Abstract
Airplane spray tests were conducted in New Jersey to determine the efficacy of LV applications of Sevin 4-oil® at a dosage rate of 1 pt Sevin 4-oil (½ lb AI) plus 2 oz kerosene/acre against Porthetria dispar (L.). A variety of sampling methods was used to evaluate effectiveness of the carbaryl application including frass, larval and egg mass counts, as well as net changes in defoliation levels, in both treated and untreated areas. Comparisons in 3 treated blocks with untreated checks, using 1-ft tar paper squares, showed reduction of frass, larvae, and egg masses averaging 83.8, 87.3, and 87.6%, respectively. An additional egg mass count on all trees within 1/40th acre plots showed an average reduction of 93.1% considering all 3 treated blocks. Defoliation levels remained at relatively light, stable levels in the treated areas whereas up to 75% defoliation occurred on host trees in the untreated area. The test demonstrated that satisfactory gypsy moth population reduction and foliage protection can be obtained using ½-1b dosage rates of carbaryl.
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