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Yellow Aphid Control, 2014 *

Yellow Aphid Control, 2014 * Arthropod Management Tests, 2016, 1–1 doi: 10.1093/amt/tsv036 Section D: Citrus, Nuts, and Other Tree Fruits PECAN: Carya illinoinensis (Wangenheim) K. Koch Mark A. Muegge Texas Agrilife Extension Center, Texas A&M University, P.O. Box 1298, Fort Stockton, TX 79735 ( Deceased) Subject Editor: Elizabeth Grafton-Cardwell Pecan nut | Carya illinoensis blackmargined aphid | Monellia caryella yellow pecan aphid | Monelliopsis pecanis Efficacy of several insecticides was evaluated for BMA and YPA con- Prior to treatment application, significant differences of YA pop- trol. The two species of yellow aphids (YAs) are difficult to separate in ulation densities were not found among treated and check trees. the field; therefore, both species were pooled and collectively referred None of the insecticide treatments relative to the untreated check to as YAs. This study was conducted in a commercial pecan orchard significantly reduced alate YAs at 4 or 8 DAT (Table 1). Closer and in Pecos County, TX. A single pecan tree constituted an experimental the two rates of Beleaf significantly reduced apterous YA population unit. Experimental units were arranged in an RCBD with seven treat- densities relative to the untreated check at 4 and 8 DAT. Apta- ments replicated four times. Insecticide applications were made using treated trees possessed significantly lower apterous YA population a high-pressure gasoline powered sprayer calibrated to deliver 100 gpa densities only at 8 DAT. Although numerically lower, the Admire at 100 psi. From each experimental unit, three randomly selected com- Pro treatment did not significantly reduce apterous YA population pound leaves were examined for YAs. Alate and apterous YAs were densities. Sulfur had no effect on alate or apterous YA population counted separately and recorded. Treatments were applied on 29 densities relative to the untreated check trees. Overall, Closer and October after pretreatment samples had been collected. Posttreatment Beleaf appeared to provide superior YA control relative to the other samples were taken at 4 and 8 DAT. Mean number of alate and apter- treatments in this study. Phytotoxicity was not observed during the ous aphids were subjected to ANOVA. Treatment mean separation course of this study. was performed using Fisher’s protected LSD (P¼ 0.05). Table 1 Mean alate YA/3 compound leaves Mean apterous YA/3 compound leaves Treatment/ Rate form/acre 0 DAT 4 DAT 8 DAT 0 DAT 4 DAT 8 DAT formulation or % vol/vol Untreated check — 5.5a 3.8 2.1abc 69.2a 46.3ab 25.1ab Admire Pro 2 oz 8.6a 3.5 2.0abc 100.3a 7.5bc 7.1bc Aptaþ NIS 17 ozþ 0.25% 12.3a 2.6 2.3ab 108.5a 19.6abc 6.3c Closer 2.1 oz 7.0a 1.2 0.7c 68.7a 3.4c 0.1c Beleaf 2.2 oz 6.7a 2.2 0.9bc 69.7a 1.2c 0.2c Beleaf 2.8 oz 5.6a 1.2 0.6c 73.6a 0.5c 0.3c Sulfur 16 oz 4.7a 2.4 2.5a 71.4a 50.7a 37.2a Means within columns followed by the same letter are not significantly different (Fisher’s protected LSD, P> 0.05). * This research was supported by industry gifts of pesticides and funds. V C The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Yellow Aphid Control, 2014 *

Muegge, Mark A.
Arthropod Management Tests , Volume 41 (1) – Jul 1, 2016
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Oxford University Press
Copyright
© The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America.
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2155-9856
DOI
10.1093/amt/tsv036
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Abstract

Arthropod Management Tests, 2016, 1–1 doi: 10.1093/amt/tsv036 Section D: Citrus, Nuts, and Other Tree Fruits PECAN: Carya illinoinensis (Wangenheim) K. Koch Mark A. Muegge Texas Agrilife Extension Center, Texas A&M University, P.O. Box 1298, Fort Stockton, TX 79735 ( Deceased) Subject Editor: Elizabeth Grafton-Cardwell Pecan nut | Carya illinoensis blackmargined aphid | Monellia caryella yellow pecan aphid | Monelliopsis pecanis Efficacy of several insecticides was evaluated for BMA and YPA con- Prior to treatment application, significant differences of YA pop- trol. The two species of yellow aphids (YAs) are difficult to separate in ulation densities were not found among treated and check trees. the field; therefore, both species were pooled and collectively referred None of the insecticide treatments relative to the untreated check to as YAs. This study was conducted in a commercial pecan orchard significantly reduced alate YAs at 4 or 8 DAT (Table 1). Closer and in Pecos County, TX. A single pecan tree constituted an experimental the two rates of Beleaf significantly reduced apterous YA population unit. Experimental units were arranged in an RCBD with seven treat- densities relative to the untreated check at 4 and 8 DAT. Apta- ments replicated four times. Insecticide applications were made using treated trees possessed significantly lower apterous YA population a high-pressure gasoline powered sprayer calibrated to deliver 100 gpa densities only at 8 DAT. Although numerically lower, the Admire at 100 psi. From each experimental unit, three randomly selected com- Pro treatment did not significantly reduce apterous YA population pound leaves were examined for YAs. Alate and apterous YAs were densities. Sulfur had no effect on alate or apterous YA population counted separately and recorded. Treatments were applied on 29 densities relative to the untreated check trees. Overall, Closer and October after pretreatment samples had been collected. Posttreatment Beleaf appeared to provide superior YA control relative to the other samples were taken at 4 and 8 DAT. Mean number of alate and apter- treatments in this study. Phytotoxicity was not observed during the ous aphids were subjected to ANOVA. Treatment mean separation course of this study. was performed using Fisher’s protected LSD (P¼ 0.05). Table 1 Mean alate YA/3 compound leaves Mean apterous YA/3 compound leaves Treatment/ Rate form/acre 0 DAT 4 DAT 8 DAT 0 DAT 4 DAT 8 DAT formulation or % vol/vol Untreated check — 5.5a 3.8 2.1abc 69.2a 46.3ab 25.1ab Admire Pro 2 oz 8.6a 3.5 2.0abc 100.3a 7.5bc 7.1bc Aptaþ NIS 17 ozþ 0.25% 12.3a 2.6 2.3ab 108.5a 19.6abc 6.3c Closer 2.1 oz 7.0a 1.2 0.7c 68.7a 3.4c 0.1c Beleaf 2.2 oz 6.7a 2.2 0.9bc 69.7a 1.2c 0.2c Beleaf 2.8 oz 5.6a 1.2 0.6c 73.6a 0.5c 0.3c Sulfur 16 oz 4.7a 2.4 2.5a 71.4a 50.7a 37.2a Means within columns followed by the same letter are not significantly different (Fisher’s protected LSD, P> 0.05). * This research was supported by industry gifts of pesticides and funds. V C The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Arthropod Management Tests – Oxford University Press

Published: Jul 1, 2016

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