Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

EVALUATION OF INSECTICIDES FOR CONTROL OF KURTOMATHRIPS MORRILLI IN COTTON, 2011

EVALUATION OF INSECTICIDES FOR CONTROL OF KURTOMATHRIPS MORRILLI IN COTTON, 2011 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F50 (F50) COTTON: Gossypium hirsutum L., ‘Phytogen 367WRF’ 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 M. G. Anderson Texas AgriLife Extension Service Gaines County Seminole, TX 79360 Phone: (432) 758-8193 Fax: (432) 758-4031 Email: mganderson@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. A. Baugh Texas AgriLife Extension Service Lubbock County Lubbock, TX 79408 Phone: (806) 775-1680 Fax: (806) 435-1658 Email: bbaugh@ag.tamu.edu B. J. Kesey Texas AgriLife Extension Service Email: rjkesey@ag.tamu.edu Thrips: Kurtomathrips morrilli Moulton Three tests were conducted in a commercial cotton fields grown near Seminole, TX. The fields were on 36 or 40-inch rows, and were irrigated using a pivot irrigation system. All three tests were planted with the same variety, Phytogen 367WRF. All the tests were RCBD 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. Insecticides were applied to all four rows of each plot. Treatments were evaluated by collecting 5 or 10 leaves into 1-pt jars containing a 30% isopropyl alcohol solution. The jars were returned to the laboratory where the thrips were vacuum filtered onto filter paper and then counted using a stereo dissecting scope. On two tests, the middle two rows of each plot were harvested using a mechanized cotton stripper with integrated scales. Grab samples were ginned for turn out and quality. Data were analyzed using ANOVA and means were separated using an F-protected LSD (P ≤ 0.05). At Test Site 1, the thrips population was very high averaging, 136 thrips per leaf prior to spraying on 25 Jul (Table 1). At 3 days after treatment (DAT), the thrips numbers were highly variable among treatments and plots and there were no significant differences between treatments. However, for immature and total thrips at 7 DAT, Intruder at the fewest thrips, but did not differ from Orthene or Trimax Pro. Neither Radiant nor Tracer differed from the untreated. By 15 Aug the thrips population had declined across the entire test and all the insecticide treatments had fewer thrips than the untreated. At Test Site 2, the thrips population was averaged approximately 23 thrips per leaf when the test was initiated on 17 Aug (Table 2). At 7, 12, and 21 DAT, all of the products and rates evaluated had fewer thrips than the untreated, but there were no differences among the insecticides. Significant differences in yield were detected in this test. Centric at 1.8 oz had the highest yield but was not statistically better than either rate of Intruder, the low rate of Centric or the high rates of Orthene or Trimax Pro. Both rates of Centric and Intruder were the only insecticide treatments that 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F50 yielded significantly more than the untreated. At Test Site 3, the thrips population was averaged approximately 16.75 thrips per leaf on 26 Aug prior to the insecticide applications, and there were no statistical differences among treatments at this time (Table 3). At 7 DAT, Vydate at 17.0 fl-oz had fewer immature and total thrips than the untreated but did not differ from Vydate at 8.5 fl-oz. By 14 DAT, the thrips population had increased in the untreated check, and both rates of Vydate had fewer immature and total thrips than the untreated. Vydate does have some activity on these thrips, but the level of activity does not appear to be as good as what was observed from some of the other insecticides in the other tests. No differences in yield were detected among treatments in Test 3. 