Biology Impact during threshing Yield can be reduced by up to15 in heavy infestationsAt the time of harvest 13 seed moisture contentthe pea weevil larvae are generally still immature andhave onl ID: 215528
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Biology cracks and crevices of fence posts. The adultspea flowers. They can fly up to 5 km attracted byseasons. Irrespective of how far the beetles fly toreach the crop, their movement within a floweringcrop is generally restricted to the crops edge.leave hibernation and first arrive in the pea crop.the females lay eggs on the developing pods. Thisdelay in egg laying should be taken into accountEggs hatch in about 14 -28 days and bore directlyfrom the egg, through the pod wall and into thedeveloping seed. For this reason the adult peaweevil must be controlled prior to egg laying asinsecticides are ineffective against the larvae. Afterlarvae prepares a 2-3 mm exit hole by chewingpartly through the seed coat. The larvae thenadult beetle. By this time the seed has generallybeen harvested and some beetles will emerge fromthe seeds to find suitable hibernation sites. The Impact during threshing. Yield can be reduced by up to15% in heavy infestations.At the time of harvest (13% seed moisture content)the pea weevil larvae are generally still immature andhave only completed 20 to 30% of their feeding.harvest, prevents further seed weight (yield) loss.also effect sprouting percentages. Grain withalso can be non-viable or produce weak seedlings. Monitoring The only effective way to determineTake 25 sweeps along a 1 5 m band around theedges of the crop, concentrating adjacent to trees orother structures. Repeat this at six or more sites onfound, also monitor around trees within the crop. Management program A whole farm management program is the best Sowing seed should be free of live adult beetles.If using farmer kept seed fumigate straight afterharvest. When purchasing seed, ensure it has been Harvest on time to minimise yield loss, andhibernation sites. Clean up spilled seed in paddocks and aroundstorage sites. High population Pea weevil unlikely TreesPea weevil numbers will be highest around the edgesof the paddock and around trees, and negligible in the centre.