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Potato Insect Control, 1991

Potato Insect Control, 1991 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/125/4639316 by DeepDyve user on 02 August 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 19 125 Defoliation Yield in lbs per 45 row rating' feet rate/acre Size A Size B 6 Jul 12 Jul Treatment Untreated 6.25 ± 2.17 5.38 ± 1.21 5.2 5.7 Imidan 2.5 EC + LI-700 1 lb AI + 1 pt/100 g 11.88 ± 5.66ab 5.38 ± 0.55ab 4.4 5.1 Imidan 70 WP + LI-700 1 lb AI + 1 pt/100 g 4.00 ± 1.08a 4.38 ± 0.47a 5.2 5.8 Asana XL + PBO 6 oz. + 8 oz. 39.25 ± 11.12abc 6.75 ± 0.95ab 2.3 2.7 Asana XL + Monitor + PBO 6 oz. + 0.5 lb AI + 8 oz. 47.75 ± 6.57bc 8.00 ± 1,08ab 2.3 2.7 AC303,630 + Silwet 0.10 lb AI + 8 fl oz/100 g 69.25 ± 6.77c 7.25 ± 1.36ab 1.7 1.7 AC303,630 + Silwet 0.15 lb AI + 8 fl oz/100 g 53.75 ± 3.64c 6.75 ± 0.48ab 1.5 2.7 AC303.630 + Silwet 0.20 lb AI + 8 fl oz/100 g 61.50 ± 7.77c 6.13 ± 0.77ab 2.3 2.7 AC303.630 + Silwet 5 gpa 0.10 lb AI + 8 fl oz/100 g 63.13 ± 9.87c 6.75 ± 1.38ab 2.0 2.7 AC303.630 + Silwet 50 gpa 0.10 lb AI + 8 fl oz/100 g 57.88 ± 10.90c 8.00 ± 0.46ab 2.0 1.9 AC303.630 + Silwet 100 gpa 0.10 lb AI + 8 fl oz/100 g 49.88 ± 4.63c 7.38 ± 0.94ab 1.2 1.8 Admire 240FS in furrow 0.90 fl oz/1000' row 71.00 ± 4.20c 8.13 0.72ab 1.3 2.1 Admire 240FS + Silwet 2.88 fl oz + 8 fl oz/100 g 61.00 ± 10.73c 10.13 ± 1.42b 1.2 1.2 Cryolite WDG 12 lb 41.50 ± 4.00abc 7.25 2.25ab 2.1 2.0 Means within a column followed by the same letter are not significantly different (P > 0.05, Tukey's HSD). 'Defoliation Rating. 1, no defoliation; 2, 0%-5 % defoliation; 3, 5%-25 % defoliation (some whole leaflets eaten); 4, 25%-50% defoliation (some whole leaves eaten); 5, 50%-100% defoliation (whole stems bare). POTATO: Solatium tuberosum L. cv. 'Superior' A. C. Slocombe and D. N. Ferro (85E) Colorado potato beetle (CPB); Leptinotarsa decemlineata (Say) Department of Entomology University of Massachusetts Amherst, MA 01003 POTATO INSECT CONTROL, 1991: Potatoes were planted on 7 May in South Deerfield, Massachusetts. Fertilizer (900 lbs 10N:10P:10K/ acre) was banded into the furrow at planting. Soil type was a fine sandy loam with a pH of 5.6. Manzate (fungicide) was applied at 1 lb. Al/acre on 14, 21 , and 28 Jun and 11 and 18 Jul. CPB densities prior to first application were 2.9 adults, 8.2 egg masses, 16.3 early instars and 0.8 late instars per plant on 10 Jun. Treatments were replicated 4 times in a randomized complete block design. Each plot consisted of two 30 ft. rows with a 6 ft. fallow area between plots. Treatments were applied with CO -pressurized sprayers at 40 psi, delivering 70 gal/acre. Applications were made on 10, 17, and 24 Jun and 1 and 10 Jul. The first application of ECX9124EH was on 17 Jun. CPB population densities were determined by counting larvae on 10 whole stalks in each plot. To evaluate