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CONTROL OF COLORADO POTATO BEETLE ON POTATOES USING FOLIAR INSECTICIDES, 2002

CONTROL OF COLORADO POTATO BEETLE ON POTATOES USING FOLIAR INSECTICIDES, 2002 (E50) POTATO: Solanum tuberosum L., 'Red La Soda' CONTROL OF COLORADO POTATO BEETLE ON POTATOES USING FOLIAR INSECTICIDES, 2002 Jeffrey A. Davis Department of Entomology University of Minnesota 1980 Folwell Avenue, Room 219 St Paul, MN 55108 Tel: (612) 624-2751 Fax: (612) 625-5299 davis271@tc.umn.edu Edward B. Radcliffe David W. Ragsdale Colorado potato beetle (CPB): Leptinotarsa decemlineata (Say) Insecticide trials were conducted at the University of Minnesota Agricultural Experiment Station at Rosemount, MN. 'Red La Soda' potatoes were planted on 20 and 21 May at a rate of 20 bags/acre or 19,000 plants/acre. Plots were four rows wide, 50 ft long, with 36 inch between rows and 12 inch between plants. To limit the movement of beetles, plots were separated by 35 ft x 6 ft of cultivated soil. Treatments were arranged in a randomized complete block design with four replications. All plots received a weekly application of the fungicide Bravo ZN at a rate of 1-2 pt/acre for late blight control. Insecticide trials we performed focused on the first generation Colorado potato beetle (CPB) larvae. Egg hatch was 100% when the insecticide spray application was made on 1 July. Pre-treatment counts of small larvae (1st and 2nd instars) and large larvae (3rd instars) were made on 10 plants per plot on 1 Jul. Applications were made on 1 Jul with a CO sprayer with T-jet nozzles, a carrier volume of 30 gpa, a spray pressure of 45 psi and a ground speed of 3.5 mph. Nozzles were spaced evenly across four rows on 18" centers and the boom adjusted in height so that there was 100% overlap 12 inches below the top of the canopy. The weather conditions for the day were zero precipitation, a wind speed of less than 5 mph, a maximum temperature of 95°F and a minimum temperature of 76°F. Post-treatment counts of small and large larvae were made on 10 plants per plot on the 3, 8, and 15 Jul. Percent defoliation for each plot was estimated on 15 and 22 Jul. Percent control was calculated as (1 - (treatment count/untreated control count)) x 100 for that day. ANOVA was performed following transformation of count and percentage data using log (x+1) and arcsin Ö (x), respectively. The level of significance was set at P = 0.05 and the Ryan-Einot-Gabriel-Welsch Multiple Range Test was used to separate means. Results are reported in Tables 1, 2, and 3. In general, foliar treatments were effective in CPB control. Colorado beetle pressure was normal for the year. SpinTor 2SC proved to be the most effective in controlling small larvae 14 days after treatment. For large larvae, SpinTor 2SC and Actara 25WG proved the most effective. Actara 25WG, SpinTor 2SC and Provado 1.6F kept defoliation under 25%. Steward 1.25SC was applied in error instead of Avaunt and proved relatively effective in controlling small larvae, although the rate applied was only one-third the rate recommended for that product. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF COLORADO POTATO BEETLE ON POTATOES USING FOLIAR INSECTICIDES, 2002

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10.1093/amt/28.1.E50
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Abstract

(E50) POTATO: Solanum tuberosum L., 'Red La Soda' CONTROL OF COLORADO POTATO BEETLE ON POTATOES USING FOLIAR INSECTICIDES, 2002 Jeffrey A. Davis Department of Entomology University of Minnesota 1980 Folwell Avenue, Room 219 St Paul, MN 55108 Tel: (612) 624-2751 Fax: (612) 625-5299 davis271@tc.umn.edu Edward B. Radcliffe David W. Ragsdale Colorado potato beetle (CPB): Leptinotarsa decemlineata (Say) Insecticide trials were conducted at the University of Minnesota Agricultural Experiment Station at Rosemount, MN. 'Red La Soda' potatoes were planted on 20 and 21 May at a rate of 20 bags/acre or 19,000 plants/acre. Plots were four rows wide, 50 ft long, with 36 inch between rows and 12 inch between plants. To limit the movement of beetles, plots were separated by 35 ft x 6 ft of cultivated soil. Treatments were arranged in a randomized complete block design with four replications. All plots received a weekly application of the fungicide Bravo ZN at a rate of 1-2 pt/acre for late blight control. Insecticide trials we performed focused on the first generation Colorado potato beetle (CPB) larvae. Egg hatch was 100% when the insecticide spray application was made on 1 July. Pre-treatment counts of small larvae (1st and 2nd instars) and large larvae (3rd instars) were made on 10 plants per plot on 1 Jul. Applications were made on 1 Jul with a CO sprayer with T-jet nozzles, a carrier volume of 30 gpa, a spray pressure of 45 psi and a ground speed of 3.5 mph. Nozzles were spaced evenly across four rows on 18" centers and the boom adjusted in height so that there was 100% overlap 12 inches below the top of the canopy. The weather conditions for the day were zero precipitation, a wind speed of less than 5 mph, a maximum temperature of 95°F and a minimum temperature of 76°F. Post-treatment counts of small and large larvae were made on 10 plants per plot on the 3, 8, and 15 Jul. Percent defoliation for each plot was estimated on 15 and 22 Jul. Percent control was calculated as (1 - (treatment count/untreated control count)) x 100 for that day. ANOVA was performed following transformation of count and percentage data using log (x+1) and arcsin Ö (x), respectively. The level of significance was set at P = 0.05 and the Ryan-Einot-Gabriel-Welsch Multiple Range Test was used to separate means. Results are reported in Tables 1, 2, and 3. In general, foliar treatments were effective in CPB control. Colorado beetle pressure was normal for the year. SpinTor 2SC proved to be the most effective in controlling small larvae 14 days after treatment. For large larvae, SpinTor 2SC and Actara 25WG proved the most effective. Actara 25WG, SpinTor 2SC and Provado 1.6F kept defoliation under 25%. Steward 1.25SC was applied in error instead of Avaunt and proved relatively effective in controlling small larvae, although the rate applied was only one-third the rate recommended for that product.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2003

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