Moldenke, A. F. R.; Berry, R. E.; Miller, J. C.; Kelsey, R. G.; Wernz, J. G.; Venkateswaran, S. 1992. Carbaryl susceptibility and detoxication enzymes in gypsy moth (Lepidoptera: Lymantriidae): influence of host plant. Journal of Economic Entomology. 85(5): 1628-1635.
Toxicity of carbaryl and levels of detoxifying enzymes were determined inlarvae of gypsy moth, Lymantria dispar (L.), reared from hatching on either white alder,Alnus rhombifolia Nutt., or Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco. Foliarchemistry was also examined. We treated larvae topically with carbaryl 2 d into the thirdor the fifth instar and established LD50s based on survival 48 h after treatment. We fedsurviving third instars their original diet until death or pupation and assessed sublethaleffects. Levels of detoxifying enzymes were determined in larvae of the same age andrearing group. Larvae reared on Douglas-fir were significantly more tolerant of carbaryl.Sublethal effects were found only in larvae fed Douglas-fir, in which mortality after 48 hand time to pupation were significantly greater in treated larvae than in controls. Levels ofdetoxication enzymes were generally higher in tissues of larvae raised on Douglas-fir, butsignificantly higher in only a few instances. Nitrogen and total phenolic contents werehigher in alder than in Douglas-fir. Terpenes were abundant in Douglas-fir foliage butwere not detected in alder.
KEY WORDS allelochemicals, carbaryl, detoxication enzymes