2 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F50 Test 1. Thrips per 5 leaves 25 Jul (pre-treatment) 28 Jul (3 DAT) 1 Aug (7 DAT) 9 Aug (15 DAT) Treatment/f Rate amt ormulation product/acre immatures adults total immatures adults total immatures adults total immatures adults total Untreated -- 377.75a 167.50a 545.25a 293.75a 51.25a 345.00a 334.00a 61.25a 395.25a 139.00a 56.00a 195.00a Trimax Pro 4.44SC 1.8 fl-oz 665.00a 110.50a 775.50a 90.00a 5.25a 95.25a 55.50cd 5.75a 61.25bc 21.25b 22.00b 43.25b Orthene 97S 8.0 oz 424.50a 61.00a 485.50a 145.25a 13.00a 158.25a 45.50cd 9.00a 54.50c 10.75b 13.75b 24.50b Intruder 70WP 1.0 oz 716.00a 136.50a 852.50a 77.75a 10.50a 88.25a 23.00d 1.75a 24.75c 0.50b 1.75b 2.25b Radiant 1SC 6.0 fl-oz 545.00a 113.75a 658.75a 154.75a 14.50a 169.25a 177.50bc 14.50a 192.00bc 2.25b 4.00b 6.25b Tracer 4SC 2.5 fl-oz 509.25a 242.25a 751.50a 227.25a 17.75a 245.00a 230.00ab 18.75a 248.75ab 15.50b 18.50b 34.00b Values in a column followed by the same letter are not significantly different (F-protected LSD:P ≤ 0.05). Test 2. Thrips per 10 leaves 7 Nov 17 Aug (pre-treatment) 24 Aug (7 DAT) 30 Aug (12 DAT) 8 Sep (21 DAT) Yield Treatment/ Rate amt formulation product/acre imm adults total imm adults total imm adults total imm adults total lint-lbs/ac Untreated -- 172.00a 51.25a 223.25a 217.00a 57.75a 274.75a 227.00a 52.25a 279.00a 53.00a 30.00a 83.00a 431.35d Trimax Pro 4.44SC 1.2 fl-oz 154.88a 225.71a 380.60a 42.25b 10.00b 52.25b 13.00b 15.75b 29.00b 2.00b 2.25b 4.25b 454.27cd Trimax Pro 4.44SC 1.8 fl-oz 158.25a 29.75a 188.00a 22.75b 6.75b 29.50b 1.00b 3.00b 4.00b 0.50b 2.50b 3.00b 675.92a-d Orthene 97S 4.0 oz 54.25a 38.25a 92.50a 13.50b 6.50b 20.00b 0.75b 3.50b 4.00b 1.00b 0.50b 1.50b 570.42bcd Orthene 97S 8.0 oz 168.88a 51.05a 219.93a 13.00b 13.00b 26.00b 4.75b 15.50b 20.00b 1.00b 2.25b 3.25b 727.05ab Intruder 70WP 0.6 oz 204.50a 57.25a 261.75a 13.00b 12.50b 25.50b 0.00b 0.50b 1.00b 0.75b 0.75b 1.50b 712.88ab Intruder 70WP 1.0 oz 154.50a 41.75a 196.25a 15.75b 14.75b 30.50b 0.75b 7.00b 8.00b 1.25b 0.25b 1.50b 766.93ab Centric 40WG 1.8 oz 171.00a 41.75a 212.75a 30.50b 24.00b 54.50b 0.75b 6.50b 7.00b 1.00b 3.25b 4.25b 859.01a Centric 40WG 2.5 oz 175.00a 66.00a 241.00a 12.50b 10.00b 22.50b 0.75b 4.25b 5.00b 1.00b 0.25b 1.25b 687.62abc Values in a column followed by the same letter are not significantly different (F-protected LSD; P ≤ 0.05). Test 3. Thrips per 10 leaves 10 Oct 26 Aug (pre-treatment) 1 Sep (7 DAT) 8 Sep (14 DAT) Yield Treatment/ Rate amt formulation product/acre imm adults total imm adults total imm adults total lint-lbs/ac Untreated -- 290.50a 381.25a 381.25a 295.00a 102.00a 397.00a 409.00a 173.50a 582.50a 639.25a Vydate C-LV 2.44S 8.5 fl-oz 214.50a 293.50a 293.50a 159.25ab 27.25a 186.50ab 141.50b 23.75a 165.25b 713.76a Vydate C-LV 2.44S 17 fl-oz 194.25a 314.25a 314.25a 48.25a 11.25a 59.50b 63.75b 20.50a 84.25b 688.09a Values in a column followed by the same letter are not significantly different (- F-protected LSD; P ≤ 0.05). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF INSECTICIDES FOR CONTROL OF KURTOMATHRIPS MORRILLI IN COTTON, 2011

Download PDF
3 pages

Loading next page...
 
