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Downloaded from https://academic.oup.com/amt/article-abstract/22/1/85/4639916 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 85 BEAN: Phaseolus vulgaris L. 'Pinto, N W 590 ' Robert L. Stoltz (4E) Western Bean Cutworm; Loxigrotis albicosta (Smith) Nancy A. Matteson University of Idaho Twin Falls R & E Center Twin Falls, ID 83301 (208) 736-3600 WESTERN BEAN CUTWORM CONTROL IN DR Y BEAN S WITH FOLIAR SPRAYS, 1996: Experimental plots were established on the UI Research and Extension Center, Kimberly, Idaho. Beans were planted 31 May and furrow irrigated. The soil type was Portneuf silt loam. Eight treat ments and one untreated check were replicated four times in a RC B design. Each plot was 6 rows by 25 ft long. Western bean cutworm larvae were reared from egg masses in laboratory petri plates on garden bean leaves. Approximately 100 1st and 2nd instar larvae per plot were released on 26 Jul and 100 larvae again on 29 Jul by placing bean leaflet sections containing larvae within the plant canopy on randomly selected plants in the center two plot rows. All treatments were applied on 6 Aug , a second application of both Bt formulations on 12 Aug , and a third application of both Bt formulations on 19 Aug. A broadcast S was applied with a backpack, C0 sprayer at a rate of 20 gpa (30 psi; 4, 10X hollow cone nozzles). On 27-28 Aug, pods were collected from the center two plot rows. These pods were inspected for damage and percentages of damaged pods and seeds per treatment were determined. Data were analyzed using ANOVA and Newman-Keul's multiple means comparison (P = .05). There was a significant reduction in both the amt of damaged pods and damaged seed with both the Asana and Spinosad treatments. No significant reduction in damage was observed in any of the Bt treatments (Javelin and Condor) from the untreated check, but a slight reduction in seed damage was observed with Javelin at two and three applications compared with a single application. Percent damage Treatment/ formulation Rate Pods Seed Untreated Check 6.01b 1.38b Javelin 1 application 1 lb FP/acre 6.58b 1.63b Javelin 2 applications 1 lb FP/acre 4.74b 1.08ab Javelin 3 applications 1 lb FP/acre 5.51b 1.02ab Condor 1 application 1 pt FP/acre 9.49b 2.45b Condor 2 applications 1 pt FP/acre 8.31b 2.17b Condor 3 applications 1 pt FP/acre 5.48b 1.43b Asana 0.05 lb(AI)/acre 0.24a 0.00a Spinosad 100.00 g (AI)/ha 0.83a 0.005a Means within a column followed by the same letter are not significantly different (P = 0.05; Student-Newman-Keuls). BROCCOLI: Brassica oleracea botrytis L. 'Premium Crop' Mohammed Al-Doghairi, Whitney (5E) Western black flea beetle: Phyllotreta pusilla Horn Cranshaw, D. Casey Sclar, Dan Gerace, and Andrea Tupy Department of Bioagricultural Sciences and Pest Management Colorado State University Ft. Collins, C O 80523 (970)491-6781 EVALUATION OF VARIOU S REPELLENTS FOR CONTRO L OF FLE A BEETLE ON BROCCOLI , 1996: Broccoli (cv. Premium Crop) was planted on 13 Ma y 1996 at the Horticulture Field Research Center in Ft. Collins , CO . Plots consisted of single 10 ft long rows with 15 in. in-row spac ing, arranged in RC B design with six replications. Each plot consisted of 8 plants. Repellent treatments were applied on 20 and 30 May, and 3 and 24 June with hand-held sprayers. Plants were sprayed to the point of drip delivering a spray volume of approximately 167 ml for each plot. Insect counts were made on 21 and 31 May 4 , 6, 11, 20 , 24 , and 28 Jun, and 1 and 11 Jul by whole plant examination of 4 plants in the center of each plot. All repellents tested provided some suppression of flea beetles. Margosan-O and Sunspray oil showed the largest reduction in the second and third sampling period after each application. Sunspray oil provided suppression of beetle numbers for three weeks after the third application, while Margosan- 0 suppressed beetles for two weeks only. Guardian failed to suppress beetle numbers following the third application. Mean no. flea beetles/4 plants" Rate Treatment 21 May 31 May 4 June 6 June 11 June 20 June 24 June 28 June 1 July 11 July amt/acre 62.17a 42.67a 48.83a 27.00a 6.50a Water Check 1.83a 15.67a 22.33a 15.83ab 36.33a Margosan-O 0.00b 8.67b 3.50b 7.50b 56.83a 4.67c 46.50a 29.83a 22.83a 4.67a 1:150 v:v SunSpray Oil 2.00a 5.33b 6.67b 7.17b 55.17a 3.83c 8.17b 20.33a 13.17a 5.17a 2% v:v Guardian 1.16ab 8.00ab 24.00a 19.17a 66.50a 27.67b 58.67a 33.50a 21.33a 7.67a 10% v:v Means within a column followed by the same letter are not significantly different (P • 0.05) by SNK. "All dates are 1996.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 1997
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