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EFFICACY OF SELECTED INSECTICIDES AGAINST MELON PESTS ON CANTALOUPE, SPRING 2004

EFFICACY OF SELECTED INSECTICIDES AGAINST MELON PESTS ON CANTALOUPE, SPRING 2004 (E15) CANTALOUPE: Cucumis melo L., ‘Impac’ EFFICACY OF SELECTED INSECTICIDES AGAINST MELON PESTS ON CANTALOUPE, SPRING 2004 T.-X. Liu Texas A&M University Agricultural Research and Extension Center 2415 E. Highway 83 Weslaco, TX 78596 Phone: (956) 968-5585 Fax: (956) 968-0641 E-mail: Tx-liu@tamu.edu Leafminer: Liriomyza trifolii (Burgess) Vegetable leafminer: Liriomyza sativae (Blanchard) Sweetpotato whitefly: Bemisia tabaci (Gennadius) Melon aphid: Aphis gossypii Glover Flea beetles: Epitrix spp., Phyllotreta spp. Cucumber beetles: Diabrotica spp. Melonworm: Diaphania hyalinata (Linnaeus) Pepper weevil: Anthonomus eugenii Cano The objective of this study was to determine the effects of selected insecticide against leafminers, melon aphid, sweetpotato whitefly and other pests on cantaloupe. The test was conducted at the Texas A&M University Agricultural Research and Extension Center, Weslaco. Cantaloupe was seeded on 28 Jan 2004, and the seedlings were transplanted to the field on 26 Feb 2004. Each field plot was 30 ft long × 80 inch wide, and consisted of two rows of plants with a 1-ft spacing. The plots were separated with sorghum windbreaks and a 6-ft alleyway. All treatments were arranged in a RCB design with four replications. Treatments were applied on 1, 14 and 22 Apr using a tractor-mounted sprayer with three ceramic hollow cone nozzles per row (TX-10, one over the plants, two on drops) at 100 psi at a delivery rate of 30 gpa. Insects were sampled five times on 7, 13, 20 and 27 Apr and 6 May, and plant damage was estimated at termination. The number of leaves with mines on 10 plants in the middle of each plot were counted weekly until the end of the season. Other insects sampled included whiteflies, aphids, lepidopterous pests, natural enemies, and others. Three leaves from the middle of each of 10 plants per plot were sampled, and all insects counted. Plant foliage was estimated as: 0 = no damage, 1 = minor damage (1 - 20%), 2 = minor - moderate damage (21 - 40%), 3 = moderate damage (41 - 60%), 4 = moderate-heavy damage (61 - 80%) and 5 = heavy damage (81 - 100%). Data were subjected to ANOVA and means were separated using LSD (P ≤ 0.05). Pests encountered included sweetpotato whitefly, melon aphid, onion thrips, flea beetles, cucumber beetles, melonworms, and others. Seasonal overall numbers of insect pests on melon plants varied greatly and were significantly different (Table 1). The plants in the untreated check had significantly more pests than those treated with an insecticide. Of the treatments, plants treated with Agri-Mek, Diamond, Trigard, and Koromite were most effective, followed by other treatments. Overall