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CODLING MOTH CONTROL IN PEARS, 2001

CODLING MOTH CONTROL IN PEARS, 2001 (A66) PEAR: Pyrus communis (L.), 'Bartlett' R. A. Van Steenwyk and R. M. Nomoto Department of ESPM University of California 201 Wellman Hall Berkeley, CA 94720-3112 Phone: (510) 643-5159 Fax: (510) 642-4879 E-mail: bobvanst@nature.berkeley.edu Codling moth (CM): Cydia pomonella (L.) Pear psylla (PP): Cacopsylla pyricola Foerster European red mite (ERM): Panonychus ulmi (Koch) Twospotted spider mite (TSSM): Tetranychus urticae Koch San Jose scale (SJS): Quadraspidiotus perniciosus (Comstock) A trial was conducted on mature 'Bartlett' pear trees in a commercial orchard near Fairfield, CA. Fifteen treatments were replicated four times in an RCB design. Each replicate consisted of an individual tree. Treatments were applied with a hand-held orchard sprayer operating at 250 psi and delivering 200 gpa of finished spray (2.87 gal/tree). Application timings were based on degree-days (DD) (Table 1). Degree-days were calculated with a 27-Mar biofix for the first generation and a 10-Jun biofix for the second generation using a single sine horizontal cutoff model with a lower threshold of 50°F and an upper threshold of 88°F. Maximum and minimum air temperatures were obtained from the IMPACT weather station near Cordelia, CA. Control of the first CM generation (overwintering flight) was evaluated on 6 Jun, and control of the second generation (summer flight) was evaluated at commercial harvest on 24 Jul for CM infestation by inspecting a maximum of 250 fruit per replicate. Control of motile TSSM, ERM, SJS crawlers, and PP nymphs was evaluated weekly from 15 May through 16 Jul by sampling 10 exterior and 10 interior leaves per replicate. The leaves were brushed and the motile TSSM, ERM, SJS crawlers, and PP nymphs were counted under magnification (20´). This trial was conducted against a very high CM population with >70% of the fruit infested at harvest in the untreated check (Table 2). The grower standard of Imidan and Guthion plus Agri-Mek, Dimilin, or Esteem provided the best CM control. Assail with or without horticultural oil and Calypso preceding or following Intrepid provided acceptable CM control. and Novaluron, and Dimilin had increased levels of SJS as compared with the grower standard of Agri-Mek plus Guthion and Imidan. No phytotoxicity was observed with any experimental treatment. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CODLING MOTH CONTROL IN PEARS, 2001

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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
DOI
10.1093/amt/27.1.A66
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Abstract

(A66) PEAR: Pyrus communis (L.), 'Bartlett' R. A. Van Steenwyk and R. M. Nomoto Department of ESPM University of California 201 Wellman Hall Berkeley, CA 94720-3112 Phone: (510) 643-5159 Fax: (510) 642-4879 E-mail: bobvanst@nature.berkeley.edu Codling moth (CM): Cydia pomonella (L.) Pear psylla (PP): Cacopsylla pyricola Foerster European red mite (ERM): Panonychus ulmi (Koch) Twospotted spider mite (TSSM): Tetranychus urticae Koch San Jose scale (SJS): Quadraspidiotus perniciosus (Comstock) A trial was conducted on mature 'Bartlett' pear trees in a commercial orchard near Fairfield, CA. Fifteen treatments were replicated four times in an RCB design. Each replicate consisted of an individual tree. Treatments were applied with a hand-held orchard sprayer operating at 250 psi and delivering 200 gpa of finished spray (2.87 gal/tree). Application timings were based on degree-days (DD) (Table 1). Degree-days were calculated with a 27-Mar biofix for the first generation and a 10-Jun biofix for the second generation using a single sine horizontal cutoff model with a lower threshold of 50°F and an upper threshold of 88°F. Maximum and minimum air temperatures were obtained from the IMPACT weather station near Cordelia, CA. Control of the first CM generation (overwintering flight) was evaluated on 6 Jun, and control of the second generation (summer flight) was evaluated at commercial harvest on 24 Jul for CM infestation by inspecting a maximum of 250 fruit per replicate. Control of motile TSSM, ERM, SJS crawlers, and PP nymphs was evaluated weekly from 15 May through 16 Jul by sampling 10 exterior and 10 interior leaves per replicate. The leaves were brushed and the motile TSSM, ERM, SJS crawlers, and PP nymphs were counted under magnification (20´). This trial was conducted against a very high CM population with >70% of the fruit infested at harvest in the untreated check (Table 2). The grower standard of Imidan and Guthion plus Agri-Mek, Dimilin, or Esteem provided the best CM control. Assail with or without horticultural oil and Calypso preceding or following Intrepid provided acceptable CM control. and Novaluron, and Dimilin had increased levels of SJS as compared with the grower standard of Agri-Mek plus Guthion and Imidan. No phytotoxicity was observed with any experimental treatment.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2002

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