/lp/oxford-university-press/evaluation-of-insecticides-for-control-of-kurtomathrips-morrilli-in-TZe7s0Drs0

References (0)

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.4182/amt.2012.F50
Publisher site
See Article on Publisher Site

Abstract

Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F50 (F50) COTTON: Gossypium hirsutum L., ‘Phytogen 367WRF’ 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 M. G. Anderson Texas AgriLife Extension Service Gaines County Seminole, TX 79360 Phone: (432) 758-8193 Fax: (432) 758-4031 Email: mganderson@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. A. Baugh Texas AgriLife Extension Service Lubbock County Lubbock, TX 79408 Phone: (806) 775-1680 Fax: (806) 435-1658 Email: bbaugh@ag.tamu.edu B. J. Kesey Texas AgriLife Extension Service Email: rjkesey@ag.tamu.edu Thrips: Kurtomathrips morrilli Moulton Three tests were conducted in a commercial cotton fields grown near Seminole, TX. The fields were on 36 or 40-inch rows, and were irrigated using a pivot irrigation system. All three tests were planted with the same variety, Phytogen 367WRF. All the tests were RCBD 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. Insecticides were applied to all four rows of each plot. Treatments were evaluated by collecting 5 or 10 leaves into 1-pt jars containing a 30% isopropyl alcohol solution. The jars were returned to the laboratory where the thrips were vacuum filtered onto filter paper and then counted using a stereo dissecting scope. On two tests, the middle two rows of each plot were harvested using a mechanized cotton stripper with integrated scales. Grab samples were ginned for turn out and quality. Data were analyzed using ANOVA and means were separated using an F-protected LSD (P ≤ 0.05). At Test Site 1, the thrips population was very high averaging, 136 thrips per leaf prior to spraying on 25 Jul (Table 1). At 3 days after treatment (DAT), the thrips numbers were highly variable among treatments and plots and there were no significant differences between treatments. However, for immature and total thrips at 7 DAT, Intruder at the fewest thrips, but did not differ from Orthene or Trimax Pro. Neither Radiant nor Tracer differed from the untreated. By 15 Aug the thrips population had declined across the entire test and all the insecticide treatments had fewer thrips than the untreated. At Test Site 2, the thrips population was averaged approximately 23 thrips per leaf when the test was initiated on 17 Aug (Table 2). At 7, 12, and 21 DAT, all of the products and rates evaluated had fewer thrips than the untreated, but there were no differences among the insecticides. Significant differences in yield were detected in this test. Centric at 1.8 oz had the highest yield but was not statistically better than either rate of Intruder, the low rate of Centric or the high rates of Orthene or Trimax Pro. Both rates of Centric and Intruder were the only insecticide treatments that 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F50 yielded significantly more than the untreated. At Test Site 3, the thrips population was averaged approximately 16.75 thrips per leaf on 26 Aug prior to the insecticide applications, and there were no statistical differences among treatments at this time (Table 3). At 7 DAT, Vydate at 17.0 fl-oz had fewer immature and total thrips than the untreated but did not differ from Vydate at 8.5 fl-oz. By 14 DAT, the thrips population had increased in the untreated check, and both rates of Vydate had fewer immature and total thrips than the untreated. Vydate does have some activity on these thrips, but the level of activity does not appear to be as good as what was observed from some of the other insecticides in the other tests. No differences in yield were detected among treatments in Test 3. 