Berry, R. E.; Moldenke, A. F.; Miller, J. C.; Wernz, J. G. 1993. Toxicity of diflubenzuron in larvae of gypsy moth (Lepidoptera: Lymantriidae): effects of host plant. Journal of Economic Entomology. 86(3): 809-814.
Larvae of gypsy moth, Lymantria dispar (L.), reared on Douglas-fir,Pseudotsuga menziesii (Mirb.) Franco, were significantly more tolerant of both topicallyand orally administered diflubenzuron than were those raised on white alder (Alnusrhombifolia Nutt.). Topical administration resulted in an LD5c, of 8.96 uglg larva for larvaereared on Douglas-fir and 3.58 ilg/g larva for larvae reared on alder. The LC,os obtainedwith orally administered diflubenzuron were 0.38 ppm for larvae reared on Douglas-fir and0.07 ppm for larvae reared on alder. Topically treated females reared on either host andorally treated females reared on alder required significantly longer to pupate than didcontrols, but developmental periods of males reared on alder and both sexes reared onDouglas-fir were unaffected by oral treatment. Pupal weights were not affected by treat-ment in either sex, whether larvae were reared on Douglas-fir or alder.
KEY WORDS benzoylphenylureas, Lymantria dispar, host plant