A SEQUENTIAL DECISION PLAN FOR MANAGEMENT OF THE ALFALFA BLOTCH LEAFMINER, AGROMYZA FRONTELLA (DIPTERA: AGROMYZIDAE)

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 correctly in 48 of 51 cases. Sampling time averaged 25 min per scout per field.

Eastward expansion and discovery of the soybean biotype of western corn rootworm (Diabrotica virgifera virgifera LeConte) in Canada

“…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.…”

“…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.…”