Abstract
Abstract Experimental sprays were evaluated for control of STLM and possible deleterious effects on STLM parasitoids. The treatments were applied to nonreplicated 1.6-acre plots in The Dalles, OR, on a mixed planting of approximately 50-year old Bing, Black Republican, and Napoleon sweet cherry trees. The materials were applied on 14 Jul using an Orchardmaster sprayer with a 200 gpa output. Diazinon was applied on 23 Aug to 0.5 of the Vendex + Dimilin plot and the check plot to observe possible parasitoid disruption. STLM damage was assessed by counting both the sap-feeding and tissue-feeding mines in leaves removed from current season Napoleon shoots. Mine counts were taken from a proximal, distal and middle leaf from each of 45 shoots/plot. The same sampling procedure was used on 9 Sep but only tissue-feeding mines were counted. Apanteles sp. were trapped on Pherocon AM yellow stickey traps hung 6 ft high on the north side of trees for approximately 1 wk. A ratio of the average no. ol Apanteles sp. trapped, divided by tissue-feeding mines/leaf was calculated to determine parasitoid disruption from the sprays. Average monthly temperatures were: Jul 79.8°F, Aug 70.9°F, Sep 58.0°F. Monthly rainfall in inches was: Jul 0.02, Aug 0.29, Sep 0.43.
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