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SILVERLEAF WHITEFLY AND LEAFMINER MANAGEMENT ON SQUASH, SPRING 2006

SILVERLEAF WHITEFLY AND LEAFMINER MANAGEMENT ON SQUASH, SPRING 2006 (E45) SQUASH (YELLOW): Cucurbita pepo L., ‘Enterprise’ David J. Schuster Gulf Coast Res. & Educ. Ctr. 14625 CR 672 Wimauma, FL 33598 Phone: 813-633-4124 Fax: 813-634-0001 Email: dschust@ufl.edu Silverleaf whitefly: Bemisia argentifolii Bellows & Perring Leafminer: Liriomyza trifolii (Burgess) Transplants were set 28 Mar, 1.5 ft apart within the row on 8-inch-high and 32-inch-wide beds of Myakka fine sand covered with white polyethylene mulch. Each plot consisted of a single 21 ft-long row spaced 11 ft end to end and 10 ft apart. Treatments were replicated four times in a randomized complete block design. Treatments were made as soil drenches in 4 ozs of water per plant on 28 Mar. The number of whitefly adults was counted weekly on one top leaf of the middle 10 plants in each plot. The numbers of eggs, and first instar and second to fourth instar whitefly nymphs were counted weekly on each of 4, 3.5 cm leaf disks per each of 10 leaves per plot. The number of Liriomyza leafmines was counted by each of two persons during a one minute search of each plot on 1 and 10 May. The silverleaf whitefly population was high during the trial. Significantly fewer adults relative to the check were detected on 19 May for plots treated with Admire Pro at the 7 oz rate, Coragen and Platinum (Table 1). No differences in the numbers of whitefly eggs occurred for any treatment compared to the check on any date (Table 2). Significantly fewer first instars were observed on both 22 and 31 May on plants drenched with either Admire Pro at the 7.0 oz rate or Coragen compared to the check (Table 3). These two treatments also resulted in fewer sessile nymphs (second, third and fourth instars) relative to the check on 31 May (Table 4). The Liriomyza population was low during the trial and no treatment resulted in fewer leafmines compared to the check on 1 May, but all treatments resulted in fewer leafmines on 10 May (Table 5). No visible phytotoxicity was apparent with any other treatment. Table 1 No. silverleaf whitefly adults/10 leaves Rate Treatment/formulation* amt/acre 4 Apr 10 Apr 18 Apr 28 Apr 3 May 12 May 19 May Admire Pro 7.0 oz 0 1 1 17 15 51 149 Admire Pro 4.9 oz 0 2 1 15 10 59 159 Belay 18WSG 20.0 oz < 1 1 1 18 9 55 169 Coragen 20SC 4.9 oz 0 2 1 20 11 56 146 Platinum 2SC 8.0 oz 0 1 1 12 18 48 147 Check --- 0 3 2 14 17 43 175 LSD (P = 0.05) --- < 1 2 2 20 11 17 24 *A "+" indicates that products were combined. Table 2 No. silverleaf whitefly eggss/140 cm Rate Treatment/formulation* amt/acre 25 Apr 1 May 8 May 17 May 22 May Admire Pro 7.0 oz 222 161 38 88 850 Admire Pro 4.9 oz 221 353 55 126 1205 Belay 18WSG 20.0 oz 181 146 29 89 2192 Coragen 20SC 4.9 oz 278 113 24 120 835 Platinum 2SC 8.0 oz 129 177 85 167 1809 Check --- 273 61 40 190 1119 LSD (P = 0.05) --- 168 160 58 108 1170 *A "+" indicates that products were combined. Table 3 No. silverleaf whitefly first instars/140 cm Rate Treatment/Formulation* Amount/acre 25 Apr 1 May 8 May 17 May 22 May 31 May Admire Pro 7.0 oz 7 87 15 5 13 361 Admire Pro 4.9 oz 18 127 12 20 17 886 Belay 18WSG 20.0 oz 15 46 6 13 16 601 Coragen 20SC 4.9 oz 8 86 3 16 17 321 Platinum 2SC 8.0 oz 8 109 15 13 59 406 Check --- 5 52 6 18 57 1387 LSD (P = 0.05) --- 24 105 15 14 35 801 *A "+" indicates that products were combined. Table 4 No. silverleaf whitefly sessile nymphs/140 cm Rate Treatment/formulation* amt/acre 25 Apr 1 May 8 May 17 May 22 May 31 May Admire Pro 7.0 oz 2 3 1 3 3 69 Admire Pro 4.9 oz 1 12 1 6 2 154 Belay 18WSG 20.0 oz 0 5 14 5 2 127 Coragen 20SC 4.9 oz < 1 3 0 1 1 19 Platinum 2SC 8.0 oz 1 1 4 1 14 192 Check --- 1 0 13 5 7 190 LSD (P = 0.05) --- 3 7 16 7 9 109 *A "+" indicates that products were combined. Table 5 No. leafmines/2 min search Rate Treatment/formulation* amt/acre 1 May 10 May Admire Pro 7.0 oz 8 3 Admire Pro 4.9 oz 14 3 Belay 18WSG 20.0 oz 11 3 Coragen 20SC 4.9 oz 5 1 Platinum 2SC 8.0 oz 11 2 Check --- 13 6 LSD (P = 0.05) --- 9 3 *A "+" indicates that products were combined. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

