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Abamectin Grower Cooperator Citrus Thrips Trials, 1994

Abamectin Grower Cooperator Citrus Thrips Trials, 1994 Downloaded from https://academic.oup.com/amt/article-abstract/22/1/73/4639864 by DeepDyve user on 21 July 2020 Arthropod Management Tests, Vol. 22 73 D: CITRUS, NUTS, AND AVOCADOS Orange: Citrus sinensis: (L.) Osbeck Inamullah Khan & J. G. Morse (16D) Citrus thrips: Scirtothrips citri (Moulton) Department of Entomology University of California Riverside, CA 92521 (909)787-581 4 ABAMECTIN GROWER COOPERATOR CITRUS THRIPS TRIALS, 1994: Abamectin was compared with a standard pesticide (Baythroid, Carzol, or Veratran D) at ten sites in the San Joaquin Valley during spring, 1994. Treatments were applied to navel oranges except at the Cameo site where Valencia' oranges were treated. Treatments were replicated once or twice at each site and each replicate plot was at least 6 rows wide (most were larger, 2 acres or more). Citrus thrips fruit scarring was evaluated from Oct 1994—Feb 1995. For this, all fruit from eye to knee level on the exterior of 30 ran­ domly selected trees from the interior of each plot were examined except at Carter where 20 trees per treatment were evaluated. Scarring was rated as: (a) none, (b) slight (any citrus thrips scarring), (c) severe (complete ring scar or extensive surface scarring at a level that would cause downgrading of fruit in ;i commercial operation). In a normal year, approximately 5% severe scars are regarded as the economic scarring levels. In 1994, late April and May were relatively cool and wet. Petal fall in District 1 of Tulare County was declared on 24 April. Based on weather data from the Lindcove Field Station near Exeter, precipitation occurred on 23 April (0.2 inch), 24 Apr (0.24), 25 Apr (0.12), 26 Apr (0.43), 27 Apr (0.08), 6 May (0.24), 7 May (0.08), 17 May (0.35), 18 May (0.08), and 30 May (0.12). At Lindcove, the mean average temperature the week of petal fall was 57.7° F and for the four weeks after petal fall it was 63.4°F. Citrus thrips pop­ ulation pressure in these fields in 1994 was quite low. Out of the 10 sites, statistical separation between treatments was observed at only four sites. At two sites, Agri-Mek performed better than one (S & J Ranch) or two (Gram) applications of Veteran D. At two sites, Agri-Mek was less effective than stan­ dards (Richardson-Carzol, Trust-Baythroid). % outside fruit scarred by citrus thrips Grove No. of fruit Cooperator(s ) Location Replicates Treatment Rate/acre Timing Gpa examined Slight Severe Total Stutsman Exeter Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.8% 12-May 125 1,613 6.7a 0.3a 7.0a lim Stewart Baythroid 2EC + 10-12-0 6.4 fl oz + 0.25 gal 12-May 125 1,345 8.6a 0.7a 9.3a Yokohl Lindcove Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.8% 13-May 125 1,716 8.7a 0.3a 9.0a lim Stewart Veratran D 0.2% + Molasses 12.5 lbs + 1 gal 13-May 125 1,720 5.1a 0.9a 5.9a Henghst lOflo z + 1.0% 7-May 50 1,150 7.2a 0.4a 7.6a Woodlake Agri-Mek 0.15 EC + NR 415 Oil (im Stewart Veratran D 0.2% + Molasses 12.5 lbs + 1 gal 7-May 50 1,184 6.8a 0.4a 7.2a Rayo 24 2 10 fl oz + 0.25% 10-May 100 4,749 10.1a 1.0a 11.1a Woodlake Agri-Mek 0.15 EC + NR 415 Oil lim Gorden 2 Veratran D 0.2% + Molasses 12.5 lbs + 1 gal 10-May 100 4,531 14.0a 2.5a 16.5a Lorsban 4E (whole field) 12 pints/acre 26-May 750 Gran Ranch Porterville 2 Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.8% 9-May 125 4,327 8.1a 1.0b 9.1a Mike Spry 2 14 lb + 2 gal 9-May 75 4,202 10.6a 2.9a 