Western corn rootworm (Coleoptera: Chrysomelidae) larval control with chlorpyrifos applied at planting time versus a post-planting chemigation application to corn grown under two different tillage systems
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Published source details
Peters L.L. & Lowry S.R. (1991) Western corn rootworm (Coleoptera: Chrysomelidae) larval control with chlorpyrifos applied at planting time versus a post-planting chemigation application to corn grown under two different tillage systems. Journal of the Kansas Entomological Society, 64, 451-454.
Published source details Peters L.L. & Lowry S.R. (1991) Western corn rootworm (Coleoptera: Chrysomelidae) larval control with chlorpyrifos applied at planting time versus a post-planting chemigation application to corn grown under two different tillage systems. Journal of the Kansas Entomological Society, 64, 451-454.
Actions
This study is summarised as evidence for the following.
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Alter the timing of insecticide use Action Link |
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Alter the timing of insecticide use
A replicated study in 1987-1989 in Nebraska, USA (Peters & Lowry 1991) found similar root damage from western corn rootworm Diabrotica virgifera larvae in plots receiving insecticide before planting (average damage rating of 4.2) and plots receiving insecticide after planting (rating of 3.8). Maize Zea mays yields were also similar between plots treated before (10.5 t/ha) and after (10.9 t/ha) planting. Treatment prior to planting comprised chlorpyrifos granules applied at 34 g/1000 ft (304.8 m) of row. Treatment after planting was timed to correspond with corn rootworm egg hatch and early larval development and comprised chlorpyrifos emulsion at 1.12 kg/ha. Treatments were tested in 48.8 m² plots replicated four times. Root damage was scored from 1-6 with 1 being minor feeding damage and 6 equalling three or more root nodes destroyed/plant. Yields were assessed by hand harvesting two 20 ft (6.1 m) lengths of row in each plot.
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