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TWOSPOTTED SPIDER MITE CONTROL ON CANTALOUPE, 2004

TWOSPOTTED SPIDER MITE CONTROL ON CANTALOUPE, 2004 (E20) CANTALOUPE: Cucumis melo L., ‘Athena’ Alton N. Sparks, Jr. Georgia Cooperative Extension Service P.O. Box 1209 Tifton, GA 31793 Phone: (229) 386-3424 Fax: (229) 386-7133 E-mail: asparks@uga.edu Keith Rucker Georgia Cooperative Extension Service P.O. Box 7548 Tifton, GA 31793 Twospotted spider mite: Tetranychus urticae Koch The trial was conducted in a commercial cantaloupe field in Tift County, Georgia. Plots were three rows wide (on 6-ft centers) by 25 ft. Experimental design was a RCB with four replications. Applications were made on 14 May, with a CO -pressurized backpack sprayer (60 psi; 30 gpa; 4 hollow cone nozzles per row). All tested pesticides were tank mixed with Flood at 4 oz/100 gal of spray. The grower over-sprayed the test prior to the 7 DAT counts with Kelthane (mites at 7 DAT were obviously alive but not healthy). Mites were sampled on five leaves per plot on each sample date. Leaves were selected based on the presence of mite damage. Leaves were taken back to the laboratory and examined under a dissecting scope. A single “infested” microscope field of each leaf was selected and all live mites and mite eggs counted (sample area was 1.8 cm diameter). An efficacy rating was conducted on the appearance of the plots, with each plot rated as follows: 1 = excellent control, little or no “fresh” damage; 2 = good control, damage scattered through plot; 3 = suppression, obvious damage throughout plot; 4 = damage throughout plot, heavy damage in spots; 5 = heavy damage throughout plot. Data were subjected to ANOVA and means were separated using LSD (P ≤ 0.05). Agri-Mek appeared to provide the best control (based on efficacy ratings). Oberon, Zeal, Kelthane, and Acramite provided good to excellent control of spider mites. The activity of Zeal resulted in an increase in egg densities. Eggs in this treatment apparently were not hatching, as mite counts did not increase, but these eggs appeared normal. Capture provided fair to poor control of mites in this test. Savey provided very poor activity in this test; however, given its mode of action and the relative short duration of this test, this would be expected. b Mites per field Eggs per field Efficacy rating Treatment/ Rate formulation lb (AI)/acre 3 DAT 7 DAT 3 DAT 7 DAT 7 DAT 13 DAT Untreated check --- 52.8a 43.3a 14.1b 9.3b 4.25a 4.00a Savey 50DF 0.094 54.3a 29.2b 13.0b 7.7bc 4.00ab 3.88a Capture 2EC 0.1 28.2b 19.6c 12.1b 2.6cd 2.25 d 2.13b Agri-Mek 0.15EC 0.014 27.2b 11.3d 10.5b 2.3cd 1.50d 1.25c Acramite 50WS 0.375 25.9b 10.3d 7.8b 1.0d 2.50cd 2.38b Kelthane 50WP 0.5 35.6b 10.2d 11.8b 2.4cd 2.50cd 2.25b Zeal 72WDG 0.09 33.4b 7.0d 23.6a 16.4a 3.25abc 2.75b Oberon 2SC 0.13 27.5b 5.0d 14.2b 6.1bcd 3.00bc 2.38b Means within columns followed by the same letter are not significantly different (P > 0.05, LSD). All tested pesticides were tank mixed with Flood at 4 oz/100 gal of spray. Efficacy rating: 1 = excellent control, little or no “fresh” damage; 2 = good control, damage scattered through plot; 3 = suppression, obvious damage throughout plot; 4 = damage throughout plot, heavy damage in spots; 5 = heavy damage throughout plot. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

TWOSPOTTED SPIDER MITE CONTROL ON CANTALOUPE, 2004

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

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.1093/amt/30.1.E20
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Abstract

(E20) CANTALOUPE: Cucumis melo L., ‘Athena’ Alton N. Sparks, Jr. Georgia Cooperative Extension Service P.O. Box 1209 Tifton, GA 31793 Phone: (229) 386-3424 Fax: (229) 386-7133 E-mail: asparks@uga.edu Keith Rucker Georgia Cooperative Extension Service P.O. Box 7548 Tifton, GA 31793 Twospotted spider mite: Tetranychus urticae Koch The trial was conducted in a commercial cantaloupe field in Tift County, Georgia. Plots were three rows wide (on 6-ft centers) by 25 ft. Experimental design was a RCB with four replications. Applications were made on 14 May, with a CO -pressurized backpack sprayer (60 psi; 30 gpa; 4 hollow cone nozzles per row). All tested pesticides were tank mixed with Flood at 4 oz/100 gal of spray. The grower over-sprayed the test prior to the 7 DAT counts with Kelthane (mites at 7 DAT were obviously alive but not healthy). Mites were sampled on five leaves per plot on each sample date. Leaves were selected based on the presence of mite damage. Leaves were taken back to the laboratory and examined under a dissecting scope. A single “infested” microscope field of each leaf was selected and all live mites and mite eggs counted (sample area was 1.8 cm diameter). An efficacy rating was conducted on the appearance of the plots, with each plot rated as follows: 1 = excellent control, little or no “fresh” damage; 2 = good control, damage scattered through plot; 3 = suppression, obvious damage throughout plot; 4 = damage throughout plot, heavy damage in spots; 5 = heavy damage throughout plot. Data were subjected to ANOVA and means were separated using LSD (P ≤ 0.05). Agri-Mek appeared to provide the best control (based on efficacy ratings). Oberon, Zeal, Kelthane, and Acramite provided good to excellent control of spider mites. The activity of Zeal resulted in an increase in egg densities. Eggs in this treatment apparently were not hatching, as mite counts did not increase, but these eggs appeared normal. Capture provided fair to poor control of mites in this test. Savey provided very poor activity in this test; however, given its mode of action and the relative short duration of this test, this would be expected. b Mites per field Eggs per field Efficacy rating Treatment/ Rate formulation lb (AI)/acre 3 DAT 7 DAT 3 DAT 7 DAT 7 DAT 13 DAT Untreated check --- 52.8a 43.3a 14.1b 9.3b 4.25a 4.00a Savey 50DF 0.094 54.3a 29.2b 13.0b 7.7bc 4.00ab 3.88a Capture 2EC 0.1 28.2b 19.6c 12.1b 2.6cd 2.25 d 2.13b Agri-Mek 0.15EC 0.014 27.2b 11.3d 10.5b 2.3cd 1.50d 1.25c Acramite 50WS 0.375 25.9b 10.3d 7.8b 1.0d 2.50cd 2.38b Kelthane 50WP 0.5 35.6b 10.2d 11.8b 2.4cd 2.50cd 2.25b Zeal 72WDG 0.09 33.4b 7.0d 23.6a 16.4a 3.25abc 2.75b Oberon 2SC 0.13 27.5b 5.0d 14.2b 6.1bcd 3.00bc 2.38b Means within columns followed by the same letter are not significantly different (P > 0.05, LSD). All tested pesticides were tank mixed with Flood at 4 oz/100 gal of spray. Efficacy rating: 1 = excellent control, little or no “fresh” damage; 2 = good control, damage scattered through plot; 3 = suppression, obvious damage throughout plot; 4 = damage throughout plot, heavy damage in spots; 5 = heavy damage throughout plot.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2005

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