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EVALUATION OF NEW INSECTICIDES FOR BOLLWORM CONTROL IN COTTON, 2011

EVALUATION OF NEW INSECTICIDES FOR BOLLWORM CONTROL IN COTTON, 2011 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F47 (F47) COTTON: Gossypium hirsutum L., ‘NexGen 4111RF’ D. L. Kerns Texas AgriLife Extension Service Department of Entomology Lubbock, TX 79403 Phone: (806) 746-4045 Fax: (806) 746-4057 Email: dlkerns@ag.tamu.edu S. A. Russell Texas AgriLife Extension Service Terry/Yoakum counties Brownfield, TX 79316 Phone: (806) 637-4060 Fax: (806) 637-2588 Email: rarussel@ag.tamu.edu B. A. Baugh Texas AgriLife Extension Service Lubbock County Lubbock, TX 79408 Phone: (806) 775-1680 Fax: (806) 435-1658 Email: bbaugh@ag.tamu.edu D. R. Patman Texas AgriLife Extension Service Crosby/Floyd counties Crosbyton, TX 79408 Phone: (806) 675-2426 Fax: (806) 675-2348 Email: drpatman@ag.tamu.edu B. J. Kesey Texas AgriLife Extension Service Department of Entomology Lubbock, TX 79403 Phone: (806) 746-4045 Fax: (806) 746-4057 Email: dlkerns@ag.tamu.edu Bollworm (BW): Helicoverpa zea (Boddie) This test was conducted in a commercial cotton field near Brownfield, TX. The field was planted on approximately 15 May on 40- inch rows, and was irrigated using a pivot irrigation system. The test was a RCB design with four replications. Plots were 4-rows wide × 50 ft long. Insecticides were applied with a CO pressurized hand-boom sprayer calibrated to deliver 10 gpa through TX-6 hollow cone nozzles (2 per row) at 40 psi on 28 Jul. Insecticides were applied to all four rows of each plot on 27 Aug. Treatments were evaluated by counting the number of small (< 0.25 inch), medium (0.25-0.625 inch) and large (> 0.625 inch) bollworm larvae per 20 whole plant samples from the middle two rows of each plot. A pretreatment evaluation was made on 27 Jul, and then on 1 and 4 Aug. In addition to larval counts, the number of damaged fruit was counted from the same 20 plants. Data were analyzed using ANOVA, and means were separated using an F-protected LSD (P ≤ 0.05). Before the insecticide applications on 27 Jul, there were no significant differences in any size or total BW among treatments (Table 1), nor were there any differences for damaged fruit (Table 2). At this time, small larvae predominated. At 4 DAT we could not detect any differences among treatments for BWs (Table 1), but all of the treatments had fewer damaged fruit than the untreated except the high rate of Benevia (Table 2). The reason for this is uncertain. By 7 DAT, Benevia and Ammo had fewer total BWs than the untreated, but differences in damaged fruit could not be detected (Table 2). Blackhawk and Belt appear to be less effective against 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F47 BWs in cotton than Benevia and Ammo. No phytotoxicity from any insecticide was observed in this test. This research was supported by industry gifts of products and research funding. Table 1. Number of BW larvae per 20 plants 27 Jul (pre-treatment) 1 Aug (4 DAT) Treatment/ Rate amt product/acre small medium large total small medium large total formulation Untreated -- 2.00a 1.75a 0.50a 4.25a 1.50a 1.00abc 1.50a 4.00a Blackhawk 36WG 2.5 oz 3.50a 1.00a 1.50a 6.00a 1.00a 2.00a 0.50a 3.50a Blackhawk 36WG 3.3 oz 4.00a 1.25a 1.25a 6.50a 0.50a 1.50ab 1.50a 3.50a Belt 4SC 3.0 