Pea Weevil Bruchus Pisorum (L.), the Pea Weevil, Is Not a True Weevil, but Is a Serious Pest of Pea Crops

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Pea Weevil Bruchus Pisorum (L.), the Pea Weevil, Is Not a True Weevil, but Is a Serious Pest of Pea Crops

Western Triangle Ag Research Center 9546 Old Shelby Rd, P.O. Box 656, Conrad, MT 59425; Contact: (406) 278-7707 Pea weevil Bruchus pisorum (L.), the pea weevil, is not a true weevil, but is a serious pest of pea crops. Adults lay eggs in the developing pea in the field, but larvae complete development in the grain bin. For this reason the pea weevil is strictly speaking not a stored grain pest, though most of its damage is caused while it is in the bin. Larvae excavate the center of the pea and construct a circular Figure 1. a) Pea weevil adult, larvae and damage to exit hole (Figure 1). Damage from this peas. insect is most often discovered at the Control elevator. Up to 70% of grain weight loss Sheep may be used to graze out crop occurs in the storage bin due to residues, either eating the larvae from continued larval feeding. shattered pods or exposing them to direct The adult pea weevil can be surveyed in sunlight. Chemical control may be used the field using a sweep net. Adults are for the adults when they are in flight. thick brown beetles with white spots on Threshold for spraying is 2 beetles/25 the elytra. The abdomen extends beyond sweeps (Dun) & 1 beetle/25 sweeps the elytra and has white tips. The adults (White). are measure 5mm in length. Research Assessing This is a new pest in Montana. WTARC Sweep netting for adults in the is investigating monitoring methodologies summer after peas flower is a good to assess the presence and extent of pea way to survey populations. Beetles are weevil in Montana. As more information more common near field borders. accumulates about this pest control programs will be initiated. College of Agriculture & Montana Agricultural Experiment Station 8/13/2015.

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