Bergen, Jeannette R.

Chamberlain, Jim D.

Shanks, Carl H., Jr.

Tanigoshi, Lynell K.

Undetermined

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Section VI.Soil ArthropodsROOT WEEVIL CONTROL ON RED RASPBERRY, 1995L. K. Tanigoshi, C. H. Shanks, J. D. Chamberlain & J. R. BergenWashington State UniversityVancouver Research & Extension UnitVancouver, WA 98665-9752360/576-6030Trial 1: Trial were conducted in a mature field of 'Chilliwack' red raspberries in Vancouver, WA.Treatments were replicated 4 times to 9 x 600 ft plots in a RCB design. Sprays were applied on 27July over rows with a hooded boom sprayer equipped with 13 hollow cone D4-45 TeeJet nozzles at250 psi that delivered 180 gal/acre at 3 mph. AC 303,630 (Alert), fipronyl (Regent) and bifenthrin(Brigade) were evaluated for field efficacy to control a mixed population of black vine weevil,Otiorhynchus sulcatus (98%), strawberry root weevil, O.ovatus (1%) and obscure root weevil, 'Sciopithes obscurus (1%).All treatments were significantly better than the untreated check. Brigade gave excellentknockdown of adult weevils followed by the two rates of fipronyl. Average counts for primarilyblack vine weevil in AC 303,630 treated plots were over 10- and 8.5-fold those observed forBrigade.Trial 2: Treatments were replicated 4 times on 9 x 30 ft plots in a RCB design in a mature fieldof 'Meeker' red raspberries in Aurora, OR. Treatments were applied on 28 June using a 5 fthand-held upright boom with 6 D3-25 TeeJet nozzles at 120 psi that delivered 100 gal/acre at 2mphwhen both sides of the rowwere sprayed. Air temperature was 78 °F and E wind 3-5 mph.Counts were made on 30 June beginning at 10 PM by placing 20 ft long x 4 ft wide strips ofwhite plastic sheets under each side of the row. The top training wire was vigorously shaken 10times at 2 locations one-third of the way in from each end of the plastic strip. Obscure rootweevils were counted with the aid of a flashlight.The treated plots all had between 0-7% as many weevils as the untreated plots.63Table 1. Control of black vine weevil, strawberry root weevil and obscure rootweevil, Vancouver, WA, 1995.Treatment Rate lb (AI)/acre Mean weevils/plot*107.5b85.0bc57.3bcd38.3cd10.3d211.0a*Means within columns followed by the same letter are not significantlydifferent (P = 0.05; LSD).DAC 303,630 2SC 0.16AC 303,630 2SC 0.32Fipronyl 80WG 0.02Fipronyl 80WG 0.04Brigade 10WP 0.10Check n/aTable 2. Control of obscure root weevil, Aurora, OR, 1995.Jr Treatment Rate lb(AI)/acre Mean weevils/plot*AC 303,630 2SC 0.16 0.5a{ AC 303,630 2SC 0.32 0.0aFipronyl 80WG 0.02 0.3afV Fipronyl 80WG 0.04 0.3av' Brigade 10WP 0.10 0.0aCheck n/a 7.0b* Means separation by Tukey's HSD test (F^= 0.05).64

Root Weevil Control on Red Raspberry, 1995

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Root Weevil Control on Red Raspberry, 1995

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