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SOIL APPLICATION OF NICOTINOIDS FOR MANAGEMENT OF THE SILVERLEAF WHITEFLY ON FRESH MARKET TOMATOES, FALL 2005

SOIL APPLICATION OF NICOTINOIDS FOR MANAGEMENT OF THE SILVERLEAF WHITEFLY ON FRESH MARKET... (E59) TOMATO: Lycopersicon esculentum Miller ‘Sun Leaper’ SOIL APPLICATION OF NICOTINOIDS FOR MANAGEMENT OF THE SILVERLEAF WHITEFLY ON FRESH MARKET TOMATOES, FALL 2005 David J. Schuster Gulf Coast Res. & Educ. Ctr. 5007 60th St. E. Bradenton, FL 34203 Phone: 941-751-7636 Fax: 941-751-7639 Email: dschust@ufl.edu Silverleaf whitefly: Bemisia argentifolii Bellows & Perring On 2 Aug, transplants were set 18 inches apart on raised beds of Myakka fine sand covered with white polyethylene mulch. Plots were three, 15 ft long rows with rows separated 3 ft end to end and 5 ft side to side, and were irrigated by a seepage sub-irrigation system. Treatments were replicated four times in a randomized complete block design. Treatments were applied as soil drenches following transplanting on 2 Aug to each plant in 4 oz of water. Whitefly densities were assessed on the middle 10 plants of the middle row of each plot. The numbers of adults were counted weekly by carefully turning the nd rd th third leaf of two stems of each plant. The numbers of sessile nymphs (2 , 3 and 4 instars) of the silverleaf whitefly were th th counted weekly on the terminal leaflet from the 7 - 8 leaf counting from the top of each plant. The number of plants in each plot with definite symptoms of the whitefly-vectored geminivirus, Tomato yellow leaf curl virus (TYLCV), was recorded weekly. The silverleaf whitefly population was high early in the trial but decreased to a moderate level (Tables 1-4). The numbers of adults were lower on all treated plots compared to check plots on 10 Aug and 1 and 8 Sep (Table 1). On 24 Aug, there were fewer adults observed in Admire Pro and Platinum treated plots than in the untreated plots. Relative to the check, the nd rd numbers of 2 and 3 instars were lower on all treated plots on 25 Aug and 1 Sep, except for Platinum treated plots on 1 th Sep (Table 2). The numbers of 4 instars were lower on all treated plots compared to the check on 25 Aug (Table 3). On 8 th Sep, fewer 4 instars were observed on plots treated with either Admire Pro or TD 2488-01 compared to the check. Fewer nd rd th total