numbers of sweetpotato whitefly adults on cantaloupe leaves in the season differed greatly among the treatments. Generally, untreated plants and the plants treated with Trigard and Proclaim had similar numbers of sweetpotato whitefly adults. Plants treated with Diamond, Agri-Mek and Clutch had fewer whiteflies than other treatments. Numbers of leafminers were significantly different among the treatments, and there were fewer leafminers on the plants treated with all insecticide treatments compared with those in untreated control with the exception of Clutch. Of the treatments, Agri-Mek, Diamond and Trigard were most effective. Generally, the untreated check and the treatments of Clutch had more leafminers than other treatments. Foliar damage ratings by sweetpotato whitefly, in term of sooty mold and honeydew, were significantly different among the treatments. Untreated plants had the most damage. Of the insecticide treatments, Agri-Mek, Clutch and Diamond had less damage compared with other insecticide treatments, although the differences were not always significant. Foliar damage ratings by leafminers, or leafmines on leaves, were significantly different among the treatments, and untreated plants and the plants treated with Proclaim had the most leafmines. Of the insecticide treatments, Trigard, Agri-Mek, Clutch and Diamond had fewer leafmines compared with other insecticide treatments, although the differences were not always significant. Both numbers of melons in each size category and weight of each melon harvested from each plot was not significantly different among all treatments. Melon soluble solid concentrations (%) were significantly different among the treatments, and the melons harvested from the untreated plots had the lowest concentrations of soluble solid compared with all other insecticide treatments, Diamond, Trigard, Proclaim, and Clutch had fewer pepper weevils than other insecticide treatments. Whitefly Treatments/ Rate amt Leafmines Leafminers Whitefly damage Overall % formulation product/acre All pests/leaf / leaf /leaf adults/leaf (sooty mold) soluble solid Clutch 50WDG 1.6 oz 3.52b 1.50ab 1.43de 1.53d 2.90b 6.6bc Koromite 1% EC 3.84 fl oz 3.40bc 1.22d 1.70cd 1.60d 2.88b 6.9a Diamond 0.83EC 12 fl oz 2.67d 0.94e 1.9bc 2.30b 2.55cd 6.8ab Stakle 20SG 8 oz 3.68b 1.60ab 2.20b 2.20bc 2.35d 6.7abc Avaunt 30WG 3.47 oz 3.65b 1.48bc 2.60a 2.28bc 2.78bc 6.7abc Agri-Mek 0.15EC 16 fl oz 2.51d 0.68f 1.38e 1.75d 2.68bc 6.7abc Trigard 75WP 2.66 oz 3.08c 0.92e 0.83f 2.03c 2.80bc 6.8ab Proclaim 5WDG 3.2 oz 3.70b 1.33cd 2.60a 2.33b 2.73bc 6.5c Untreated check -- 4.05a 1.64a 2.75a 2.63a 3.48a 5.0d Means in the same column followed by the same letter do not differ significantly (P > 0.05, LSD). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFICACY OF SELECTED INSECTICIDES AGAINST MELON PESTS ON CANTALOUPE, SPRING 2004

