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Colorado Potato Beetle Control on Potatoes, 1993

Colorado Potato Beetle Control on Potatoes, 1993 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/112/4639301 by DeepDyve user on 02 August 2020 112 Arthropod Management Tests, Vol. 19 E: VEGETABLE CROPS POTATO: Solanum tuberosum L. 'Kennebec' James J. Linduska, Marylee Ross, and Nancy McShane (69E) Colorado potato beetle (CPB); Leptinotarsa decemlineata (Say) University of Maryland LESREC/Salisbury Facility 27664 Nanticoke Road Salisbury, MD 21801 COLORADO POTATO BEETLE CONTROL ON POTATOES, 1993: 'Kennebec' potatoes were planted in 20 foot rows on 8 Apr, '93. Plots consisted of a single treatment row. Distance between rows was 64 inches and the distance between plants within the row was 10 inches. Plots were arranged in a randomized complete block design with 4 replications. The soil was a Norfolk "A " loamy sand. All spray treatments were mixed in 1.5 gallons of water and applied with a custom built compressed air row crop sprayer. Each row was covered by 6 drop nozzles delivering 50 gal/ acre at 28 psi. Plots receiving Stalker were treated on 7, 10 and 14 day schedules. Weekly treatments were applied 21 and 29 May; 2, 4, 11 and 18 Jun. Plots on 10-day schedules were treated 21 May; 4 and 11 Jun. Plots on 14-day schedules were treated on 21 May; 4 and 18 Jun. In evaluating the treatments, direct counts of the number of Colorado potato beetle adults, larvae and egg masses/10 plants and the % defoliation were recorded. Defoliation categories were assigned using a pretransformed defoliation rating scale, based on dividing 90° into 13 steps corresponding to arcsin transformation values (Little & Hills 1978). Yields were taken on 22 Jul from 20 feet of row. Insect pressure was moderately heavy. Mean no. CPB/10 plants Rate 1st and 2nd 3rd and 4th % Defoli­ Yield US #1 lb AI/ Spray instar instar Adults ation per 20 ft row Treatment acre interval 1 Jun 1 Jun 17 Jun 24 Jun 22 Jul — — Untreated 177.25 a 197.50 a 59.25 a 97.53 a 2.60 c Vydate 2L 0.75 7 Day 12.00 b 9.00 b 3.75 c 4.63 c 19.85 a Stalker 2 EC 0.15 7 Day 0.00 b 0.00 b 23.50 b- c 43.90 b 15.81 a-b Stalker 2 EC 0.15 10 Day 3.25 b 0.50 b 33.50 b 56.10 b 12.11 b Stalker 2 EC 0.15 14 Day 17.00 b 3.50 b 32.75 b 43.90 b 14.06 a-b Means followed by the same letter do not differ at the 5% level based on DMRT. POTATO: Solanum tuberosum L. 'Kennebec' James J. Linduska, Marylee Ross, and Nancy McShane (70E) Colorado potato beetle (CPB); Leptinotarsa decemlineata (Say) University of Maryland LESREC/Salisbury Facility 27664 Nanticoke Road Salisbury, MD 21801 COLORADO POTATO BEETLE CONTROL ON POTATOES, 1993: 'Kennebec' potatoes were planted in 20 foot rows on 8 Apr, '93. Plots consisted of 5 treatment rows. The distance between rows was 64 inches and the distance between plants within the row was 10 inches. Plots were arranged in a randomized complete block design with 4 replications. The soil was a Norfolk "A " loamy sand. All spray treatments were mixed in 1.5 gallons of water and applied with a custom built compressed air row crop sprayer. Each row was covered by 6 drop nozzles delivering 50 gal/acre at 28 psi. Treatments of Admire, Novodor and Vydate were applied 21 May; 2, 9, 16 Jun. Plots receiving Trigard 75WP were treated 21 May at .250 lb Al/acre and 2, 14 Jun at .125 lb Al/acre. Plots receiving Trigard, Novodor, and Vydate were treated with Vydate 2L at 0.75 lb Al/acre on 22 Jun to control Colorado potato beetle adults. In evaluating the treatments, direct counts of the number of Colorado potato beetle adults, larvae and egg mass/ 10 plants and the % defoliation were recorded. Defoliation categories were assigned using a pretransformed defoliation rating scale, based on dividing 90° into 13 steps corresponding to arcsin transformation values (Little & Hill 1978). Yields were taken on 28 Jul from 20 feet of row. Insect pressure was moderately low. Mean no. CPB/10 plants 1st and 3rd and Yield US Rate 2nd 4th % Defoli­ #1 per lb AI/ Spray instar instar Adults ation 20 ft row Treatment acre schedule 24 May 4 Jun 18 Jun 28 Jun 28 Jul — — Untreated 74.75 a 280.75 a 35.75 a 97.53 a 0.40 b Admire 2 FL 0.44 lb Weekly 1.25 b 0.00 b 0.00 b 1.4 b 15.26 a Trigard 75 WP + 0.25 lb 30% Egg Hatch 29.00 b 7.50 b 8.25 b 4.63 b 10.88 a Trigard 75 WP 0.125 lb 10-14 Days Novodor FL 3q t Weekly 24.00 b 2.50 b 2.25 b 3.55 b 12.54 a Vydate 2L 0.75 lb Weekly 1.75 b 2.75 b 0.50 b 1.4 b 14.61 a Means followed by the same letter do not differ at the 5% level based on DMRT. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Colorado Potato Beetle Control on Potatoes, 1993

