Abstract
Three pyrethroids (deltamethrin, bifenthrin and -גcyhalothrin) and four new chemistry insecticides
were tested against second instar larvae of Plutella xylostella under laboratory condition. Based on
their LC50 values, deltamethrin was most toxic than -גcyhalothrin and bifenthrin and among new
chemistry insecticides, emamectin benzoate was the most toxic followed by acetamiprid,
diafenthiuron and imidacloprid. Selection of two subpopulations for five generations with gradual
toxic exposures of deltamethrin and emamectin showed decrease in survival rate. However, there was
no drastic increase in LC50 values for both selected subpopulations than that of unselected
subpopulation. Such high cross-resistance between emamectin benzoate with deltamethrin and -ג
cyhalothrin suggest their wise use against this important insect pest. Rotational use of insecticides
with different mode of action against P. xylostella might help avoiding development of resistance.
Munir Ahmad, Huma Nazir Kayani. (2016) CROSS RESISTANCE PATTERN FOR EMAMECTIN BENZOATE AND SYNTHETIC PYRETHROIDS IN DIAMONDBACK MOTH, PLUTELLA XYLOSTELLA (L.) (LEPIDOPTERA: PLUTELLIDAE), Asian Journal of Agriculture and Biology, Volume 4, Issue 3.
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