MORPHOLOGICAL ABERRATIONS INDUCED BY METHOPRENE, A JUVENILE HORMONE ANALOGUE, IN ANOPHELES DIRUS S.S. AND AN. SAWADWONGPORNI (DIPTERA: CULICIDAE)

SUPAPORN RATANATHAM, WANWADEE ROJANASUNAN, AND E. SUCHART UPATHAM

ABSTRACT: Effect of Methoprene (isopropyl 11-methoxy-3,7, 11- trimethyldodeca-2, 4-dienoate), a juvenile hormone analogue, on Anopheles dirus s.s and An. sawadwongporni were investigated under laboratory conditions (28^o 1.7^o C, 86 3% RH, and 12-h light-dark photophase). Methoprene induced a wide range of morphogenetic aberrations in the 24-h egg treatment in both An. dirus s.s. and An. sawadwongporni The majority of mosquito populations died as pupae exhibited various degrees of morphogenetic aberrations. Several other morphogenetic aberrations were noted and were grouped into eight categories according to the stage of death. No significant difference of hatchability of both species was detected when different concentrations of Methoprene between 0.0001 mg/I and 1 mg/I were studied (P<0.5).

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Department of Biology, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand.

Received November 1, 1994