Abstract
Abstract Eight treatments were applied to evaluate control of pine root collar weevil on heavily infested 8-14 ft Austrian pine Christmas trees. Individual treatments were applied to 4 tree replicates after the duff below each tree was removed and bare ground was exposed. Two applications of each treatment were made as follows: the first application was completed on 31 May with a hand held pump sprayer under the following conditions: clear skies; air temperature, 92°F; water pH, 5.0; and RH, 50%. The second application was completed on 5 Sep with a C02 sprayer with one 8004VS Tee Jet nozzle mounted on the end of a 24 inch boom operating at 24 psi under the following conditions: partly cloudy skies; air temperature, 90°F; water pH, 7.0; and RH, 35%. Treatments were applied to the base of each tree at the rate of one qt/replicate. Each tree was dug and burlapped at the field site on 24 Oct, and returned to the laboratory. Each tree was thoroughly examined by removing all the bark from the root collar areas and lateral roots to record the presence of larvae. Plus, the soil ball was examined for the presence of larvae.
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