SILVERLEAF WHITEFLY AND LEAFMINER MANAGEMENT ON SQUASH, SPRING 2006

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

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Oxford University Press
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© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/32.1.E45
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Abstract

(E45) SQUASH (YELLOW): Cucurbita pepo L., ‘Enterprise’ David J. Schuster Gulf Coast Res. & Educ. Ctr. 14625 CR 672 Wimauma, FL 33598 Phone: 813-633-4124 Fax: 813-634-0001 Email: dschust@ufl.edu Silverleaf whitefly: Bemisia argentifolii Bellows & Perring Leafminer: Liriomyza trifolii (Burgess) Transplants were set 28 Mar, 1.5 ft apart within the row on 8-inch-high and 32-inch-wide beds of Myakka fine sand covered with white polyethylene mulch. Each plot consisted of a single 21 ft-long row spaced 11 ft end to end and 10 ft apart. Treatments were replicated four times in a randomized complete block design. Treatments were made as soil drenches in 4 ozs of water per plant on 28 Mar. The number of whitefly adults was counted weekly on one top leaf of the middle 10 plants in each plot. The numbers of eggs, and first instar and second to fourth instar whitefly nymphs were counted weekly on each of 4, 3.5 cm leaf disks per each of 10 leaves per plot. The number of Liriomyza leafmines was counted by each of two persons during a one minute search of each plot on 1 and 10 May. The silverleaf whitefly population was high during the trial. Significantly fewer adults relative to the check were detected on 19 May for plots treated with Admire Pro at the 7 oz rate, Coragen and Platinum (Table 1). No differences in the numbers of whitefly eggs occurred for any treatment compared to the check on any date (Table 2). Significantly fewer first instars were observed on both 22 and 31 May on plants drenched with either Admire Pro at the 7.0 oz rate or Coragen compared to the check (Table 3). These two treatments also resulted in fewer sessile nymphs (second, third and fourth instars) relative to the check on 31 May (Table 4). The Liriomyza population was low during the trial and no treatment resulted in fewer leafmines compared to the check on 1 May, but all treatments resulted in fewer leafmines on 10 May (Table 5). No visible phytotoxicity was apparent with any other treatment. Table 1 No. silverleaf whitefly adults/10 leaves Rate Treatment/formulation* amt/acre 4 Apr 10 Apr 18 Apr 28 Apr 3 May 12 May 19 May Admire Pro 7.0 oz 0 1 1 17 15 51 149 Admire Pro 4.9 oz 0 2 1 15 10 59 159 Belay 18WSG 20.0 oz < 1 1 1 18 9 55 169 Coragen 20SC 4.9 oz 0 2 1 20 11 56 146 Platinum 2SC 8.0 oz 0 1 1 12 18 48 147 Check --- 0 3 2 14 17 43 175 LSD (P = 0.05) --- < 1 2 2 20 11 17 24 *A "+" indicates that products were combined. Table 2 No. silverleaf whitefly eggss/140 cm Rate Treatment/formulation* amt/acre 25 Apr 1 May 8 May 17 May 22 May Admire Pro 7.0 oz 222 161 38 88 850 Admire Pro 4.9 oz 221 353 55 126 1205 Belay 18WSG 20.0 oz 181 146 29 89 2192 Coragen 20SC 4.9 oz 278 113 24 120 835 Platinum 2SC 8.0 oz 129 177 85 167 1809 Check --- 273 61 40 190 1119 LSD (P = 0.05) --- 168 160 58 108 1170 *A "+" indicates that products were combined. Table 3 No. silverleaf whitefly first instars/140 cm Rate Treatment/Formulation* Amount/acre 25 Apr 1 May 8 May 17 May 22 May 31 May Admire Pro 7.0 oz 7 87 15 5 13 361 Admire Pro 4.9 oz 18 127 12 20 17 886 Belay 18WSG 20.0 oz 15 46 6 13 16 601 Coragen 20SC 4.9 oz 8 86 3 16 17 321 Platinum 2SC 8.0 oz 8 109 15 13 59 406 Check --- 5 52 6 18 57 1387 LSD (P = 0.05) --- 24 105 15 14 35 801 *A "+" indicates that products were combined. Table 4 No. silverleaf whitefly sessile nymphs/140 cm Rate Treatment/formulation* amt/acre 25 Apr 1 May 8 May 17 May 22 May 31 May Admire Pro 7.0 oz 2 3 1 3 3 69 Admire Pro 4.9 oz 1 12 1 6 2 154 Belay 18WSG 20.0 oz 0 5 14 5 2 127 Coragen 20SC 4.9 oz < 1 3 0 1 1 19 Platinum 2SC 8.0 oz 1 1 4 1 14 192 Check --- 1 0 13 5 7 190 LSD (P = 0.05) --- 3 7 16 7 9 109 *A "+" indicates that products were combined. Table 5 No. leafmines/2 min search Rate Treatment/formulation* amt/acre 1 May 10 May Admire Pro 7.0 oz 8 3 Admire Pro 4.9 oz 14 3 Belay 18WSG 20.0 oz 11 3 Coragen 20SC 4.9 oz 5 1 Platinum 2SC 8.0 oz 11 2 Check --- 13 6 LSD (P = 0.05) --- 9 3 *A "+" indicates that products were combined.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2007

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