13.5a Veratran D 0.2% + Molasses Repeat treatment of Veratran D was applied to the whole field on 21-May. Richardson Porterville 1 Carzol + Zn 7% + Urea 5 lbs + 3 gal 30-Apr 125 1,417 7.5a 0.1b 7.5a + 100 lbs 3,650 John Richardson 2 Agri-Mek 0.15 EC + NR415 Oil 40flo z + 1.6% + 30-Apr 125 7.8a 0.4a 8.2a + Urea + Zn 7% + Mn 6% 1 lb + 3 gal + 3 gal Trust 83-10 Porterville 1 Baythroid 2EC + Buffer plus 6.4 fl oz + 0.25 gal 11-May 125 1,564 36.6a 3.2b 39.8a lim Stewart 1 Carzol 92SP + Buffer plus 1.25 lbs + 0.25 gal 11-May 125 1,642 32.2b 6.8a 39.0a 1 Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.8% 11-May 125 1,839 27.2c 7.3a 34.5a Carter 1-2 Porterville 2 Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.25% 4-May 100 490 3.9a 0.2a 4.1a lim Gorden 2 Veratran D 0.2% + Molasses 12.50 lbs + 1 gal 4-May 100 556 4.65a 0a 4.65a Cameo Richgrove 2 Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.5% 4—5-May 50 3,659 9.7a 1.2a 10.8a + Lorsban 4E + 3floz Blocks Veratran D 0.2% + Molasses 12.5 lbs + 1.5 gal 19-20-May 202 & 206 2 Veratran D 0.2% + Molasses 12.5 lbs + 1.5 gal 4-5-Ma y 50 2,353 7.8a 2.2a 10.0a + Lorsban 4E + 3floz Rick Dunn Veratran D 0.2% + Molasses 12.5 lbs + 1.5 gal 19-20-May S&J Ranch Madera 2 Agri-Mek 0.15 EC + Uni-par Oil lOflo z + 1.0% 14-May 100 2,311 4.8b 0.8b 5.6b Block 6-9 2 Veratran D 0.2% + Molasses 12 lbs + 1.5 gal 14-May 100 2,234 12.7a 4.0a 16.7a Andrea Gjerde/Kevin Olsen Means within a column followed by the same letter are not significantly different (P 0.05, REGWQ multiple range test in SAS Version 5) after orcsine square-root transformation. Untransformed means are listed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Abamectin Grower Cooperator Citrus Thrips Trials, 1994

Arthropod Management Tests , Volume 22 (1) – Jan 1, 1997

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Oxford University Press
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© 1997 Entomological Society of America.
eISSN
2155-9856
DOI
10.1093/amt/22.1.73
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/73/4639864 by DeepDyve user on 21 July 2020 Arthropod Management Tests, Vol. 22 73 D: CITRUS, NUTS, AND AVOCADOS Orange: Citrus sinensis: (L.) Osbeck Inamullah Khan & J. G. Morse (16D) Citrus thrips: Scirtothrips citri (Moulton) Department of Entomology University of California Riverside, CA 92521 (909)787-581 4 ABAMECTIN GROWER COOPERATOR CITRUS THRIPS TRIALS, 1994: Abamectin was compared with a standard pesticide (Baythroid, Carzol, or Veratran D) at ten sites in the San Joaquin Valley during spring, 1994. Treatments were applied to navel oranges except at the Cameo site where Valencia' oranges were treated. Treatments were replicated once or twice at each site and each replicate plot was at least 6 rows wide (most were larger, 2 acres or more). Citrus thrips fruit scarring was evaluated from Oct 1994—Feb 1995. For this, all fruit from eye to knee level on the exterior of 30 ran­ domly selected trees from the interior of each plot were examined except at Carter where 20 trees per treatment were evaluated. Scarring was rated as: (a) none, (b) slight (any citrus thrips scarring), (c) severe (complete ring scar or extensive surface scarring at a level that would cause downgrading of fruit in ;i commercial operation). In a normal year, approximately 5% severe scars are regarded as the economic scarring levels. In 1994, late April and May were relatively cool and wet. Petal fall in District 1 of Tulare County was declared on 24 April. Based on weather data from the Lindcove Field