Abstract
Abstract Three treatments were applied to evaluate control of Cooley spruce gall adelgid on heavily infested 6-8 ft Douglas-fir Christmas trees. Treatments were applied on 10 May and arranged in a randomized complete block design. Each treatment was replicated four times. Foliar treatments were completed by using a Solo Master 412 back pack mist blower operating at full throttle on setting two. Treatments were applied at the rate of 150 gal/acre (454 ml/tree). At treatment time the following conditions existed: air temperature, 84°F; water pH, 7.0; 65% RH, and skies were clear. Posttreatment counts were completed on 21 May. Each treatment was evaluated by selecting four cardinal locations on each tree at breast height, counting 25 needles (1993 growth) at each location, and recording those needles infested with mature female adelgids and egg masses. Each tree was rated to determine the effect of treatment on tree quality on 14 Jul.
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