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The mortality of elm leaf beetle larvae to foliar-applied insecticides sprayed on different dates was assessed. Four different insecticides were examined for differences in performance. Siberian elm foliage was treated with foliar-applied insecticides on each of 4 different dates. Treatments were applied with a pump-mister sprayer to the point of run-off. All foliage was collected and bagged on 17 July. In the laboratory, 10 larvae were placed in a petri dish and treated foliage was introduced for consumption. Mortality was assessed at 24 and 72 h after exposure by counting the number of dead, live, moribund and pupated larvae present in a petri dish at a given time interval. Only dead larvae were used to calculate percent mortality estimates. The experiment was analyzed as a CRD with 10 replications per treatment.

Persistence of Foliar-Applied Insecticides for Elm Leaf Beetle Control, Trial One, 1995