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CONTROL OF POTATO INSECT PESTS USING TREATED POTATO SEEDS, 1999

CONTROL OF POTATO INSECT PESTS USING TREATED POTATO SEEDS, 1999 (E68) POTATO: Solanum tuberosum L., 'Russet Burbank' Colorado potato beetle (CPB): Leptinotarsa decemlineata (Say) Potato leafhopper (PLH): Empoasca fabae (Harris) Green peach aphid (GPA): Myzus persicae (Sulzer) Joseph Munyaneza, David W. Ragsdale, and Edward B. Radcliffe Department of Entomology University of Minnesota 219 Hodson Hall St Paul, MN 55108 Phone: (612) 624-2751 Fax: (612) 625-5299 Email: munya002@tc.umn.edu CONTROL OF POTATO INSECT PESTS USING TREATED POTATO SEEDS, 1999: Potatoes were planted on 20 May at the University of Minnesota Agricultural Experiment Station, Rosemount, MN. Each plot consisted of four 50-ft long rows. Plant spacing was 36 inches between rows and 12 inches between plants within rows. Plots were separated by 35x6 ft of cultivated soil. Treatments were arranged in a completely randomized design with four replications. Each plot was planted with 28 lb (20 cwt/acre) of potatoes. Before planting, potato seed pieces were coated with the products tested by putting them together into plastic bags and shaking thoroughly. In-furrow, Admire 2F was applied using an electric powered "dribble" applicator attached to the planter and placing the insecticide ahead of the seed piece. Platinum 2SC was applied in furrow using a CO pressurized sprayer. Temik 15G was applied in-furrow by sprinkling it at the rate of 21 oz product/1000 row feet. Throughout the experiment, there was no foliar application except weekly application of the fungicide Bravo Zn or Curzate 60DF to prevent late blight infection, starting 21 Jun. First and 2nd generation CPB larvae were counted on 10 potato plants per plots on 30 Jun, 6 Jul, 2, 11, and 17 Aug. PLH nymphs (excluding 1st instars) were counted weekly on 35 mid-plant leaves per plot from 8 Jul to 18 Aug. GPA were weekly counted on 35 mid-plant leaves per plot from 13 Jul to 18 Aug. After 18 Aug, no leafhopper or aphid counts were taken because some plots were completely defoliated by CPB. Percent defoliation was estimated on 7 Jul, 1, 10, and 17 Sep. Potatoes were harvested and graded on 23 Sep. Analyses of variance were performed following transformation of count and percentage data using log (x+1) and arcsin (check)(x), respectively. Yield data were not transformed before analysis of variance. st All the insecticide treatments successfully controlled the 1 generation CPB. However, most of the tested materials failed to control the 2nd generation of the beetles. Only Platinum was effective in controlling the CPB throughout the season. In general, most of the tested materials controlled leafhoppers early in the season compared to the untreated control. However, most treatments exceeded the economic threshold (10 nymphs/1000 leaves). Platinum and Adage provided the best leafhopper control throughout the season. Temik and Admire applied as seed treatments provided leafhopper control until early Aug but later exceeded PLH economic threshold. All tested materials controlled the green peach aphids after late Jul. Platinum and Adage provided the best aphid control throughout the season. At the end of the season, Platinum, Adage, and Admire applied as seed treatments sustained the lowest defoliation. However, only Platinum had a defoliation lower than the economic threshold (10%). Plots treated with Temik did not show any defoliation until early Sep. Plots treated with the fungicide Maxim alone had the highest defoliation. Platinum, Adage, and Admire applied as seed treatments had the highest yield. Maxim alone had the lowest yield. In general, all treatments produced more U.S. No.2 and B-size potatoes. There were almost no oversize potatoes produced. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF POTATO INSECT PESTS USING TREATED POTATO SEEDS, 1999

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/25.1.E68
Publisher site
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Abstract

(E68) POTATO: Solanum tuberosum L., 'Russet Burbank' Colorado potato beetle (CPB): Leptinotarsa decemlineata (Say) Potato leafhopper (PLH): Empoasca fabae (Harris) Green peach aphid (GPA): Myzus persicae (Sulzer) Joseph Munyaneza, David W. Ragsdale, and Edward B. Radcliffe Department of Entomology University of Minnesota 219 Hodson Hall St Paul, MN 55108 Phone: (612) 624-2751 Fax: (612) 625-5299 Email: munya002@tc.umn.edu CONTROL OF POTATO INSECT PESTS USING TREATED POTATO SEEDS, 1999: Potatoes were planted on 20 May at the University of Minnesota Agricultural Experiment Station, Rosemount, MN. Each plot consisted of four 50-ft long rows. Plant spacing was 36 inches between rows and 12 inches between plants within rows. Plots were separated by 35x6 ft of cultivated soil. Treatments were arranged in a completely randomized design with four replications. Each plot was planted with 28 lb (20 cwt/acre) of potatoes. Before planting, potato seed pieces were coated with the products tested by putting them together into plastic bags and shaking thoroughly. In-furrow, Admire 2F was applied using an electric powered "dribble" applicator attached to the planter and placing the insecticide ahead of the seed piece. Platinum 2SC was applied in furrow using a CO pressurized sprayer. Temik 15G was applied in-furrow by sprinkling it at the rate of 21 oz product/1000 row feet. Throughout the experiment, there was no foliar application except weekly application of the fungicide Bravo Zn or Curzate 60DF to prevent late blight infection, starting 21 Jun. First and 2nd generation CPB larvae were counted on 10 potato plants per plots on 30 Jun, 6 Jul, 2, 11, and 17 Aug. PLH nymphs (excluding 1st instars) were counted weekly on 35 mid-plant leaves per plot from 8 Jul to 18 Aug. GPA were weekly counted on 35 mid-plant leaves per plot from 13 Jul to 18 Aug. After 18 Aug, no leafhopper or aphid counts were taken because some plots were completely defoliated by CPB. Percent defoliation was estimated on 7 Jul, 1, 10, and 17 Sep. Potatoes were harvested and graded on 23 Sep. Analyses of variance were performed following transformation of count and percentage data using log (x+1) and arcsin (check)(x), respectively. Yield data were not transformed before analysis of variance. st All the insecticide treatments successfully controlled the 1 generation CPB. However, most of the tested materials failed to control the 2nd generation of the beetles. Only Platinum was effective in controlling the CPB throughout the season. In general, most of the tested materials controlled leafhoppers early in the season compared to the untreated control. However, most treatments exceeded the economic threshold (10 nymphs/1000 leaves). Platinum and Adage provided the best leafhopper control throughout the season. Temik and Admire applied as seed treatments provided leafhopper control until early Aug but later exceeded PLH economic threshold. All tested materials controlled the green peach aphids after late Jul. Platinum and Adage provided the best aphid control throughout the season. At the end of the season, Platinum, Adage, and Admire applied as seed treatments sustained the lowest defoliation. However, only Platinum had a defoliation lower than the economic threshold (10%). Plots treated with Temik did not show any defoliation until early Sep. Plots treated with the fungicide Maxim alone had the highest defoliation. Platinum, Adage, and Admire applied as seed treatments had the highest yield. Maxim alone had the lowest yield. In general, all treatments produced more U.S. No.2 and B-size potatoes. There were almost no oversize potatoes produced.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2000

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