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PRE-BLOOM CONTROL OF PEAR PSYLLA, 2001

PRE-BLOOM CONTROL OF PEAR PSYLLA, 2001 (A60) PEAR: Pyrus communis L., 'Bartlett' J. E. Dunley, B. M. Greenfield, and L. H. Bennett Tree Fruit Research and Extension Center Washington State University 1100 N. Western Avenue Wenatchee, WA 98801 Phone: (509) 663-8181, ext. 236 Fax: (509) 662-8714 E-mail: dunleyj@wsu.edu Pear psylla (PP): Cacopsylla pyricola Foerster Various materials were used at different rates and pre-bloom timings to control PP on 'Bartlett' pears during the early part of the season. Treatments were applied to single-tree plots replicated four times in an RCB design. Treatments were applied with a handgun sprayer at 400 psi to the point of drip at a spray volume of » 200 gpa. Application dates were 19 Mar delayed dormant (DD), 12 Apr cluster bud (CB), and 17 Apr popcorn (PC). PP adult counts were made using a beating tray and counting the number of adults on four tray samples per tree. PP egg and nymph counts up through 1 May were made by collecting five spurs per tree and examining them under magnification and counting the number of eggs and nymphs. Starting on 9 May, 25 leaves were collected from each tree, and were brushed with a standard mite-brushing machine onto a glass plate. Plates were examined under magnification and the number of egg and nymphs recorded. Dimilin and Esteem at CB timing provided some control of PP eggs (Table 1). Pyramite at the high rate provided the best control of PP eggs for timing at PC. This was followed by Actara, also at the high rate. Control of nymphs began to appear 3 wk after CB and PC applications (Table 2). All CB and PC applications provided short-term control with the high rate of Actara providing the best and longest. Adult numbers (Table 3) were best affected by the high and low rate of Pyramite. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

PRE-BLOOM CONTROL OF PEAR PSYLLA, 2001

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/27.1.A60
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Abstract

(A60) PEAR: Pyrus communis L., 'Bartlett' J. E. Dunley, B. M. Greenfield, and L. H. Bennett Tree Fruit Research and Extension Center Washington State University 1100 N. Western Avenue Wenatchee, WA 98801 Phone: (509) 663-8181, ext. 236 Fax: (509) 662-8714 E-mail: dunleyj@wsu.edu Pear psylla (PP): Cacopsylla pyricola Foerster Various materials were used at different rates and pre-bloom timings to control PP on 'Bartlett' pears during the early part of the season. Treatments were applied to single-tree plots replicated four times in an RCB design. Treatments were applied with a handgun sprayer at 400 psi to the point of drip at a spray volume of » 200 gpa. Application dates were 19 Mar delayed dormant (DD), 12 Apr cluster bud (CB), and 17 Apr popcorn (PC). PP adult counts were made using a beating tray and counting the number of adults on four tray samples per tree. PP egg and nymph counts up through 1 May were made by collecting five spurs per tree and examining them under magnification and counting the number of eggs and nymphs. Starting on 9 May, 25 leaves were collected from each tree, and were brushed with a standard mite-brushing machine onto a glass plate. Plates were examined under magnification and the number of egg and nymphs recorded. Dimilin and Esteem at CB timing provided some control of PP eggs (Table 1). Pyramite at the high rate provided the best control of PP eggs for timing at PC. This was followed by Actara, also at the high rate. Control of nymphs began to appear 3 wk after CB and PC applications (Table 2). All CB and PC applications provided short-term control with the high rate of Actara providing the best and longest. Adult numbers (Table 3) were best affected by the high and low rate of Pyramite.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2002

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