Abstract:A sequential decision plan, based on the negative binomial distribution and providing for two infestation classes, has been derived for use in management of the alfalfa blotch leafminer, Agromyza frontella (Rond.), in southern Ontario. It utilizes counts of the eggs in leaflets of alfalfa, and in economic situations will provide growers with sufficient lead time to consider alternative action strategies. An appraisal of the plan by field scouts showed that it rated the infestation status of the leafminer corre… Show more
“…Two funnels on either side of a plant were positioned the first week of July in corn following soybean rotation (24 funnels at North Gower and 32 at Ottawa) and in soybean following corn rotation at Winchester and Ottawa (24 funnels each). To drown the adults, ethylene glycol was poured into the lid of each jar (Harcourt 1982). Traps were inspected twice each week and all adult rootworms were removed.…”
Section: Methodsmentioning
confidence: 99%
“…To collect adults emerging from the soil, a funnel-emergence trap was used (Harcourt 1982). Funnels (0.037 m 2 ) were pushed into the ground over the root zone.…”
The western corn rootworm (WCR), (Diabrotica virgifera virgifera LeConte), was collected in eastern Ontario and western Quebec in 2000. At Ottawa and North Gower, WCR adults were recovered using emergence traps from first-year corn and, at Ottawa, from first year soybean after corn. This constitutes an extension of the species distribution and the first report of WCR developing in soybean in Canada. Key words: Western corn rootworm, Diabrotica virgifera virgifera, distribution, corn, soybean
“…Two funnels on either side of a plant were positioned the first week of July in corn following soybean rotation (24 funnels at North Gower and 32 at Ottawa) and in soybean following corn rotation at Winchester and Ottawa (24 funnels each). To drown the adults, ethylene glycol was poured into the lid of each jar (Harcourt 1982). Traps were inspected twice each week and all adult rootworms were removed.…”
Section: Methodsmentioning
confidence: 99%
“…To collect adults emerging from the soil, a funnel-emergence trap was used (Harcourt 1982). Funnels (0.037 m 2 ) were pushed into the ground over the root zone.…”
The western corn rootworm (WCR), (Diabrotica virgifera virgifera LeConte), was collected in eastern Ontario and western Quebec in 2000. At Ottawa and North Gower, WCR adults were recovered using emergence traps from first-year corn and, at Ottawa, from first year soybean after corn. This constitutes an extension of the species distribution and the first report of WCR developing in soybean in Canada. Key words: Western corn rootworm, Diabrotica virgifera virgifera, distribution, corn, soybean
The dispersion of the bluegreen aphid Acyrthosipon kondoi Shinji in lucerne conformed to the negative binomial distribution and a high degree of contagion was evident from aggregation indices. These data were used, together with proposed treatement thresholds, to develop and test sequential sampling plans for this aphid based on a single stem sampling unit. Four plans, accounting for variations in plant growth stage and varietal susceptibility to A. kondoi were computed at 2 treatment threshold levels. One of these plans was tested on 3 lucerne varieties in the field. Treatments made on plan recommendations restricted yield losses to within expected limits.
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