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CONTROL OF THE SILVERLEAF WHITEFLY WITH SOIL AND FOLIAR INSECTICIDE APPLICATIONS ON FRESH MARKET TOMATOES, FALL 2005

CONTROL OF THE SILVERLEAF WHITEFLY WITH SOIL AND FOLIAR INSECTICIDE APPLICATIONS ON FRESH MARKET... (E60) TOMATO: Lycopersicon esculentum Miller ‘Sun Leaper’ CONTROL OF THE SILVERLEAF WHITEFLY WITH SOIL AND FOLIAR INSECTICIDE APPLICATIONS ON FRESH MARKET TOMATOES, FALL 2005 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 On 8 Sep, transplants were set 18 inches apart on raised beds of Myakka fine sand soil covered with white virtually impermeable plastic mulch. Plots were three, 21 ft long rows with rows separated by 9 ft end to end and by 5 ft side to side. Plots were irrigated by a seepage sub-irrigation system. Treatments were replicated four times in a randomized complete block design. Admire Pro and Platinum were applied on 8 Sep to each plant in 4 oz of water. The remaining products were applied at the pre-determined density of five whitefly sessile nymphs and/or pupae/10 leaflets (Table 1). Foliar applications were made with a high clearance, self-propelled sprayer operated at 200 psi and 3.4 mph. It was fitted with eight Albuz orange nozzles per row and delivered 60 (4 nozzles open) or 90 (six nozzles open) gpa. 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 third leaf of two stems of each plant. The numbers of sessile nymphs (2nd, 3rd and 4th instars) were counted weekly on the terminal leaflet from the 7th - 8th leaf counting from the top of each plant. On 21 Jun, fruit were harvested from the middle 10 plants of the middle row of each plot. Fruit with zippering, cat-facing or blossom end rot were culled as defective and counted. The remaining fruit were graded for size by machine where extra large fruit were > 2.75 inches in diameter, large were 2.51 to 2.75 inches in diameter, medium were 2.26 to 2.5 inches in diameter and small were less than 2.5 inches in diameter. Small fruit were then included in the culls. Fruit in all size categories were counted and weighed. The silverleaf whitefly population was low throughout the season. Although significant differences in the numbers of adults relative to the check were detected on 12 Oct, 10, 18 and 24 Nov, the differences were small (Table 2). The numbers of sessile nymphs on foliage in all sprayed plots, except those sprayed with Agri-Mek, were significantly lower than that on foliage in check plots 4 days after the second application (Table 3). On 5 Dec, 2 days after the third foliar application (first for Courier 70W), fewer nymphs were observed on all foliarly treated plots, except for those treated with Agri-Mek, compared to the check. A significantly lower percentage of plants with symptoms of TYLCV were observed in the Admire Pro/Courier treatment compared to the check on 18, 23 Nov, 2 and 9 Dec (Table 4). No differences were detected with any other treatment. Soil drenches of Platinum resulted in more cull tomatoes compared to the check (Table 5). No other differences in yield were observed. No visible phytotoxicity was observed for any treatment. Table 1 Soil 60 gpa 90 gpa Treatment/ Rate application formulation* amt/acre 8 Sep 20 Oct 3 Nov 3 Dec Admire Pro 7.0 oz X then Courier 70W 0.5 lb