Arthropod Management Tests , Volume 30 (1) – Jan 1, 2005

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Abstract

(E15) CANTALOUPE: Cucumis melo L., ‘Impac’ EFFICACY OF SELECTED INSECTICIDES AGAINST MELON PESTS ON CANTALOUPE, SPRING 2004 T.-X. Liu Texas A&M University Agricultural Research and Extension Center 2415 E. Highway 83 Weslaco, TX 78596 Phone: (956) 968-5585 Fax: (956) 968-0641 E-mail: Tx-liu@tamu.edu Leafminer: Liriomyza trifolii (Burgess) Vegetable leafminer: Liriomyza sativae (Blanchard) Sweetpotato whitefly: Bemisia tabaci (Gennadius) Melon aphid: Aphis gossypii Glover Flea beetles: Epitrix spp., Phyllotreta spp. Cucumber beetles: Diabrotica spp. Melonworm: Diaphania hyalinata (Linnaeus) Pepper weevil: Anthonomus eugenii Cano The objective of this study was to determine the effects of selected insecticide against leafminers, melon aphid, sweetpotato whitefly and other pests on cantaloupe. The test was conducted at the Texas A&M University Agricultural Research and Extension Center, Weslaco. Cantaloupe was seeded on 28 Jan 2004, and the seedlings were transplanted to the field on 26 Feb 2004. Each field plot was 30 ft long × 80 inch wide, and consisted of two rows of plants with a 1-ft spacing. The plots were separated with sorghum windbreaks and a 6-ft alleyway. All treatments were arranged in a RCB design with four replications. Treatments were applied on 1, 14 and 22 Apr using a tractor-mounted sprayer with three ceramic hollow cone nozzles per row (TX-10, one over the plants, two on drops) at 100 psi at a delivery rate of 30 gpa. Insects were sampled five times on 7, 13, 20 and 27 Apr and 6 May, and plant damage was estimated at termination. The number of leaves with mines on 10 plants in the middle of each plot were counted weekly until the end of the season. Other insects sampled included whiteflies, aphids, lepidopterous pests, natural enemies, and others. Three leaves from the middle of each of 10 plants per plot were sampled, and all insects counted. Plant foliage was estimated as: 0 = no damage, 1 = minor damage (1 - 20%), 2 = minor - moderate damage (21 - 40%), 3 = moderate damage (41 - 60%), 4 = moderate-heavy damage (61 - 80%) and 5 = heavy damage (81 - 100%). Data were subjected to ANOVA and means were separated using LSD (P ≤ 0.05). Pests encountered included sweetpotato whitefly, melon aphid, onion thrips, flea beetles, cucumber beetles, melonworms, and others. Seasonal overall numbers of insect pests on melon plants varied greatly and were significantly different (Table 1). The plants in the untreated check had significantly more pests than those treated with an insecticide. Of the treatments, plants treated with Agri-Mek, Diamond, Trigard, and Koromite were most effective, followed by other treatments. Overall numbers of sweetpotato whitefly adults on cantaloupe leaves in the season differed greatly among the treatments. Generally, untreated plants and the plants treated with Trigard and Proclaim had similar numbers of sweetpotato whitefly adults. Plants treated with Diamond, Agri-Mek and Clutch had fewer whiteflies than other treatments. Numbers of leafminers were significantly different among the treatments, and there were fewer leafminers on the plants treated with all insecticide treatments compared with those in untreated control with the exception of Clutch. Of the treatments, Agri-Mek, Diamond and Trigard were most effective. Generally, the untreated check and the treatments of Clutch had more leafminers than other treatments. Foliar damage ratings by sweetpotato whitefly, in term of sooty mold and honeydew, were significantly different among the treatments. Untreated plants had the most damage. Of the insecticide treatments, Agri-Mek, Clutch and Diamond had less damage compared with other insecticide treatments, although the differences were not always significant. Foliar damage ratings by leafminers, or leafmines on leaves, were significantly different among the treatments, and untreated plants and the plants treated with Proclaim had the most leafmines. Of the insecticide treatments, Trigard, Agri-Mek, Clutch and Diamond had fewer leafmines compared with other insecticide treatments, although the differences were not always significant. Both numbers of melons in each size category and weight of each melon harvested from each plot was not significantly different among all treatments. Melon soluble solid concentrations (%) were significantly different among the treatments, and the melons harvested from the untreated plots had the lowest concentrations of soluble solid compared with all other insecticide treatments, Diamond, Trigard, Proclaim, and Clutch had fewer pepper weevils than other insecticide treatments. Whitefly Treatments/ Rate amt Leafmines Leafminers Whitefly damage Overall % formulation product/acre All pests/leaf / leaf /leaf adults/leaf (sooty mold) soluble solid Clutch 50WDG 1.6 oz 3.52b 1.50ab 1.43de 1.53d 2.90b 6.6bc Koromite 1% EC 3.84 fl oz 3.40bc 1.22d 1.70cd 1.60d 2.88b 6.9a Diamond 0.83EC 12 fl oz 2.67d 0.94e 1.9bc 2.30b 2.55cd 6.8ab Stakle 20SG 8 oz 3.68b 1.60ab 2.20b 2.20bc 2.35d 6.7abc Avaunt 30WG 3.47 oz 3.65b 1.48bc 2.60a 2.28bc 2.78bc 6.7abc Agri-Mek 0.15EC 16 fl oz 2.51d 0.68f 1.38e 1.75d 2.68bc 6.7abc Trigard 75WP 2.66 oz 3.08c 0.92e 0.83f 2.03c 2.80bc 6.8ab Proclaim 5WDG 3.2 oz 3.70b 1.33cd 2.60a 2.33b 2.73bc 6.5c Untreated check -- 4.05a 1.64a 2.75a 2.63a 3.48a 5.0d Means in the same column followed by the same letter do not differ significantly (P > 0.05, LSD).

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2005

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