microbial insecticides M-Trak, Foil OF, Foil DF, ECX9124EH and Novodor, larvae were counted and recorded as early instars (first and second) or late instars (third and fourth). The performance of these materials was evaluated primarily by comparing late instars, as it took 4-5 days for the dead larvae to drop from the plants and early instars could have hatched between the last spray and the following count. The control plots were 70% defoliated when they were plowed under on 3 Jul. All rates of Foil OF, M-Trak, Novodor and Asana XL maintained CPB populations below economic injury levels. x CPB larvae/plant % Defol Rate/ 2 Jul Treatment Early Late 15 Jul acre Late Foil DF 1.0 lb 16.0ab 9.6abc 8.8a 31 Foil DF 1.5 lb 16.5ab 7.8abcd 6.2ab 23 Foil DF 10.6abc 2.0 lb 3.7cde 6.8ab 30 Foil OF 1.45 qt 6.6c 3.Ode 3.5bcd 13 Foil OF 2.18 qt 7.0c 3.1cde 6.6ab 15 Foil OF 2.9 qt 8.7bc 4.3cde 4.7cd 13 14.6abc ECX9124EH 1.0 lb 11. lab 9.8a 41 ECX9124EH 1.5 lb 18.2a 14.0a 9.6a 50 Novodor 6.1c Li e 2.0 qt 0.2d 3 M-Trak 6.3c 3.0 qt 1.8de 1.9cd 13 Asana XL 9.1 be 9.6 oz 6.3bcde 4.2bc 14 Control — 35.2 22.2 17.3 —" Means within a column sharing letters in common are not significantly different (Tukey's Studentized Range [HSD] Test, 95% C.L.). "70% defoliated on 3 Jul. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Potato Insect Control, 1991

Arthropod Management Tests , Volume 19 (1) – Jan 1, 1994

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Oxford University Press
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© 1994, Entomological Society of America
eISSN
2155-9856
DOI
10.1093/amt/19.1.125
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/19/1/125/4639316 by DeepDyve user on 02 August 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 19 125 Defoliation Yield in lbs per 45 row rating' feet rate/acre Size A Size B 6 Jul 12 Jul Treatment Untreated 6.25 ± 2.17 5.38 ± 1.21 5.2 5.7 Imidan 2.5 EC + LI-700 1 lb AI + 1 pt/100 g 11.88 ± 5.66ab 5.38 ± 0.55ab 4.4 5.1 Imidan 70 WP + LI-700 1 lb AI + 1 pt/100 g 4.00 ± 1.08a 4.38 ± 0.47a 5.2 5.8 Asana XL + PBO 6 oz. + 8 oz. 39.25 ± 11.12abc 6.75 ± 0.95ab 2.3 2.7 Asana XL + Monitor + PBO 6 oz. + 0.5 lb AI + 8 oz. 47.75 ± 6.57bc 8.00 ± 1,08ab 2.3 2.7 AC303,630 + Silwet 0.10 lb AI + 8 fl oz/100 g 69.25 ± 6.77c 7.25 ± 1.36ab 1.7 1.7 AC303,630 + Silwet 0.15 lb AI + 8 fl oz/100 g 53.75 ± 3.64c 6.75 ± 0.48ab 1.5 2.7 AC303.630 + Silwet 0.20 lb AI + 8 fl oz/100 g 61.50 ± 7.77c 6.13 ± 0.77ab 2.3 2.7 AC303.630 + Silwet 5 gpa 0.10 lb AI + 8 fl oz/100 g 63.13 ± 9.87c 6.75 ± 1.38ab 2.0 2.7 AC303.630 + Silwet 50 gpa 0.10 lb AI + 8 fl oz/100 g 57.88 ± 10.90c 8.00 ± 0.46ab 2.0 1.9 AC303.630 + Silwet 100 gpa 0.10 lb AI + 8 fl oz/100 g 49.88 ± 4.63c 7.38 ± 0.94ab 1.2 1.8 Admire 240FS in furrow 0.90 fl oz/1000' row 71.00 ± 4.20c 8.13 0.72ab 1.3 2.1 Admire 240FS + Silwet 2.88 fl oz + 8 fl oz/100 g 61.00 ± 10.73c 10.13 ± 1.42b 1.2 1.2 Cryolite WDG 12 lb 41.50 ± 4.00abc 7.25 2.25ab 2.1 2.0 Means within a column followed by the same letter are not significantly different (P > 0.05, Tukey's HSD). 