Biology and Control of the Obliquebanded Leafroller on Apples12

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Abstract
Both the overwintering and 1st-generation larvae of Choristoneura rosaceana (Harris) caused severe damage to apples at harvest. Most damage from overwintering larvae occurred after petal fall during late May and June, and the 1st-generation larvae injured fruit during late July and Aug. PENNCAP-M (methyl parathion) and methomyl applied at petal fall and in mid- to late July controlled the larger overwintering and 1st generation larvae and effectively reduced fruit damage. Azinphosemethyl, phosmet, and PENNCAP-M applied during the 1st adult flight also controlled newly emerging 1st generation larvae and reduced fruit damage. Pheromone traps and an equation driven by avg daily temperature to estimate egg hatch were used to effectively time these sprays.

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