sessile nymphs (2 , 3 and 4 instars) were counted on all treated plot compared to the check on 25 Aug and 1 Sep (Table 4). The incidence of plants with symptoms of TYLCV was high during the experiment, reaching 100% in all plots by 28 Sep (Table 5). The numbers of plants with symptoms of TYLCV were lower on Platinum treated plots compared to the check on 23 Aug, on TD 2484-01 treated plots on 23 and 30 Aug, and on TD 2488-01 treated plots on 30 Aug and 8 Sep. No visible phytotoxicity was observed with any treatment. Table 1 No. silverleaf whitefly adults/20 leaves Treatment/ Rate formulation amt/acre 10 Aug 17 Aug 24 Aug 1 Sep 8 Sep 14 Sep 21 Sep 28 Sep Admire Pro 7.0 oz 5 4 4 3 3 5 1 1 Platinum 2SC 8.0 oz 4 11 5 3 2 6 1 2 TD 2484-01 15WP 27.0 oz 9 7 7 2 2 4 2 1 TD 2488-01 10WP 40.0 oz 7 7 8 2 2 5 1 1 Check --- 13 5 9 4 6 5 1 1 LSD (P = 0.05) --- 4 5 3 1 1 3 1 2 Table 2 nd rd No. silverleaf whitefly 2 and 3 instars/10 leaves Treatment/ Rate formulation amt/acre 25 Aug 1 Sep 8 Sep 14 Sep 21 Sep 29 Sep Admire Pro 7.0 oz 2 1 1 3 4 1 Platinum 2SC 8.0 oz 4 2 3 1 10 2 TD 2484-01 15WP 27.0 oz 1 1 2 1 5 5 TD 2488-01 10WP 40.0 oz 3 0 2 < 1 8 4 Check --- 53 5 4 2 10 5 LSD (P = 0.05) --- 7 4 3 3 8 5 Table 3 rd No. silverleaf whitefly 4 instars/10 leaves Treatment/ Rate formulation amt/acre 25 Aug 1 Sep 8 Sep 14 Sep 21 Sep 29 Sep Admire Pro 7.0 oz 1 0 1 0 < 1 1 Platinum 2SC 8.0 oz 1 0 4 0 2 1 TD 2484-01 15WP 27.0 oz 0 0 2 0 2 < 1 TD 2488-01 10WP 40.0 oz 3 < 1 1 0 1 1 Check --- 34 0 4 0 1 0 LSD (P = 0.05) --- 6 < 1 3 0 3 1 Table 4 No. silverleaf whitefly sessile nymphs/10 leaves Treatment/ Rate formulation amt/acre 25 Aug 1 Sep 8 Sep 14 Sep 21 Sep 29 Sep Admire Pro 7.0 oz 3 1 2 3 4 1 Platinum 2SC 8.0 oz 4 2 7 1 12 3 TD 2484-01 15WP 27.0 oz 1 1 4 1 7 5 TD 2488-01 10WP 40.0 oz 5 < 1 3 < 1 9 5 Check --- 87 5 7 2 11 5 LSD (P = 0.05) --- 5 3 6 3 10 6 Table 5 % plants (of 30) with symptoms of TYLCV Treatment/ Rate formulation amt/acre 16 Aug 23 Aug 30 Aug 8 Sep 14 Sep 21 Sep 28 Sep Admire Pro 7.0 oz 0.0 13.9 35.6 80.5 90.7 100.0 100.0 Platinum 2SC 8.0 oz 0.0 3.5 27.1 78.3 97.5 100.0 100.0 TD 2484-01 15WP 27.0 oz 0.0 3.4 23.7 70.3 85.8 98.3 100.0 TD 2488-01 10WP 40.0 oz 0.0 7.6 20.3 67.3 84.2 98.3 100.0 Check --- 0.8 10.9 38.9 89.8 98.3 100.0 100.0 LSD (P = 0.05) --- 1.2 7.1 18.1 21.9 15.5 2.8 0.0 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

