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EFFICACY OF ZEAL MITICIDE AGAINST BANKS GRASS MITE INFESTING TASSEL STAGE CORN - 2009

EFFICACY OF ZEAL MITICIDE AGAINST BANKS GRASS MITE INFESTING TASSEL STAGE CORN - 2009 Arthropod Management Tests 2011, Vol. 36 doi: 10.4182/amt.2011.F27 F27 CORN: Zea mays L. M. Vandiver Texas AgriLife Extension Service 118 W. Avenue C Muleshoe, TX 79347 Phone: (806) 272-4584 Fax: (806) 272-4583- E-mail: mvandiver@ag.tamu.edu E. D. Bynum E-mail: ebynum@ag.tamu.edu E. Nino E-mail: enino@dow.com Banks grass mite: Oligonychus pratensis (Banks) The experiment was arranged in a RCB with 3 replications. Plots were 4 rows wide (30 inch centers) by 45 ft long. Miticides were applied 23 Jul with a CO pressurized hand-carried backpack sprayer calibrated to deliver 19.1 gpa at 50 psi through TX-8 Hollow Cone nozzles (2 per row). Conditions were sunny with temperatures in the 80’s. Oberon and Hero + Dimate treatments were mixed with a crop oil concentrate at a rate of 32 fl oz. /acre. Pretreatment spider mite counts were taken 23 Jul before treatment (Pretrt) and post-treatment counts taken 30 Jul (7 DAT), 8 Aug (14 DAT), 14 Aug (22 DAT), and 20 Aug (28 DAT) days after treatment (DAT). th th Spider mites were sampled by collecting 5 leaves per plot. The leaf sampled was either the 4 or 5 leaf up the plant from the lowest bottom leaf with at least 1/3 of the leaf green. Mobile mites on a leaf were counted with the aid of an Optivisor binocular magnifier, model DA10. Data were analyzed using analysis of variance (ANOVA) and when a significant F test was observed, mean separation was performed using the least significant difference (LSD) at the 10% probability level. All treatments had similar numbers of mites/leaf pretreatment (Table 1). There were also no differences observed between treatments at 7 DAT and 14 DAT. The Hero/Dimate treatment seemed to flare the mites by 22 DAT pushing populations significantly higher than the untreated check. Zeal performed as well or better than other commercially available miticides and no rate response was observed between Zeal treatments Table 1. Number of BGM per leaf Treatment/ Formulation Rate amt / acre Pre-trt 7 DAT 14 DAT 22 DAT 28 DAT Zeal 72WG 1.0 oz 13a 8a 10a 9c 4b Zeal 72WG 1.5 oz 33a 10a 5a 18bc 4b Zeal 72WG 2.0 oz 22a 24a 8a 17c 2b Zeal 72WG 2.4 oz 19a 8a 9a 11c 5b Zeal 72WG 3.0 oz 36a 9a 9a 14c 1b Comite II 3.375 pt 12a 15a 24a 25bc 8b Oberon 4SC 4.25 fl oz 36a 12a 10a 69ab 16b Hero + Dimate 4E 10.2 fl oz + 16 fl oz 25a 14a 32a 107a 105a Untreated Check 27a 11a 19a 43bc 9b LSD 32 15 22 50 15 Means in a column followed by the same letter are not significantly different (LSD, P≤ 0.10). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFICACY OF ZEAL MITICIDE AGAINST BANKS GRASS MITE INFESTING TASSEL STAGE CORN - 2009

Arthropod Management Tests , Volume 36 (1) – Jan 1, 2011

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10.4182/amt.2011.F27
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Abstract

Arthropod Management Tests 2011, Vol. 36 doi: 10.4182/amt.2011.F27 F27 CORN: Zea mays L. M. Vandiver Texas AgriLife Extension Service 118 W. Avenue C Muleshoe, TX 79347 Phone: (806) 272-4584 Fax: (806) 272-4583- E-mail: mvandiver@ag.tamu.edu E. D. Bynum E-mail: ebynum@ag.tamu.edu E. Nino E-mail: enino@dow.com Banks grass mite: Oligonychus pratensis (Banks) The experiment was arranged in a RCB with 3 replications. Plots were 4 rows wide (30 inch centers) by 45 ft long. Miticides were applied 23 Jul with a CO pressurized hand-carried backpack sprayer calibrated to deliver 19.1 gpa at 50 psi through TX-8 Hollow Cone nozzles (2 per row). Conditions were sunny with temperatures in the 80’s. Oberon and Hero + Dimate treatments were mixed with a crop oil concentrate at a rate of 32 fl oz. /acre. Pretreatment spider mite counts were taken 23 Jul before treatment (Pretrt) and post-treatment counts taken 30 Jul (7 DAT), 8 Aug (14 DAT), 14 Aug (22 DAT), and 20 Aug (28 DAT) days after treatment (DAT). th th Spider mites were sampled by collecting 5 leaves per plot. The leaf sampled was either the 4 or 5 leaf up the plant from the lowest bottom leaf with at least 1/3 of the leaf green. Mobile mites on a leaf were counted with the aid of an Optivisor binocular magnifier, model DA10. Data were analyzed using analysis of variance (ANOVA) and when a significant F test was observed, mean separation was performed using the least significant difference (LSD) at the 10% probability level. All treatments had similar numbers of mites/leaf pretreatment (Table 1). There were also no differences observed between treatments at 7 DAT and 14 DAT. The Hero/Dimate treatment seemed to flare the mites by 22 DAT pushing populations significantly higher than the untreated check. Zeal performed as well or better than other commercially available miticides and no rate response was observed between Zeal treatments Table 1. Number of BGM per leaf Treatment/ Formulation Rate amt / acre Pre-trt 7 DAT 14 DAT 22 DAT 28 DAT Zeal 72WG 1.0 oz 13a 8a 10a 9c 4b Zeal 72WG 1.5 oz 33a 10a 5a 18bc 4b Zeal 72WG 2.0 oz 22a 24a 8a 17c 2b Zeal 72WG 2.4 oz 19a 8a 9a 11c 5b Zeal 72WG 3.0 oz 36a 9a 9a 14c 1b Comite II 3.375 pt 12a 15a 24a 25bc 8b Oberon 4SC 4.25 fl oz 36a 12a 10a 69ab 16b Hero + Dimate 4E 10.2 fl oz + 16 fl oz 25a 14a 32a 107a 105a Untreated Check 27a 11a 19a 43bc 9b LSD 32 15 22 50 15 Means in a column followed by the same letter are not significantly different (LSD, P≤ 0.10).

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2011

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