. Agricultural plant pest control : a study manual for commercial and governmental pesticide applicators . Weeds; Pests. Strawberry root weevil larva (top) and adult female. They begin to depost their eggs in about 2 weeks around the bases of the plants. There is one generation per year. Damage: The larval stage of this insect causes damage to mint by feeding on the roots. Habitat: The strawberry root weevil feeds on many different crop roots including mint, straw- berry, blueberry, and others. Control: Sampling for this pest is generally done in late August and September or the fol- lowing sp
. Agricultural plant pest control : a study manual for commercial and governmental pesticide applicators . Weeds; Pests. Strawberry root weevil larva (top) and adult female. They begin to depost their eggs in about 2 weeks around the bases of the plants. There is one generation per year. Damage: The larval stage of this insect causes damage to mint by feeding on the roots. Habitat: The strawberry root weevil feeds on many different crop roots including mint, straw- berry, blueberry, and others. Control: Sampling for this pest is generally done in late August and September or the fol- lowing spring in March, April, or early May. Take at least 25 soil samples from different ar- eas of the field (one site per 2 1/2 acres), screen the soil, count the number of larvae and calcu- late the average number per sample. If the aver- age number of root weevil larvae exceeds 2 per sample, treatment of adults is recommended. When sampling for adults, one should use a sweep net in the evening a couple of hours after sunset. Still, warm and dry evenings are the best. Windy, cool and/or rainy periods produce fewer weevils per sweep, giving the impression of a smaller field population than is actually present. Take 10 sweep samples in at least 5 different sites in fields up to 30 acres. Add one additional sample site for each additional 10 acres. There is not a treatment threshold for adult weevils, but once an infestation becomes estab- lished in a field, it can be difficult to control. An evening insecticide application against adults may be justified even if the population is at a rela- tively low level. Ideally, this measure is timed after 90 to 100 percent of the adults have emerged and prior to egg laying in June or early July. Weevils will not have mature eggs in their bodies until about 2 weeks after emergence. If one sprays too late, egg laying will have already occurred. Two applications may be necessary in some cases. A parasitic nematode is labeled for control of strawber
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