X Agri-Mek 0.15EC 12.0 oz X X X Courier 40SC 13.6 oz X X N 215A 1.0% v/v X X X N 215B 1.0% v/v X X X Rimon 0.83EC 12.0 oz X X X + Induce 0.05% v/v X X X Platinum 2SC 11.0 oz X Platinum 2SC 8.0 oz X Check --- *A "+" indicates that products were combined. Table 2 No. silverleaf whitefly adults/20 leaves Treatment/ Rate formulation* amt/acre 28 Sep 5 Oct 12 Oct 19 Oct 26 Oct 3 Nov 10 Nov 18 Nov 24 Nov Admire Pro 7.0 oz then Courier 70W 0.5 lb 1 3 2 2 1 2 2 < 1 0 Agri-Mek 0.15EC 12.0 oz 2 2 3 1 1 3 1 1 1 Courier 40SC 13.6 oz 2 2 2 2 2 2 1 < 1 1 N 215A 1.0% v/v 1 1 < 1 3 2 1 2 1 1 N 215B 1.0% v/v 3 1 2 1 2 1 2 1 < 1 Rimon 0.83EC 12.0 oz + Induce 0.05% v/v 1 2 1 2 1 3 1 < 1 0 Platinum 2SC 11.0 oz 2 1 2 1 2 2 3 1 0 Platinum 2SC 8.0 oz 2 2 3 3 1 2 2 < 1 0 Check --- 2 1 3 2 2 1 3 2 1 LSD (P = 0.05) --- 3 2 2 2 2 2 2 1 1 *A "+" indicates that products were combined. Table 3 No. silverleaf whitefly sessile numphs/10 leaflets Treatment/ Rate formulation* amt/acre 10 Oct 17 Oct 26 Oct 31 Oct 7 Nov 14 Nov 22 Nov 28 Nov 5 Dec 12 Dec Admire Pro 7.0 oz then Courier 70W 0.5 lb < 1 0 1 1 6 4 4 5 1 3 Agri-Mek 0.15EC 12.0 oz 3 1 2 3 6 5 3 5 5 4 Courier 40SC 13.6 oz 3 1 0 0 0 0 1 3 3 4 N 215A 1.0% v/v 4 1 2 < 1 5 1 5 4 4 2 N 215B 1.0% v/v 2 1 2 1 2 1 2 6 4 3 Rimon 0.83EC 12.0 oz + Induce 0.05% v/v 3 3 7 3 4 1 4 2 2 3 Platinum 2SC 11.0 oz 1 0 2 0 3 4 7 12 6 - Platinum 2SC 8.0 oz 1 0 1 1 2 4 5 3 6 - Check --- 2 2 2 1 9 2 6 6 8 4 LSD (P = 0.05) --- 3 3 3 2 4 4 5 6 4 4 *A "+" indicates that products were combined. Table 4 % plants showing symptoms of TYLCV Treatment/ Rate formulation* amt/acre 5 Oct 12 Oct 19 Oct 26 Oct 4 Nov 10 Nov 18 Nov 23 Nov 2 Dec 9 Dec 16 Dec Admire Pro 7.0 oz then Courier 70W 0.5 lb 0.0 5.5 12.2 17.7 31.0 42.8 47.6 55.7 68.4 86.0 94.5 Agri-Mek 0.15EC 12.0 oz 3.9 11.2 25.2 35.0 54.3 68.3 80.5 83.5 88.2 96.2 97.0 Courier 40SC 13.6 oz 3.7 9.7 20.1 25.0 41.4 48.8 57.3 60.3 77.4 92.3 96.4 N 215A 1.0% v/v 1.3 5.8 15.3 25.8 45.0 62.6 76.3 80.8 91.1 96.8 98.7 N 215B 1.0% v/v 5.4 9.4 23.7 31.0 45.3 65.4 80.0 82.0 93.6 97.4 99.3 Rimon 0.83EC 12.0 oz + Induce 0.05% v/v 1.3 5.9 20.3 28.6 42.0 63.9 75.8 78.4 87.4 94.9 95.6 Platinum 2SC 11.0 oz 0.6 3.1 13.6 17.9 31.5 46.9 58.0 61.1 80.3 95.7 100.0 Platinum 2SC 8.0 oz 0.0 5.5 12.4 18.0 30.4 43.6 55.5 60.5 74.3 92.6 98.2 Check --- 1.3 5.4 16.6 22.0 41.4 61.5 71.6 76.5 89.7 97.3 99.4 LSD (P = 0.05) --- 4.2 8.7 14.4 17.1 18.5 20.3 19.4 19.4 18.1 8.9 5.3 *A "+" indicates that products were combined. Table 5 Yield/10 plants Culls Medium Large Extra-large Treatment/ Rate formulation* amt/acre No. Wt. (lb) No. Wt. (lb) No. Wt. (lb) No. Wt. (lb) Admire Pro 7.0 oz then Courier 70W 0.5 lb 26 5.7 50 14.0 40 15.1 50 22.1 Agri-Mek 0.15EC 12.0 oz 26 5.7 49 13.5 32 11.4 25 11.9 Courier 40SC 13.6 oz 26 6.2 45 12.5 32 10.8 38 18.5 N 215A 1.0% v/v 25 6.4 54 15.5 40 14.0 36 18.1 N-215B 1.0% v/v 18 3.7 38 10.7 22 10.0 36 17.9 Rimon 0.83EC 12.0 oz + Induce 0.05% v/v 33 7.3 51 14.4 30 12.3 41 18.8 Platinum 2SC 11.0 oz 34 8.4 58 15.8 42 14.9 45 21.6 Platinum 2SC 8.0 oz 37 7.7 45 12.5 44 15.1 42 20.4 Check --- 20 4.9 43 12.1 43 12.8 38 18.6 LSD (P = 0.05) --- 14 2.9 17 4.6 16 6.1 16 7.5 *A "+" indicates that products were combined. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF THE SILVERLEAF WHITEFLY WITH SOIL AND FOLIAR INSECTICIDE APPLICATIONS ON FRESH MARKET TOMATOES, FALL 2005

