In 1961, trichlorfon as a 4 lb per gallon ultra-lowvolume formulation of Dylox® was applied by air at the rate of 1.8 pints (0.9 lb active ingredient) per acre for the control of gypsy moth in a 22-acre mixed deciduous woodlot in the upper Hudson Valley of New York State. A similar unsprayed woodlot in the same general area served as a check.

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J. D. Gilpatrick, J. Terrill, Control of the Gypsy Moth with Trichlorfon Applied VLV by Aircraft in New York State in 1967, Journal of Economic Entomology, Volume 63, Issue 1, 1 February 1970, Pages 15–18, https://doi.org/10.1093/jee/63.1.15

Trichlorfon disappeared quickly from clover and strawberry samples collected in the treated area and little residue was left 1-2 weeks after application. The insecticide also decomposed quickly in water samples of pH 6.9 under laboratory conditions. No toxicity to bees in hives at the edge of the treatment area was observed. It is concluded that trichlorfon is a promising insecticide for gypsy moth control when applied by air, with a minimum risk of environmental contamination.

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Control of 2nd- and 3rd-instar larvae with trichlorfon was highly satisfactory based on well-correlated data from several types of observations in treated and untreated plots. Counts of live larvae decreased and dead larvae increased markedly following treatment. Most larvae were killed within 24 hours after application. No dead larvae were found in the check area during the experiment. There was good correlation between larval counts and frass collections. An egg mass reduction of 98% was observed in the treated area, whereas an increase in egg masses of 44% occurred in the check area during 1967.

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