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CONTROL OF APHIDS ON IRISH POTATO, 2009

CONTROL OF APHIDS ON IRISH POTATO, 2009 Arthropod Management Tests 2010, Vol. 35 doi: 10.4182/amt.2010.E18 E18 POTATO: Solanum tuberosum L., ‘Katahdin’. Gary H. Sewell Aroostook Farm 59 Houlton Rd. Presque Isle, ME 04769 Phone: (207) 768-5963 Fax: (207) 764-6740 E-mail: gsewell@maine.edu Andrei Alyokhin 5722 Deering Hall, Rm 315E University of Maine Orono, ME 04469 Phone: (207) 581-2977 Fax: (207) 581-2969 E-mail: andrei.alyokhin@umit.maine.edu Buckthorn aphid (BA): Aphis nasturtii Kaltenbach Potato aphid (PA): Macrosiphum euphorbiae (Thomas) Green peach aphid (GPA): Myzus persicae (Sulzer) The ability of aphids to spread viruses makes it very important to continue testing new chemistries and the efficacy of existing compounds. The RCB design experiment had four replications and was planted 09 Jun 2009 at Presque Isle, ME. A 10 ft space between blocks and a 6 ft space between the four-row plots were left fallow. All rows were 50 ft long. Two-oz seed pieces were hand planted at 12 inch spacing. Fertilizer and hilling practices were normal for the area. Early and late blight were controlled by seven foliar applications of mancozeb. Foliar insecticide applications were made on Aug 3 with a Century boom sprayer, three nozzles per row at 60-psi pressure and 50 gpa. Blackhawk (3.2 oz/acre) was applied to all treatments on 14 Jul to control Colorado potato beetles. Numbers of aphids (by species) were counted weekly on a top, middle and bottom leaf of 20 plants in the middle two rows of each plot. The soil was classified as Caribou Loam, pH 5.2. Total monthly rainfall for Jun, Jul, and Aug was 4.60, 4.95 and 2.24 inches and the avg temp was 62, 64 and 68 F, respectively. ANOVA were calculated following transformation of the data using log (x+1). Transformed means of the total number of wingless aphids were compared using Fisher's LSD Test (P=0.05). The aphid population in 2009 was low and comprised primarily of PA: early Jul – PA 100%; late Jul – BA 5 % and PA 95%; early Aug – GPA 0.1% and PA 99.9%. Although the effects of the materials were not instant, they only needed one application to reduce numbers below threshold (Table 1). Tuber samples were taken at harvest to check for virus spread next season. No phytotoxicity was observed with any of the treatments. Table 1. Transformed no. wingless aphids/20 plants Treatment/ Rate Formulation fl oz/acre 24 Jul 31 Jul 06 Aug 12 Aug Untreated Control --- 11.1a 16.9a 6.1a 11.2a Movento 240 G/L SC 5.0 + Dyne-amic SL 0.25 vol/vol 10.3a 21.1a 7.6a 0.7bc Movento 240 G/L SC 5.0 + Dyne-amic SL 0.25 vol/vol + Baythroid XL SC 2.8 9.4a 29.7a 2.0a 0.0c CMT560 240 G/L SC 6.0 + Baythroid XL SC 2.8 8.6a 20.9a 3.7a 3.1b CMT560 240 G/L SC 6.0 7.9a 14.5a 5.5a 2.2b Fulfill WP 5.5 3.9a 21.5a 3.5a 1.8bc Means in a column followed by the same letter are not significantly different (LSD, P = 0.05). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF APHIDS ON IRISH POTATO, 2009

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.4182/amt.2010.E18
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Abstract

Arthropod Management Tests 2010, Vol. 35 doi: 10.4182/amt.2010.E18 E18 POTATO: Solanum tuberosum L., ‘Katahdin’. Gary H. Sewell Aroostook Farm 59 Houlton Rd. Presque Isle, ME 04769 Phone: (207) 768-5963 Fax: (207) 764-6740 E-mail: gsewell@maine.edu Andrei Alyokhin 5722 Deering Hall, Rm 315E University of Maine Orono, ME 04469 Phone: (207) 581-2977 Fax: (207) 581-2969 E-mail: andrei.alyokhin@umit.maine.edu Buckthorn aphid (BA): Aphis nasturtii Kaltenbach Potato aphid (PA): Macrosiphum euphorbiae (Thomas) Green peach aphid (GPA): Myzus persicae (Sulzer) The ability of aphids to spread viruses makes it very important to continue testing new chemistries and the efficacy of existing compounds. The RCB design experiment had four replications and was planted 09 Jun 2009 at Presque Isle, ME. A 10 ft space between blocks and a 6 ft space between the four-row plots were left fallow. All rows were 50 ft long. Two-oz seed pieces were hand planted at 12 inch spacing. Fertilizer and hilling practices were normal for the area. Early and late blight were controlled by seven foliar applications of mancozeb. Foliar insecticide applications were made on Aug 3 with a Century boom sprayer, three nozzles per row at 60-psi pressure and 50 gpa. Blackhawk (3.2 oz/acre) was applied to all treatments on 14 Jul to control Colorado potato beetles. Numbers of aphids (by species) were counted weekly on a top, middle and bottom leaf of 20 plants in the middle two rows of each plot. The soil was classified as Caribou Loam, pH 5.2. Total monthly rainfall for Jun, Jul, and Aug was 4.60, 4.95 and 2.24 inches and the avg temp was 62, 64 and 68 F, respectively. ANOVA were calculated following transformation of the data using log (x+1). Transformed means of the total number of wingless aphids were compared using Fisher's LSD Test (P=0.05). The aphid population in 2009 was low and comprised primarily of PA: early Jul – PA 100%; late Jul – BA 5 % and PA 95%; early Aug – GPA 0.1% and PA 99.9%. Although the effects of the materials were not instant, they only needed one application to reduce numbers below threshold (Table 1). Tuber samples were taken at harvest to check for virus spread next season. No phytotoxicity was observed with any of the treatments. Table 1. Transformed no. wingless aphids/20 plants Treatment/ Rate Formulation fl oz/acre 24 Jul 31 Jul 06 Aug 12 Aug Untreated Control --- 11.1a 16.9a 6.1a 11.2a Movento 240 G/L SC 5.0 + Dyne-amic SL 0.25 vol/vol 10.3a 21.1a 7.6a 0.7bc Movento 240 G/L SC 5.0 + Dyne-amic SL 0.25 vol/vol + Baythroid XL SC 2.8 9.4a 29.7a 2.0a 0.0c CMT560 240 G/L SC 6.0 + Baythroid XL SC 2.8 8.6a 20.9a 3.7a 3.1b CMT560 240 G/L SC 6.0 7.9a 14.5a 5.5a 2.2b Fulfill WP 5.5 3.9a 21.5a 3.5a 1.8bc Means in a column followed by the same letter are not significantly different (LSD, P = 0.05).

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2010

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