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

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10.1093/amt/32.1.E60
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Abstract

(E60) TOMATO: Lycopersicon esculentum Miller ‘Sun Leaper’ CONTROL OF THE SILVERLEAF WHITEFLY WITH SOIL AND FOLIAR INSECTICIDE APPLICATIONS ON FRESH MARKET TOMATOES, FALL 2005 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 On 8 Sep, transplants were set 18 inches apart on raised beds of Myakka fine sand soil covered with white virtually impermeable plastic mulch. Plots were three, 21 ft long rows with rows separated by 9 ft end to end and by 5 ft side to side. Plots were irrigated by a seepage sub-irrigation system. Treatments were replicated four times in a randomized complete block design. Admire Pro and Platinum were applied on 8 Sep to each plant in 4 oz of water. The remaining products were applied at the pre-determined density of five whitefly sessile nymphs and/or pupae/10 leaflets (Table 1). Foliar applications were made with a high clearance, self-propelled sprayer operated at 200 psi and 3.4 mph. It was fitted with eight Albuz orange nozzles per row and delivered 60 (4 nozzles open) or 90 (six nozzles open) gpa. 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 third leaf of two stems of each plant. The numbers of sessile nymphs (2nd, 3rd and 4th instars) were counted weekly on the terminal leaflet from the 7th - 8th leaf counting from the top of each plant. On 21 Jun, fruit were harvested from the middle 10 plants of the middle row of each plot. Fruit with zippering, cat-facing or blossom end rot were culled as defective and counted. The remaining fruit were graded for size by machine where extra large fruit were > 2.75 inches in diameter, large were 2.51 to 2.75 inches in diameter, medium were 2.26 to 2.5 inches in diameter and small were less than 2.5 inches in diameter. Small fruit were then included in the culls. Fruit in all size categories were counted and weighed. The silverleaf whitefly population was low throughout the season. Although significant differences in the numbers of adults relative to the check were detected on 12 Oct, 10, 18 and 24 Nov, the differences were small (Table 2). The numbers of sessile nymphs on foliage in all sprayed plots, except those sprayed with Agri-Mek, were significantly lower than that on foliage in check plots 4 days after the second application (Table 3). On 5 Dec, 2 days after the third foliar application (first for Courier 70W), fewer nymphs were observed on all foliarly treated plots, except for those treated with Agri-Mek, compared to the check. A significantly lower percentage of plants with symptoms of TYLCV were observed in the Admire Pro/Courier treatment compared to the check on 18, 23 Nov, 2 and 9 Dec (Table 4). No differences were detected with any other treatment. Soil drenches of Platinum resulted in more cull tomatoes compared to the check (Table 5). No other differences in yield were observed. No visible phytotoxicity was observed for any treatment. Table 1 Soil 60 gpa 90 gpa Treatment/ Rate application formulation* amt/acre 8 Sep 20 Oct 3 Nov 3 Dec Admire Pro 7.0 oz X then Courier 70W 0.5 lb X Agri-Mek 0.15EC 