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CONTROL OF TWOSPOTTED SPIDER MITE AND EUROPEAN RED MITE ON PEARS, 2002

CONTROL OF TWOSPOTTED SPIDER MITE AND EUROPEAN RED MITE ON PEARS, 2002 (A27) PEAR: Pyrus communis (L.), 'Bartlett' R. A. Van Steenwyk Department of E.S.P.M. 201 Wellman Hall University of California Berkeley, CA 94720-3112 Tel: (510) 643-5159 Fax: (510) 642-4879 bobvanst@nature.berkeley.edu R. M. Nomoto S. K. Zolbrod European red mite (ERM): Panonychus ulmi (Koch) Twospotted spider mite (TSSM): Tetranychus urticae (Koch) A trial was conducted on mature 'Bartlett' pear trees in a commercial orchard near Fairfield, CA. Four experimental insecticides and two untreated controls were replicated four times in a RCB design. Each replicate consisted of an individual tree with buffer trees in each direction. Treatments were applied between 8:00 and 10:00 AM on 21 Aug with a handgun orchard sprayer operating at 250 psi and delivering 250 gpa of finished spray (2.53 gal per tree). All of the trees, except for the untreated control (Season), were treated with 0.072 lb (AI)/acre of Asana on 1 May and 29 May and 0.0155 lb (AI)/acre of Asana on 26 Jun to flare mite populations. Control of motile TSSM and ERM was evaluated weekly from 15 Aug (pre- treatment sample) through 22 Sep by sampling 10 exterior and 10 interior leaves per replicate. The leaves were brushed and the motile mites were counted under magnification (20x ). Acramite, Pyramite and Mesa provided excellent control of TSSM but Mesa was less effective against ERM. Acramite and Pyramite caused a significant reduction in the TSSM population compared to the post-harvest untreated control (Table 1). All experimental miticides caused a significant reduction in the ERM population compared to the post-harvest untreated control (Table 2). However, there was no difference among the experimental miticides and the untreated control (season) for either mite species. Thus the repeated in- season applications of Asana resulted in a secondary flare-up of TSSM and ERM. There was a slight rate response with Acramite for ERM but not for TSSM. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF TWOSPOTTED SPIDER MITE AND EUROPEAN RED MITE ON PEARS, 2002

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/28.1.A27
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Abstract

(A27) PEAR: Pyrus communis (L.), 'Bartlett' R. A. Van Steenwyk Department of E.S.P.M. 201 Wellman Hall University of California Berkeley, CA 94720-3112 Tel: (510) 643-5159 Fax: (510) 642-4879 bobvanst@nature.berkeley.edu R. M. Nomoto S. K. Zolbrod European red mite (ERM): Panonychus ulmi (Koch) Twospotted spider mite (TSSM): Tetranychus urticae (Koch) A trial was conducted on mature 'Bartlett' pear trees in a commercial orchard near Fairfield, CA. Four experimental insecticides and two untreated controls were replicated four times in a RCB design. Each replicate consisted of an individual tree with buffer trees in each direction. Treatments were applied between 8:00 and 10:00 AM on 21 Aug with a handgun orchard sprayer operating at 250 psi and delivering 250 gpa of finished spray (2.53 gal per tree). All of the trees, except for the untreated control (Season), were treated with 0.072 lb (AI)/acre of Asana on 1 May and 29 May and 0.0155 lb (AI)/acre of Asana on 26 Jun to flare mite populations. Control of motile TSSM and ERM was evaluated weekly from 15 Aug (pre- treatment sample) through 22 Sep by sampling 10 exterior and 10 interior leaves per replicate. The leaves were brushed and the motile mites were counted under magnification (20x ). Acramite, Pyramite and Mesa provided excellent control of TSSM but Mesa was less effective against ERM. Acramite and Pyramite caused a significant reduction in the TSSM population compared to the post-harvest untreated control (Table 1). All experimental miticides caused a significant reduction in the ERM population compared to the post-harvest untreated control (Table 2). However, there was no difference among the experimental miticides and the untreated control (season) for either mite species. Thus the repeated in- season applications of Asana resulted in a secondary flare-up of TSSM and ERM. There was a slight rate response with Acramite for ERM but not for TSSM.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2003

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