaf Weevils is an insect that feeds on the roots (larvae) and leaves (adult) of peas, fababeans and dry beans. In southern Alberta peas are the major crop at risk for damage. Most of the damage occurs from the larvae feeding on the nitrogen-fixing nodules, adults chewing on the leaves and growing points can also cause extreme damage.
The adult is slender, grayish-brown and about 5mm long. Pea Leaf Weevils can be distinguished by the three light-colored stripes extending lengthwise down its body. The larvae are “C” shaped, light milky white in color with a dark brown head, legless, cylindrical, soft and fleshy and 3.5-5.5mm in length.
Under Alberta conditions, the Pea Leaf Weevils produce one generation per year. Adult Pea Leaf Weevils overwinter in alfalfa. In the spring, Pea Leaf Weevils moves either by flying or walking short distances. The females lay 1000-1500 eggs in the soil near or on developing plants in May through June. Upon hatching the larvae move to the nodules where they feed.
Foliar application of insecticide is recommended if there are 1-2 bite marks per plant. This being said, please scout your pea fields or give us a call and we can come at check them for you.
From Amanda Homans, Agronomist with McRae Holdings.