SOIL APPLICATION OF NICOTINOIDS FOR MANAGEMENT OF THE SILVERLEAF WHITEFLY ON FRESH MARKET TOMATOES, FALL 2005

Arthropod Management Tests , Volume 32 (1) – Jan 1, 2007

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10.1093/amt/32.1.E59
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Abstract

(E59) TOMATO: Lycopersicon esculentum Miller ‘Sun Leaper’ SOIL APPLICATION OF NICOTINOIDS FOR MANAGEMENT OF THE SILVERLEAF WHITEFLY ON FRESH MARKET TOMATOES, FALL 2005 David J. Schuster Gulf Coast Res. & Educ. Ctr. 5007 60th St. E. Bradenton, FL 34203 Phone: 941-751-7636 Fax: 941-751-7639 Email: dschust@ufl.edu Silverleaf whitefly: Bemisia argentifolii Bellows & Perring On 2 Aug, transplants were set 18 inches apart on raised beds of Myakka fine sand covered with white polyethylene mulch. Plots were three, 15 ft long rows with rows separated 3 ft end to end and 5 ft side to side, and were irrigated by a seepage sub-irrigation system. Treatments were replicated four times in a randomized complete block design. Treatments were applied as soil drenches following transplanting on 2 Aug to each plant in 4 oz of water. Whitefly densities were assessed on the middle 10 plants of the middle row of each plot. The numbers of adults were counted weekly by carefully turning the nd rd th third leaf of two stems of each plant. The numbers of sessile nymphs (2 , 3 and 4 instars) of the silverleaf whitefly were th th counted weekly on the terminal leaflet from the 7 - 8 leaf counting from the top of each plant. The number of plants in each plot with definite symptoms of the whitefly-vectored geminivirus, Tomato yellow leaf curl virus (TYLCV), was recorded weekly. The silverleaf whitefly population was high early in the trial but decreased to a moderate level (Tables 1-4). The numbers of adults were lower on all treated plots compared to check plots on 10 Aug and 1 and 8 Sep (Table 1). On 24 Aug, there were fewer adults observed in Admire Pro and Platinum treated plots than in the untreated plots. Relative to the check, the nd rd numbers of 2 and 3 instars were lower on all treated plots on 25 Aug and 1 Sep, except for Platinum treated plots on 1 th Sep (Table 2). The numbers of 4 instars were lower on all treated plots compared to the check on 25 Aug (Table 3). On 8 th Sep, fewer 4 instars were observed on plots treated with either Admire Pro or TD 2488-01 compared to the check. Fewer nd rd th total sessile nymphs (2 , 3 and 4 instars) were counted on all treated plot compared to the check on 25 Aug and 1 Sep (Table 4). The incidence of plants with symptoms of TYLCV was high during the experiment, reaching 100% in all plots by 28 Sep (Table 5). The numbers of plants with symptoms of TYLCV were lower on Platinum treated plots compared to the check on 23 Aug, on TD 2484-01 treated plots on 23 and 30 Aug, and on TD 2488-01 treated plots on 30 Aug and 8 Sep. No visible phytotoxicity was observed with any treatment. Table 1 No. silverleaf whitefly adults/20 leaves Treatment/ Rate formulation amt/acre 10 Aug 17 Aug 24 Aug 1 Sep 8 Sep 14 Sep 21 Sep 28 Sep Admire Pro 7.0 oz 5 4 4 3 3 5 1 1 Platinum 2SC 8.0 oz 4 11 5 3 2 6 1 2 TD 2484-01 15WP 27.0 oz 9 7 7 2 2 4 2 1 TD 2488-01 10WP 40.0 oz 7 7 8 2 2 5 1 1 Check --- 13 5 9 4 6 5 1 1 LSD (P = 0.05) --- 4 5 3 1 1 3 1 2 Table 2 nd rd No. silverleaf whitefly 2 and 3 instars/10 leaves Treatment/ Rate formulation amt/acre 25 Aug 1 Sep 8 Sep 14 Sep 21 Sep 29 Sep Admire Pro 7.0 oz 2 1 1 3 4 1 Platinum 2SC 8.0 oz 4 2 3 1 10 2 TD 2484-01 15WP 27.0 oz 1 1 2 1 5 5 TD 2488-01 10WP 40.0 oz 3 0 2 < 1 8 4 Check --- 53 5 4 2 10 5 LSD (P = 0.05) --- 7 4 3 3 8 5 Table 3 rd No. silverleaf whitefly 4 instars/10 leaves Treatment/ Rate formulation amt/acre 25 Aug 1 Sep 8 Sep 14 Sep 21 Sep 29 Sep Admire Pro 7.0 oz 1 0 1 0 < 1 1 Platinum 2SC 8.0 oz 1 0 4 0 2 1 TD 2484-01 15WP 27.0 oz 0 0 2 0 2 < 1 TD 2488-01 10WP 40.0 oz 3 < 1 1 0 1 1 Check --- 34 0 4 0 1 0 LSD (P = 0.05) --- 6 < 1 3 0 3 1 Table 4 No. silverleaf whitefly sessile nymphs/10 leaves Treatment/ Rate formulation amt/acre 25 Aug 1 Sep 8 Sep 14 Sep 21 Sep 29 Sep Admire Pro 7.0 oz 3 1 2 3 4 1 Platinum 2SC 8.0 oz 4 2 7 1 12 3 TD 2484-01 15WP 27.0 oz 1 1 4 1 7 5 TD 2488-01 10WP 40.0 oz 5 < 1 3 < 1 9 5 Check --- 87 5 7 2 11 5 LSD (P = 0.05) --- 5 3 6 3 10 6 Table 5 % plants (of 30) with symptoms of TYLCV Treatment/ Rate formulation amt/acre 16 Aug 23 Aug 30 Aug 8 Sep 14 Sep 21 Sep 28 Sep Admire Pro 7.0 oz 0.0 13.9 35.6 80.5 90.7 100.0 100.0 Platinum 2SC 8.0 oz 0.0 3.5 27.1 78.3 97.5 100.0 100.0 TD 2484-01 15WP 27.0 oz 0.0 3.4 23.7 70.3 85.8 98.3 100.0 TD 2488-01 10WP 40.0 oz 0.0 7.6 20.3 67.3 84.2 98.3 100.0 Check --- 0.8 10.9 38.9 89.8 98.3 100.0 100.0 LSD (P = 0.05) --- 1.2 7.1 18.1 21.9 15.5 2.8 0.0

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2007

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