Station near Exeter, precipitation occurred on 23 April (0.2 inch), 24 Apr (0.24), 25 Apr (0.12), 26 Apr (0.43), 27 Apr (0.08), 6 May (0.24), 7 May (0.08), 17 May (0.35), 18 May (0.08), and 30 May (0.12). At Lindcove, the mean average temperature the week of petal fall was 57.7° F and for the four weeks after petal fall it was 63.4°F. Citrus thrips pop­ ulation pressure in these fields in 1994 was quite low. Out of the 10 sites, statistical separation between treatments was observed at only four sites. At two sites, Agri-Mek performed better than one (S & J Ranch) or two (Gram) applications of Veteran D. At two sites, Agri-Mek was less effective than stan­ dards (Richardson-Carzol, Trust-Baythroid). % outside fruit scarred by citrus thrips Grove No. of fruit Cooperator(s ) Location Replicates Treatment Rate/acre Timing Gpa examined Slight Severe Total Stutsman Exeter Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.8% 12-May 125 1,613 6.7a 0.3a 7.0a lim Stewart Baythroid 2EC + 10-12-0 6.4 fl oz + 0.25 gal 12-May 125 1,345 8.6a 0.7a 9.3a Yokohl Lindcove Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.8% 13-May 125 1,716 8.7a 0.3a 9.0a lim Stewart Veratran D 0.2% + Molasses 12.5 lbs + 1 gal 13-May 125 1,720 5.1a 0.9a 5.9a Henghst lOflo z + 1.0% 7-May 50 1,150 7.2a 0.4a 7.6a Woodlake Agri-Mek 0.15 EC + NR 415 Oil (im Stewart Veratran D 0.2% + Molasses 12.5 lbs + 1 gal 7-May 50 1,184 6.8a 0.4a 7.2a Rayo 24 2 10 fl oz + 0.25% 10-May 100 4,749 10.1a 1.0a 11.1a Woodlake Agri-Mek 0.15 EC + NR 415 Oil lim Gorden 2 Veratran D 0.2% + Molasses 12.5 lbs + 1 gal 10-May 100 4,531 14.0a 2.5a 16.5a Lorsban 4E (whole field) 12 pints/acre 26-May 750 Gran Ranch Porterville 2 Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.8% 9-May 125 4,327 8.1a 1.0b 9.1a Mike Spry 2 14 lb + 2 gal 9-May 75 4,202 10.6a 2.9a 13.5a Veratran D 0.2% + Molasses Repeat treatment of Veratran D was applied to the whole field on 21-May. Richardson Porterville 1 Carzol + Zn 7% + Urea 5 lbs + 3 gal 30-Apr 125 1,417 7.5a 0.1b 7.5a + 100 lbs 3,650 John Richardson 2 Agri-Mek 0.15 EC + NR415 Oil 40flo z + 1.6% + 30-Apr 125 7.8a 0.4a 8.2a + Urea + Zn 7% + Mn 6% 1 lb + 3 gal + 3 gal Trust 83-10 Porterville 1 Baythroid 2EC + Buffer plus 6.4 fl oz + 0.25 gal 11-May 125 1,564 36.6a 3.2b 39.8a lim Stewart 1 Carzol 92SP + Buffer plus 1.25 lbs + 0.25 gal 11-May 125 1,642 32.2b 6.8a 39.0a 1 Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.8% 11-May 125 1,839 27.2c 7.3a 34.5a Carter 1-2 Porterville 2 Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.25% 4-May 100 490 3.9a 0.2a 4.1a lim Gorden 2 Veratran D 0.2% + Molasses 12.50 lbs + 1 gal 4-May 100 556 4.65a 0a 4.65a Cameo Richgrove 2 Agri-Mek 0.15 EC + NR 415 Oil 10 fl oz + 0.5% 4—5-May 50 3,659 9.7a 1.2a 10.8a + Lorsban 4E + 3floz Blocks Veratran D 0.2% + Molasses 12.5 lbs + 1.5 gal 19-20-May 202 & 206 2 Veratran D 0.2% + Molasses 12.5 lbs + 1.5 gal 4-5-Ma y 50 2,353 7.8a 2.2a 10.0a + Lorsban 4E + 3floz Rick Dunn Veratran D 0.2% + Molasses 12.5 lbs + 1.5 gal 19-20-May S&J Ranch Madera 2 Agri-Mek 0.15 EC + Uni-par Oil lOflo z + 1.0% 14-May 100 2,311 4.8b 0.8b 5.6b Block 6-9 2 Veratran D 0.2% + Molasses 12 lbs + 1.5 gal 14-May 100 2,234 12.7a 4.0a 16.7a Andrea Gjerde/Kevin Olsen Means within a column followed by the same letter are not significantly different (P 0.05, REGWQ multiple range test in SAS Version 5) after orcsine square-root transformation. Untransformed means are listed.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1997

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