fl-oz 1.25a 3.00a 1.25a 5.50a 0.75a 0.75bc 1.00a 2.50a Benevia 10OD 6.75 fl-oz 0.25a 1.25a 1.00a 2.50a 0.75a 0.25c 1.00a 2.00a Benevia 10OD 10.1 fl-oz 2.00a 2.50a 1.75a 6.25a 0.25a 1.00abc 0.50a 1.75a Benevia 10OD 13.5 fl-oz 1.75a 2.00a 0.50a 4.25a 1.25a 1.00abc 0.75a 3.00a Ammo 2.5EC 5.0 fl-oz 3.25a 0.75a 0.25a 4.25a 0.25a 0.00c 0.25a 0.50a Values in a column followed by the same letter are not different (ANOVA, Pprotected LSD; P ≥ 0.05) All treatments included the non-ionic surfactant Dyne-Amic at 0.25% v/v except Benevia which included the non-ionic oil and buffering adjuvant, Penetrator Plus at 2% v/v (spray solution, pH = 6). Table 2. Number of BW larvae per 20 plants No. damaged fruit per 20 plants 4 Aug (7 DAT) Treatment/ Rate amt 27 Jul 1 Aug 4 Aug formulation product/acre small medium large total (pre) (4 DAT) (7 DAT) Untreated -- 0.50a 1.50a 2.75a 4.75a 15.8a 25.5a 23.5a Blackhawk 36WG 2.5 oz 0.00a 1.25a 1.50a 2.75ab 18.0a 13.5bc 12.5a Blackhawk 36WG 3.3 oz 0.00a 1.75a 1.50a 3.25ab 24.8a 13.0bc 13.8a Belt 4SC 3.0 fl-oz 0.50a 1.50a 1.25a 3.25ab 15.0a 11.0bc 17.5a Benevia 10OD 6.75 fl-oz 0.00a 0.25a 0.50a 0.75b 12.3a 11.5bc 12.8a Benevia 10OD 10.1 fl-oz 0.00a 0.75a 0.50a 1.25b 20.0a 9.0bc 9.5a Benevia 10OD 13.5 fl-oz 0.00a 0.25a 0.50a 0.75b 12.8a 17.0ab 4.8a Ammo 2.5EC 5.0 fl-oz 0.25a 0.25a 0.50a 1.00b 16.5a 6.0c 11.5a Values in a column followed by the same letter are not different (ANOVA and protected LSD: P ≥ 0.05) All treatments included the non-ionic surfactant Dyne-Amic at 0.25% v/v except Benevia which included the non-ionic oil and buffering adjuvant, Penetrator Plus at 2% v/v (spray solution, pH = 6). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF NEW INSECTICIDES FOR BOLLWORM CONTROL IN COTTON, 2011

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Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F47 (F47) COTTON: Gossypium hirsutum L., ‘NexGen 4111RF’ D. L. Kerns Texas AgriLife Extension Service Department of Entomology Lubbock, TX 79403 Phone: (806) 746-4045 Fax: (806) 746-4057 Email: dlkerns@ag.tamu.edu S. A. Russell Texas AgriLife Extension Service Terry/Yoakum counties Brownfield, TX 79316 Phone: (806) 637-4060 Fax: (806) 637-2588 Email: rarussel@ag.tamu.edu B. A. Baugh Texas AgriLife Extension Service Lubbock County Lubbock, TX 79408 Phone: (806) 775-1680 Fax: (806) 435-1658 Email: bbaugh@ag.tamu.edu D. R. Patman Texas AgriLife Extension Service Crosby/Floyd counties Crosbyton, TX 79408 Phone: (806) 675-2426 Fax: (806) 675-2348 Email: drpatman@ag.tamu.edu B. J. Kesey Texas AgriLife Extension Service Department of Entomology Lubbock, TX 79403 Phone: (806) 746-4045 Fax: (806) 746-4057 Email: dlkerns@ag.tamu.edu Bollworm (BW): Helicoverpa zea (Boddie) This test was conducted in a commercial cotton field near Brownfield, TX. The field was planted on approximately 15 May on 40- inch rows, and was irrigated using a pivot irrigation system. The test was a RCB design with four replications. Plots were 4-rows wide × 50 ft long. Insecticides were applied with a CO pressurized hand-boom sprayer calibrated to deliver 10 gpa through TX-6 hollow cone nozzles (2 per row) at 40 psi on 28 Jul. Insecticides were applied to all four rows of each plot on 27 Aug. Treatments were evaluated by counting the number of small (< 0.25 inch), medium (0.25-0.625 inch) and large (> 0.625 inch) bollworm