Insect and Mite Control, 1991

• Published in: Insecticide and acaricide tests 1992-01, Vol.17 (1), p.4-4
• Main Author: Forsythe, H. Y.
• Format: Article
• Language: English
• ISSN: 0276-3656
• DOI: 10.1093/iat/17.1.4

Test materials were applied to 8-yr-old apple trees at Monmouth, Maine, as dilute sprays by handgun and hydraulic sprayer operating at 250 psi at 200 gal/acre. All treatments were made on 23 May (petal fall), 5 Jun (first cover), 18 Jun (second cover), 2 Jul (third cover), 15 Jul (fourth cover), 29 Jul (fifth cover), 13 Aug (sixth cover), and 26 Aug (seventh cover). The standard pesticide program consisted of Thiram 65 W (2.0 lb/100 gal) on 5 dates, Cyprex 65 W (6 oz) on 1 date, and Nova 40 W (2.5 oz) on 5 dates. There were no mixtures of insecticides with other pesticides. There were 8 'McIntosh' single-tree replications for each treatment. A randomized complete block design was used. Except for test trees, the orchard was not sprayed with insecticides or acaricides. On 30 Aug, up to 100 apples were picked from each tree and examined on 10 Sep for external AM egg punctures, PC egg-laying scars, and CM and LAW typical feeding injuries. ERM were counted on 25 leaves collected at chest-height around the periphery of each tree. Leaves were brought into the laboratory and brushed onto glass plates coated with a Tween 20 and alcohol mixture; mites were counted the same day. AA were counted on 10 terminals around each tree. Summer months were slightly warmer and more humid than normal, with less than adequate rainfall in Jun and Jul.