2 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.F50 Test 1. Thrips per 5 leaves 25 Jul (pre-treatment) 28 Jul (3 DAT) 1 Aug (7 DAT) 9 Aug (15 DAT) Treatment/f Rate amt ormulation product/acre immatures adults total immatures adults total immatures adults total immatures adults total Untreated -- 377.75a 167.50a 545.25a 293.75a 51.25a 345.00a 334.00a 61.25a 395.25a 139.00a 56.00a 195.00a Trimax Pro 4.44SC 1.8 fl-oz 665.00a 110.50a 775.50a 90.00a 5.25a 95.25a 55.50cd 5.75a 61.25bc 21.25b 22.00b 43.25b Orthene 97S 8.0 oz 424.50a 61.00a 485.50a 145.25a 13.00a 158.25a 45.50cd 9.00a 54.50c 10.75b 13.75b 24.50b Intruder 70WP 1.0 oz 716.00a 136.50a 852.50a 77.75a 10.50a 88.25a 23.00d 1.75a 24.75c 0.50b 1.75b 2.25b Radiant 1SC 6.0 fl-oz 545.00a 113.75a 658.75a 154.75a 14.50a 169.25a 177.50bc 14.50a 192.00bc 2.25b 4.00b 6.25b Tracer 4SC 2.5 fl-oz 509.25a 242.25a 751.50a 227.25a 17.75a 245.00a 230.00ab 18.75a 248.75ab 15.50b 18.50b 34.00b Values in a column followed by the same letter are not significantly different (F-protected LSD:P ≤ 0.05). Test 2. Thrips per 10 leaves 7 Nov 17 Aug (pre-treatment) 24 Aug (7 DAT) 30 Aug (12 DAT) 8 Sep (21 DAT) Yield Treatment/ Rate amt formulation product/acre imm adults total imm adults total imm adults total imm adults total lint-lbs/ac Untreated -- 172.00a 51.25a 223.25a 217.00a 57.75a 274.75a 227.00a 52.25a 279.00a 53.00a 30.00a 83.00a 431.35d Trimax Pro 4.44SC 1.2 fl-oz 154.88a 225.71a 380.60a 42.25b 10.00b 52.25b 13.00b 15.75b 29.00b 2.00b 2.25b 4.25b 454.27cd Trimax Pro 4.44SC 1.8 fl-oz 158.25a 29.75a 188.00a 22.75b 6.75b 29.50b 1.00b 3.00b 4.00b 0.50b 2.50b 3.00b 675.92a-d Orthene 97S 4.0 oz 54.25a 38.25a 92.50a 13.50b 6.50b 20.00b 0.75b 3.50b 4.00b 1.00b 0.50b 1.50b 570.42bcd Orthene 97S 8.0 oz 168.88a 51.05a 219.93a 13.00b 13.00b 26.00b 4.75b 15.50b 20.00b 1.00b 2.25b 3.25b 727.05ab Intruder 70WP 0.6 oz 204.50a 57.25a 261.75a 13.00b 12.50b 25.50b 0.00b 0.50b 1.00b 0.75b 0.75b 1.50b 712.88ab Intruder 70WP 1.0 oz 154.50a 41.75a 196.25a 15.75b 14.75b 30.50b 0.75b 7.00b 8.00b 1.25b 0.25b 1.50b 766.93ab Centric 40WG 1.8 oz 171.00a 41.75a 212.75a 30.50b 24.00b 54.50b 0.75b 6.50b 7.00b 1.00b 3.25b 4.25b 859.01a Centric 40WG 2.5 oz 175.00a 66.00a 241.00a 12.50b 10.00b 22.50b 0.75b 4.25b 5.00b 1.00b 0.25b 1.25b 687.62abc Values in a column followed by the same letter are not significantly different (F-protected LSD; P ≤ 0.05). Test 3. Thrips per 10 leaves 10 Oct 26 Aug (pre-treatment) 1 Sep (7 DAT) 8 Sep (14 DAT) Yield Treatment/ Rate amt formulation product/acre imm adults total imm adults total imm adults total lint-lbs/ac Untreated -- 290.50a 381.25a 381.25a 295.00a 102.00a 397.00a 409.00a 173.50a 582.50a 639.25a Vydate C-LV 2.44S 8.5 fl-oz 214.50a 293.50a 293.50a 159.25ab 27.25a 186.50ab 141.50b 23.75a 165.25b 713.76a Vydate C-LV 2.44S 17 fl-oz 194.25a 314.25a 314.25a 48.25a 11.25a 59.50b 63.75b 20.50a 84.25b 688.09a Values in a column followed by the same letter are not significantly different (- F-protected LSD; P ≤ 0.05).

Journal

Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2012

There are no references for this article.