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EVALUATION OF MITICIDES AGAINST THE TWO-SPOTTED SPIDER MITE, 2005

EVALUATION OF MITICIDES AGAINST THE TWO-SPOTTED SPIDER MITE, 2005 (C21) STRAWBERRY: Fragaria x ananassa Duchesne, ‘Camarosa’ Frank Zalom Department of Entomology University of California, Davis One Shields Ave Davis, CA 95616-8584 Phone: (530) 752-3687 Fax: (530) 752-1537 E-mail: fgzalom@ucdavis.edu Patricia Thompson Nikki Nicola Kirk Larson Department of Plant Sciences University of California, Davis 7601 Irvine Blvd Irvine, CA 92618 Phone: (949)-857-0136 Fax: (949) 653-1800 E-mail: kdlarson@ucdavis.edu Two-spotted spider mite (TSSM): Tetranychus urticae Koch This research was intended to compare one registered and several new candidate miticides for their effectiveness in controlling TSSM on California strawberries. Clone/runner bareroot plants were transplanted at the UC South Coast Research and Extension Center, Irvine, CA, Oct, 2004, onto 64-inch beds through clear polyethylene mulch. All treatments, including untreated check, consisted of three replicate plots of 20 plants each in a CRB design. All treatments were applied 29 Mar 2005, using an Echo Duster-Mister Air-Assist Sprayer at a volume of 200 gpa. Due to the wet winter conditions, the timing of the treatments in this year was later than in most years we have experienced. TSSM abundance was determined immediately before the 29 Mar treatments and weekly thereafter six times by leaf brushing 10 mid-tier leaflets per replicate onto a single glass plate, counting the mites, and determining density on a per-leaflet basis. Data were subjected to ANOVA and means were separated using Dunnett’s (P ≤ 0.05). TSSM densities averaged about 28 per midtier leaflet immediately before the first application of materials, somewhat exceeding the action threshold level of 15-20 motile mites. This initial high spider mite density is not ideal for control to be achieved by some materials. TSSM densities continued to increase in untreated checks following the application, and remained high for five wks before they finally started to decline. Treatment differences began to become evident in the second wk after applications with all treatments showing significant control compared to the untreated check. By the fifth wk after treatments, only the low level of Kanemite without adjuvant failed to provide significant control of TSSM. However, by wk six, only Oberon continued to provide significant control of TSSM versus the untreated check. Mean motile TSSM/leaflet Treatment/ Rate amt formulation product/acre 29 Mar 5 Apr 13 Apr 21 Apr 4 May 12 May 18 May Untreated check -- 55.3 35.8 84.8 122.2 76.2 70.8 36.6 Kanemite 15F 31 fl oz 30.2 15.1 10.5* 7.4* 6.1* 11.3 32.8 Kanemite 15F 21 fl oz 16.3 22.2 11.2* 22.3 35.8 42.0 40.2 Kanemite 15F + 21 fl oz + 16 fl oz 15.7 31.8 14.4* 14.4 14.8* 12.3 68.7 TopFilm SE Zeal 72WDG 3.0 oz 24.6 11.2 5.1* 2.8* 4.4* 8.6 28.2 Oberon 2SC 16 fl oz 12.8 8.0 7.2* 5.2* 0.8* 4.0* 12.0 Acramite 50WS 16 oz 60.7 16.0 17.9* 1.0* 0.9* 9.8 9.6 Fujimite 5EC 2.0 pt 10.3 8.1 3.4* 1.5 3.1* 15.5 27.8 Fujimite 5EC 1.0 pt 27.6 25.6 10.9* 2.2* 7.0* 36.4 31.4 *TSSM density is significantly different from untreated check based on Dunnett’s (P ≤ 0.05). Application rates are stated as formulated product per acre. n = 2 reps only for this treatment. No data collected previous wk due to heavy rains. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF MITICIDES AGAINST THE TWO-SPOTTED SPIDER MITE, 2005

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/31.1.C21
Publisher site
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Abstract

(C21) STRAWBERRY: Fragaria x ananassa Duchesne, ‘Camarosa’ Frank Zalom Department of Entomology University of California, Davis One Shields Ave Davis, CA 95616-8584 Phone: (530) 752-3687 Fax: (530) 752-1537 E-mail: fgzalom@ucdavis.edu Patricia Thompson Nikki Nicola Kirk Larson Department of Plant Sciences University of California, Davis 7601 Irvine Blvd Irvine, CA 92618 Phone: (949)-857-0136 Fax: (949) 653-1800 E-mail: kdlarson@ucdavis.edu Two-spotted spider mite (TSSM): Tetranychus urticae Koch This research was intended to compare one registered and several new candidate miticides for their effectiveness in controlling TSSM on California strawberries. Clone/runner bareroot plants were transplanted at the UC South Coast Research and Extension Center, Irvine, CA, Oct, 2004, onto 64-inch beds through clear polyethylene mulch. All treatments, including untreated check, consisted of three replicate plots of 20 plants each in a CRB design. All treatments were applied 29 Mar 2005, using an Echo Duster-Mister Air-Assist Sprayer at a volume of 200 gpa. Due to the wet winter conditions, the timing of the treatments in this year was later than in most years we have experienced. TSSM abundance was determined immediately before the 29 Mar treatments and weekly thereafter six times by leaf brushing 10 mid-tier leaflets per replicate onto a single glass plate, counting the mites, and determining density on a per-leaflet basis. Data were subjected to ANOVA and means were separated using Dunnett’s (P ≤ 0.05). TSSM densities averaged about 28 per midtier leaflet immediately before the first application of materials, somewhat exceeding the action threshold level of 15-20 motile mites. This initial high spider mite density is not ideal for control to be achieved by some materials. TSSM densities continued to increase in untreated checks following the application, and remained high for five wks before they finally started to decline. Treatment differences began to become evident in the second wk after applications with all treatments showing significant control compared to the untreated check. By the fifth wk after treatments, only the low level of Kanemite without adjuvant failed to provide significant control of TSSM. However, by wk six, only Oberon continued to provide significant control of TSSM versus the untreated check. Mean motile TSSM/leaflet Treatment/ Rate amt formulation product/acre 29 Mar 5 Apr 13 Apr 21 Apr 4 May 12 May 18 May Untreated check -- 55.3 35.8 84.8 122.2 76.2 70.8 36.6 Kanemite 15F 31 fl oz 30.2 15.1 10.5* 7.4* 6.1* 11.3 32.8 Kanemite 15F 21 fl oz 16.3 22.2 11.2* 22.3 35.8 42.0 40.2 Kanemite 15F + 21 fl oz + 16 fl oz 15.7 31.8 14.4* 14.4 14.8* 12.3 68.7 TopFilm SE Zeal 72WDG 3.0 oz 24.6 11.2 5.1* 2.8* 4.4* 8.6 28.2 Oberon 2SC 16 fl oz 12.8 8.0 7.2* 5.2* 0.8* 4.0* 12.0 Acramite 50WS 16 oz 60.7 16.0 17.9* 1.0* 0.9* 9.8 9.6 Fujimite 5EC 2.0 pt 10.3 8.1 3.4* 1.5 3.1* 15.5 27.8 Fujimite 5EC 1.0 pt 27.6 25.6 10.9* 2.2* 7.0* 36.4 31.4 *TSSM density is significantly different from untreated check based on Dunnett’s (P ≤ 0.05). Application rates are stated as formulated product per acre. n = 2 reps only for this treatment. No data collected previous wk due to heavy rains.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2006

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