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(D3) HAZELNUT: Corylus avellana L., ‘Barcelona’ CONTROL OF FILBERT LEAFROLLER WITH SPINOSAD, MVPII BT, AND CHLORPYRIFOS IN SPRING, 1999 Robert Progar Forest Health Protection 1249 S. Vinnell Way Suite 200 Boise, ID 83709 Phone: (208) 373-4226 Fax: (208) 373-4111 E-mail: rprogar@fs.fed.us European leafroller (EL): Archips rosanus (L.) Spinosad, MVPII BT, Lorsban 4E, and Lorsban 75WG were evaluated for their efficacy to control EL on hazelnuts in western Oregon. The test was conducted in a large nonbearing hazelnut orchard of small trees (15-20 ft) on a 20-ft grid in Deaver Conner, OR, by replicating six treatments in a CRD. The orchard had experienced high EL populations in previous years. A replicate consisted of an individual tree, with 16 trees in each treatment. Treatments were applied on 23 Apr with a hand held wand to the point of drip (approximately 1 gal/tree) using a Rears Nifty-fifty sprayer at 40 psi pressure. Treatments were targeted toward first- and second-instar larvae. Pretreatment counts were made during the weeks of 12 and 19 Apr, and posttreatment counts were made 15-19 May. All evaluations were conducted by counting the number of EL larvae on 30 branch terminals of each tree. Pretreatment counts averaged 8-14 larvae per tree. The trees treated with Lorsban 75WG had significantly higher pretreatment numbers of EL larvae than the other treatments. Posttreatment counts show that Spinosad at 10 or 6 oz/acre were as effective as either formulation of Lorsban in controlling leafroller populations. MVPII BT reduced populations by 50% of the untreated check. The two rates of Spinosad were not significantly different from each other nor were the two different formulations of Lorsban.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2001
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