Ra. Alzogaray et En. Zerba, COMPARATIVE TOXICITY OF DELTAMETHRIN AND CIS-PERMETHRIN ON FIRST INSTARS OF TRIATOMA-INFESTANS (HEMIPTERA, REDUVIIDAE), Journal of medical entomology, 33(1), 1996, pp. 58-62
We evaluated the toxicity of deltamethrin and cis-permethrin at 3 temp
eratures on instars of Triatoma infestans (Klug). After treatment, tem
perature had an important effect on LD(50)s of both insecticides, whic
h tended to decrease when temperature decreased. How ever, the effect
of temperature on LT(50)s was small. Cis-permethrin was slightly more
lethal than deltamethrin only at 26 degrees C. Lethal action of deltam
ethrin was faster than cis-permethrin at all temperatures assayed. The
toxicity of both pyrethroids was affected by the age and the nutritio
nal state of the nymphs. We evaluated sublethal effects on blood meal
ingestion and moulting. Only deltamethrin yielded a substantial decrea
se in the number of moulted nymphs.