larvae per 20 whole plant samples from the middle two rows of each plot. A pretreatment evaluation was made on 27 Jul, and then on 1 and 4 Aug. In addition to larval counts, the number of damaged fruit was counted from the same 20 plants. Data were analyzed using ANOVA, and means were separated using an F-protected LSD (P ≤ 0.05). Before the insecticide applications on 27 Jul, there were no significant differences in any size or total BW among treatments (Table 1), nor were there any differences for damaged fruit (Table 2). At this time, small larvae predominated. At 4 DAT we could not detect any differences among treatments for BWs (Table 1), but all of the treatments had fewer damaged fruit than the untreated except the high rate of Benevia (Table 2). The reason for this is uncertain. By 7 DAT, Benevia and Ammo had fewer total BWs than the untreated, but differences in damaged fruit could not be detected (Table 2). Blackhawk and Belt appear to be less effective against 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F47 BWs in cotton than Benevia and Ammo. No phytotoxicity from any insecticide was observed in this test. This research was supported by industry gifts of products and research funding. Table 1. Number of BW larvae per 20 plants 27 Jul (pre-treatment) 1 Aug (4 DAT) Treatment/ Rate amt product/acre small medium large total small medium large total formulation Untreated -- 2.00a 1.75a 0.50a 4.25a 1.50a 1.00abc 1.50a 4.00a Blackhawk 36WG 2.5 oz 3.50a 1.00a 1.50a 6.00a 1.00a 2.00a 0.50a 3.50a Blackhawk 36WG 3.3 oz 4.00a 1.25a 1.25a 6.50a 0.50a 1.50ab 1.50a 3.50a Belt 4SC 3.0 fl-oz 1.25a 3.00a 1.25a 5.50a 0.75a 0.75bc 1.00a 2.50a Benevia 10OD 6.75 fl-oz 0.25a 1.25a 1.00a 2.50a 0.75a 0.25c 1.00a 2.00a Benevia 10OD 10.1 fl-oz 2.00a 2.50a 1.75a 6.25a 0.25a 1.00abc 0.50a 1.75a Benevia 10OD 13.5 fl-oz 1.75a 2.00a 0.50a 4.25a 1.25a 1.00abc 0.75a 3.00a Ammo 2.5EC 5.0 fl-oz 3.25a 0.75a 0.25a 4.25a 0.25a 0.00c 0.25a 0.50a Values in a column followed by the same letter are not different (ANOVA, Pprotected LSD; P ≥ 0.05) All treatments included the non-ionic surfactant Dyne-Amic at 0.25% v/v except Benevia which included the non-ionic oil and buffering adjuvant, Penetrator Plus at 2% v/v (spray solution, pH = 6). Table 2. Number of BW larvae per 20 plants No. damaged fruit per 20 plants 4 Aug (7 DAT) Treatment/ Rate amt 27 Jul 1 Aug 4 Aug formulation product/acre small medium large total (pre) (4 DAT) (7 DAT) Untreated -- 0.50a 1.50a 2.75a 4.75a 15.8a 25.5a 23.5a Blackhawk 36WG 2.5 oz 0.00a 1.25a 1.50a 2.75ab 18.0a 13.5bc 12.5a Blackhawk 36WG 3.3 oz 0.00a 1.75a 1.50a 3.25ab 24.8a 13.0bc 13.8a Belt 4SC 3.0 fl-oz 0.50a 1.50a 1.25a 3.25ab 15.0a 11.0bc 17.5a Benevia 10OD 6.75 fl-oz 0.00a 0.25a 0.50a 0.75b 12.3a 11.5bc 12.8a Benevia 10OD 10.1 fl-oz 0.00a 0.75a 0.50a 1.25b 20.0a 9.0bc 9.5a Benevia 10OD 13.5 fl-oz 0.00a 0.25a 0.50a 0.75b 12.8a 17.0ab 4.8a Ammo 2.5EC 5.0 fl-oz 0.25a 0.25a 0.50a 1.00b 16.5a 6.0c 11.5a Values in a column followed by the same letter are not different (ANOVA and protected LSD: P ≥ 0.05) All treatments included the non-ionic surfactant Dyne-Amic at 0.25% v/v except Benevia which included the non-ionic oil and buffering adjuvant, Penetrator Plus at 2% v/v (spray solution, pH = 6).

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2012

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