'Defoliation Rating. 1, no defoliation; 2, 0%-5 % defoliation; 3, 5%-25 % defoliation (some whole leaflets eaten); 4, 25%-50% defoliation (some whole leaves eaten); 5, 50%-100% defoliation (whole stems bare). POTATO: Solatium tuberosum L. cv. 'Superior' A. C. Slocombe and D. N. Ferro (85E) Colorado potato beetle (CPB); Leptinotarsa decemlineata (Say) Department of Entomology University of Massachusetts Amherst, MA 01003 POTATO INSECT CONTROL, 1991: Potatoes were planted on 7 May in South Deerfield, Massachusetts. Fertilizer (900 lbs 10N:10P:10K/ acre) was banded into the furrow at planting. Soil type was a fine sandy loam with a pH of 5.6. Manzate (fungicide) was applied at 1 lb. Al/acre on 14, 21 , and 28 Jun and 11 and 18 Jul. CPB densities prior to first application were 2.9 adults, 8.2 egg masses, 16.3 early instars and 0.8 late instars per plant on 10 Jun. Treatments were replicated 4 times in a randomized complete block design. Each plot consisted of two 30 ft. rows with a 6 ft. fallow area between plots. Treatments were applied with CO -pressurized sprayers at 40 psi, delivering 70 gal/acre. Applications were made on 10, 17, and 24 Jun and 1 and 10 Jul. The first application of ECX9124EH was on 17 Jun. CPB population densities were determined by counting larvae on 10 whole stalks in each plot. To evaluate microbial insecticides M-Trak, Foil OF, Foil DF, ECX9124EH and Novodor, larvae were counted and recorded as early instars (first and second) or late instars (third and fourth). The performance of these materials was evaluated primarily by comparing late instars, as it took 4-5 days for the dead larvae to drop from the plants and early instars could have hatched between the last spray and the following count. The control plots were 70% defoliated when they were plowed under on 3 Jul. All rates of Foil OF, M-Trak, Novodor and Asana XL maintained CPB populations below economic injury levels. x CPB larvae/plant % Defol Rate/ 2 Jul Treatment Early Late 15 Jul acre Late Foil DF 1.0 lb 16.0ab 9.6abc 8.8a 31 Foil DF 1.5 lb 16.5ab 7.8abcd 6.2ab 23 Foil DF 10.6abc 2.0 lb 3.7cde 6.8ab 30 Foil OF 1.45 qt 6.6c 3.Ode 3.5bcd 13 Foil OF 2.18 qt 7.0c 3.1cde 6.6ab 15 Foil OF 2.9 qt 8.7bc 4.3cde 4.7cd 13 14.6abc ECX9124EH 1.0 lb 11. lab 9.8a 41 ECX9124EH 1.5 lb 18.2a 14.0a 9.6a 50 Novodor 6.1c Li e 2.0 qt 0.2d 3 M-Trak 6.3c 3.0 qt 1.8de 1.9cd 13 Asana XL 9.1 be 9.6 oz 6.3bcde 4.2bc 14 Control — 35.2 22.2 17.3 —" Means within a column sharing letters in common are not significantly different (Tukey's Studentized Range [HSD] Test, 95% C.L.). "70% defoliated on 3 Jul.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1994

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