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Publisher
Oxford University Press
Copyright
© 1994, Entomological Society of America
eISSN
2155-9856
DOI
10.1093/amt/19.1.112a
Publisher site
See Article on Publisher Site

Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/19/1/112/4639301 by DeepDyve user on 02 August 2020 112 Arthropod Management Tests, Vol. 19 E: VEGETABLE CROPS POTATO: Solanum tuberosum L. 'Kennebec' James J. Linduska, Marylee Ross, and Nancy McShane (69E) Colorado potato beetle (CPB); Leptinotarsa decemlineata (Say) University of Maryland LESREC/Salisbury Facility 27664 Nanticoke Road Salisbury, MD 21801 COLORADO POTATO BEETLE CONTROL ON POTATOES, 1993: 'Kennebec' potatoes were planted in 20 foot rows on 8 Apr, '93. Plots consisted of a single treatment row. Distance between rows was 64 inches and the distance between plants within the row was 10 inches. Plots were arranged in a randomized complete block design with 4 replications. The soil was a Norfolk "A " loamy sand. All spray treatments were mixed in 1.5 gallons of water and applied with a custom built compressed air row crop sprayer. Each row was covered by 6 drop nozzles delivering 50 gal/ acre at 28 psi. Plots receiving Stalker were treated on 7, 10 and 14 day schedules. Weekly treatments were applied 21 and 29 May; 2, 4, 11 and 18 Jun. Plots on 10-day schedules were treated 21 May; 4 and 11 Jun. Plots on 14-day schedules were treated on 21 May; 4 and 18 Jun. In evaluating the treatments, direct counts of the number of Colorado potato beetle adults, larvae and egg masses/10 plants and the % defoliation were recorded. Defoliation categories were assigned using a pretransformed defoliation rating scale, based on dividing 90° into 13 steps corresponding to arcsin transformation values (Little & Hills 1978). Yields were taken on 22 Jul from 20 feet of row. Insect pressure was moderately heavy. Mean no. CPB/10 plants Rate 1st and 2nd 3rd and 4th % Defoli­ Yield US #1 lb AI/ Spray instar instar Adults ation per 20 ft row Treatment acre interval 1 Jun 1 Jun 17 Jun 24 Jun 22 Jul — — Untreated 177.25 a 197.50 a 59.25 a 97.53 a 2.60 c Vydate 2L 0.75 7 Day 12.00 b 9.00 b 3.75 c 4.63 c 19.85 a Stalker 2 EC 0.15 7 Day 0.00 b 0.00 b 23.50 b- c 43.90 b 15.81 a-b Stalker 2 EC 0.15 10 Day 3.25 b 0.50 b 33.50 b 56.10 b 12.11 b Stalker 2 EC 0.15 14 Day 17.00 b 3.50 b 32.75 b 43.90 b 14.06 a-b Means followed by the same letter do not differ at the 5% level based on DMRT. POTATO: Solanum tuberosum L. 'Kennebec' James J. Linduska, Marylee Ross, and Nancy McShane (70E) Colorado potato beetle (CPB); Leptinotarsa decemlineata (Say) University of Maryland LESREC/Salisbury Facility 27664 Nanticoke Road Salisbury, MD 21801 COLORADO POTATO BEETLE CONTROL ON POTATOES, 1993: 'Kennebec' potatoes were planted in 20 foot rows on 8 Apr, '93. Plots consisted of 5 treatment rows. The distance between rows was 64 inches and the distance between plants within the row was 10 inches. Plots were arranged in a randomized complete block design with 4 replications. The soil was a Norfolk "A " loamy sand. All spray treatments were mixed in 1.5 gallons of water and applied with a custom built compressed air row crop sprayer. Each row was covered by 6 drop nozzles delivering 50 gal/acre at 28 psi. Treatments of Admire, Novodor and Vydate were applied 21 May; 2, 9, 16 Jun. Plots receiving Trigard 75WP were treated 21 May at .250 lb Al/acre and 2, 14 Jun at .125 lb Al/acre. Plots receiving Trigard, Novodor, and Vydate were treated with Vydate 2L at 0.75 lb Al/acre on 22 Jun to control Colorado potato beetle adults. In evaluating the treatments, direct counts of the number of Colorado potato beetle adults, larvae and egg mass/ 10 plants and the % defoliation were recorded. Defoliation categories were assigned using a pretransformed defoliation rating scale, based on dividing 90° into 13 steps corresponding to arcsin transformation values (Little & Hill 1978). Yields were taken on 28 Jul from 20 feet of row. Insect pressure was moderately low. Mean no. CPB/10 plants 1st and 3rd and Yield US Rate 2nd 4th % Defoli­ #1 per lb AI/ Spray instar instar Adults ation 20 ft row Treatment acre schedule 24 May 4 Jun 18 Jun 28 Jun 28 Jul — — Untreated 74.75 a 280.75 a 35.75 a 97.53 a 0.40 b Admire 2 FL 0.44 lb Weekly 1.25 b 0.00 b 0.00 b 1.4 b 15.26 a Trigard 75 WP + 0.25 lb 30% Egg Hatch 29.00 b 7.50 b 8.25 b 4.63 b 10.88 a Trigard 75 WP 0.125 lb 10-14 Days Novodor FL 3q t Weekly 24.00 b 2.50 b 2.25 b 3.55 b 12.54 a Vydate 2L 0.75 lb Weekly 1.75 b 2.75 b 0.50 b 1.4 b 14.61 a Means followed by the same letter do not differ at the 5% level based on DMRT.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1994

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