12.0 oz X X X Courier 40SC 13.6 oz X X N 215A 1.0% v/v X X X N 215B 1.0% v/v X X X Rimon 0.83EC 12.0 oz X X X + Induce 0.05% v/v X X X Platinum 2SC 11.0 oz X Platinum 2SC 8.0 oz X Check --- *A "+" indicates that products were combined. Table 2 No. silverleaf whitefly adults/20 leaves Treatment/ Rate formulation* amt/acre 28 Sep 5 Oct 12 Oct 19 Oct 26 Oct 3 Nov 10 Nov 18 Nov 24 Nov Admire Pro 7.0 oz then Courier 70W 0.5 lb 1 3 2 2 1 2 2 < 1 0 Agri-Mek 0.15EC 12.0 oz 2 2 3 1 1 3 1 1 1 Courier 40SC 13.6 oz 2 2 2 2 2 2 1 < 1 1 N 215A 1.0% v/v 1 1 < 1 3 2 1 2 1 1 N 215B 1.0% v/v 3 1 2 1 2 1 2 1 < 1 Rimon 0.83EC 12.0 oz + Induce 0.05% v/v 1 2 1 2 1 3 1 < 1 0 Platinum 2SC 11.0 oz 2 1 2 1 2 2 3 1 0 Platinum 2SC 8.0 oz 2 2 3 3 1 2 2 < 1 0 Check --- 2 1 3 2 2 1 3 2 1 LSD (P = 0.05) --- 3 2 2 2 2 2 2 1 1 *A "+" indicates that products were combined. Table 3 No. silverleaf whitefly sessile numphs/10 leaflets Treatment/ Rate formulation* amt/acre 10 Oct 17 Oct 26 Oct 31 Oct 7 Nov 14 Nov 22 Nov 28 Nov 5 Dec 12 Dec Admire Pro 7.0 oz then Courier 70W 0.5 lb < 1 0 1 1 6 4 4 5 1 3 Agri-Mek 0.15EC 12.0 oz 3 1 2 3 6 5 3 5 5 4 Courier 40SC 13.6 oz 3 1 0 0 0 0 1 3 3 4 N 215A 1.0% v/v 4 1 2 < 1 5 1 5 4 4 2 N 215B 1.0% v/v 2 1 2 1 2 1 2 6 4 3 Rimon 0.83EC 12.0 oz + Induce 0.05% v/v 3 3 7 3 4 1 4 2 2 3 Platinum 2SC 11.0 oz 1 0 2 0 3 4 7 12 6 - Platinum 2SC 8.0 oz 1 0 1 1 2 4 5 3 6 - Check --- 2 2 2 1 9 2 6 6 8 4 LSD (P = 0.05) --- 3 3 3 2 4 4 5 6 4 4 *A "+" indicates that products were combined. Table 4 % plants showing symptoms of TYLCV Treatment/ Rate formulation* amt/acre 5 Oct 12 Oct 19 Oct 26 Oct 4 Nov 10 Nov 18 Nov 23 Nov 2 Dec 9 Dec 16 Dec Admire Pro 7.0 oz then Courier 70W 0.5 lb 0.0 5.5 12.2 17.7 31.0 42.8 47.6 55.7 68.4 86.0 94.5 Agri-Mek 0.15EC 12.0 oz 3.9 11.2 25.2 35.0 54.3 68.3 80.5 83.5 88.2 96.2 97.0 Courier 40SC 13.6 oz 3.7 9.7 20.1 25.0 41.4 48.8 57.3 60.3 77.4 92.3 96.4 N 215A 1.0% v/v 1.3 5.8 15.3 25.8 45.0 62.6 76.3 80.8 91.1 96.8 98.7 N 215B 1.0% v/v 5.4 9.4 23.7 31.0 45.3 65.4 80.0 82.0 93.6 97.4 99.3 Rimon 0.83EC 12.0 oz + Induce 0.05% v/v 1.3 5.9 20.3 28.6 42.0 63.9 75.8 78.4 87.4 94.9 95.6 Platinum 2SC 11.0 oz 0.6 3.1 13.6 17.9 31.5 46.9 58.0 61.1 80.3 95.7 100.0 Platinum 2SC 8.0 oz 0.0 5.5 12.4 18.0 30.4 43.6 55.5 60.5 74.3 92.6 98.2 Check --- 1.3 5.4 16.6 22.0 41.4 61.5 71.6 76.5 89.7 97.3 99.4 LSD (P = 0.05) --- 4.2 8.7 14.4 17.1 18.5 20.3 19.4 19.4 18.1 8.9 5.3 *A "+" indicates that products were combined. Table 5 Yield/10 plants Culls Medium Large Extra-large Treatment/ Rate formulation* amt/acre No. Wt. (lb) No. Wt. (lb) No. Wt. (lb) No. Wt. (lb) Admire Pro 7.0 oz then Courier 70W 0.5 lb 26 5.7 50 14.0 40 15.1 50 22.1 Agri-Mek 0.15EC 12.0 oz 26 5.7 49 13.5 32 11.4 25 11.9 Courier 40SC 13.6 oz 26 6.2 45 12.5 32 10.8 38 18.5 N 215A 1.0% v/v 25 6.4 54 15.5 40 14.0 36 18.1 N-215B 1.0% v/v 18 3.7 38 10.7 22 10.0 36 17.9 Rimon 0.83EC 12.0 oz + Induce 0.05% v/v 33 7.3 51 14.4 30 12.3 41 18.8 Platinum 2SC 11.0 oz 34 8.4 58 15.8 42 14.9 45 21.6 Platinum 2SC 8.0 oz 37 7.7 45 12.5 44 15.1 42 20.4 Check --- 20 4.9 43 12.1 43 12.8 38 18.6 LSD (P = 0.05) --- 14 2.9 17 4.6 16 6.1 16 7.5 *A "+" indicates that products were combined.

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2007

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