Apple, Test of Acaricides, 1977 | Zendy

Larry A. Hull | Zendy; Dean Asquith | Zendy

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Apple, Test of Acaricides, 1977

Author(s) -

Larry A. Hull,

Dean Asquith

Publication year - 1978

Publication title -

insecticide and acaricide tests

Language(s) - English

Resource type - Journals

ISSN - 0276-3656

DOI - 10.1093/iat/3.1.29

Subject(s) - sprayer , acaricide , horticulture , spider mite , population , randomized block design , orchard , mite , toxicology , panonychus ulmi , captan , mathematics , biology , botany , agronomy , fungicide , medicine , environmental health

Experimental sprays were applied to run-off to single-tree plots in a randomized block design with 2 replicates of Golden Delicious and 2 Red Delicious, both spur-type trees. Experimental sprays were applied with a spraygun from a truck-mounted John Bean sprayer equipped with a 35 gpm pump on June 13, July 8 and July 22 to all plots. General purpose sprays of 1.5 lb captan 50W, 0.25 lb Guthion 50W, and 1 lb Sevin 50W/100 gallons dilute were applied at intervals of ca. 2 weeks throughout the summer. Average temperatures were: May 63.88°F, June 66.23°F, July 74.34°F, and August 72.67°F. Rainfall in inches averaged: May 0.88, June 2.91, July 5.75, and August 2.57. Effectiveness of the test chemicals on the European red mite, twospotted spider mite, and A. fallacis was evaluated by making several counts of mites on random samples of 20 leaves/tree, 80 leaves/treatment. Mite population pressure was moderate throughout the season.

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