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Several insecticides were evaluated for efficacy in controlling defoliators oi young sycamore plantations in west central Mississippi. Trees were in their second year of growth and ranged from 1.8 to 2.7 m (6-9 ft) in height. Four infested trees were selected at random for each treatment and untreated check. Foliar applications were made using a 7.6 liter handsprayer calibrated at 1.4 kg pressure/cm2 (20 lb/in2) to deliver 102.9 liter finished spray per hectare (11 gal/acre). Complete counts of all defoliator larvae were made for each test tree before treatment. Counts were comparatively low, ranging from 5 to 20 larvae per tree. Therefore, all defoliator species were combined for analysis. The percentage data were subjected to arcsine tranformation, analysis of variance, and Duncan’s new multiple range test at the 0.05 level. A separate phytotoxicitv test was conducted in 1982 in an 8-month-old plantation where trees averaged 1.4 m (4.6 ft) in height. Each chemical and rate were randomly assigned tc plots consisting of 3 trees with 3 replications. Trees were sprayed to runoff. Maximum temperatures were above 32.2°C (90°F) for the spray date and following 13 days. Phytotoxicity was evalated at 2, 7, and 16 days after treatment.

Foliar Sprays for Sycamore Defoliators, 1982 and 1984