Mortality in eggs of pear psylla (Homoptera: Psyllidae) caused by fenoxycarb in combination with a water drench
Abstract
Applications of the insect growth regulator fenoxycarb in pear before the appearance of foliage kills the eggs of pear psylla, Cacopsylla pyricola (Foerster), laid on newly expanded foliage 4 weeks after the application. We hypothesized that water in the form of rainfall or overhead irrigation transports the product from sprayed wood onto new foliage in sufficient amounts that eggs on foliage are killed. We tested this hypothesis by covering fenoxycarb-sprayed limbs with waterproof plastic, removing the covers 4 weeks later, immediately drenching half of the limbs with water, and then comparing egg hatch on drenched and non-drenched limbs. We also monitored egg hatch on uncovered limbs. Egg mortality 4 weeks after the application was two-fold higher on limbs drenched with water than on covered, non-drenched limbs (52% vs 26%). Mortality on limbs without fenoxycarb was less than 10%. Eggs deposited on fenoxycarb-treated but uncovered limbs also showed high rates of mortality (33-44%), which may have been due to rainfall in mid-April transporting fenoxycarb onto foliage.
Key words: pear psylla; insect growth regulators; Yakima Washington
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