Abstract
Abstract Two pyrethroids and an organophosphate combination were evaluated against an untreated control in an apple block at Steeles Tavern, containing four cultivars: 'Delicious', 'Golden Delicious', 'Stayman', and 'York'. Four, single-tree replicates were used in a randomized complete block design. Applications were made using a truck-mounted Swanson sprayer with a handgun attachment. Trees were sprayed to the drip point (ca. 1869 liters/ha (200 gal/A)). Spray dates were 7 May, 30 May, 3 Jul, 17 Jul, 2 Aug and 16 Aug. STLM was evaluated on 14 Aug by counting mines seen during a 3-min examination of a tree's foliage. WALH-damaged shoots per 20 shoots on each tree were counted on 17 Sep. Population densities of both of these insects were low. Mites were evaluated using a leaf-brushing machine and 20 leaves per replicate, on 24 Jun and 14 Aug. Chlorophyll content was determined on 23 Sep using a hand-held chlorophyll meter.
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