Abstract
SummaryThe effects of five burning treatments of alfalfa (Medicago sativa L.) stubble combined with two insecticide treatments on populations of alfalfa weevil, Hypera postica (Gyllenhal), and the pea aphid, Acyrthosiphon pisum (Harris) were evaluated over an eight year period. The effects of the burn treatments were dependent on insect species, time of burn and year. Immature alfalfa weevil population levels were significantly reduced by the burn‐every‐autumn treatment in 3 of the 8 years, in 2 out of 8 years by the burn‐e very‐spring treatment, and by the alternate‐year‐burn treatment in 1 out of 4 years. Burning had little or no effect on pea aphid populations.
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