Open AccessControl of PP, 1988
Author(s) -
C. F. Fouche,
R. A. Van Steenwyk,
R. B. Elkins
Publication year - 1989
Publication title -
insecticide and acaricide tests
Language(s) - English
Resource type - Journals
ISSN - 0276-3656
DOI - 10.1093/iat/14.1.53
Subject(s) - sprayer , orchard , tray , magnification , acre , mathematics , horticulture , replicate , nymph , tree (set theory) , biology , computer science , botany , statistics , agronomy , combinatorics , artificial intelligence
The trial was conducted on 32-yr-old ‘Bartlett’ pear trees in a commercial orchard near Kelseyville, Calif. Four treatments were replicated 4 times in a randomized complete block design. Each replicate was an individual tree. Materials were applied on 12 Jul with a hand-held orchard sprayer operating at 200 psi and delivering 400 gal/acre. Control of PP nymphs was evaluated by examining under magnification 25 leaves from the top of each tree on 12 Jul, 25 Jul, 1 Aug, 8 Aug, and 15 Aug. Control of PP adults was evaluated by taking 4 standard 3-tap-beating-tray samples per tree on 8 and 15 Aug. Control of TSSM was evaluated by brushing 25 leaves/tree and counting all active mite stages under magnification on 25 Jul.
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