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Abstract: The diamondback moth, Plutella
xylostella (Lepidoptera: Yponomeutidae), is a serious
threat to Brassica vegetables in Iran, including Tehran
province. The ovicidal effects of different classes of
insecticides on P. xylostella were investigated, using
three fixed doses (based on commercial formulations). At
the lowest concentration (500 mg L-1), the mortality
effect of hexaflumuron and pyridalyl was higher than the
other insecticides examined. Fipronil, hexaflumuron and
spinosad and pyridalyl, however, showed high toxic
effects at the median dose (1000 mg L-1). On the other
hand, at high concentration (2000 mg L-1), all
insecticides except lufenuron and indoxacarb (EC
formulation) caused more than 85% mortality. Overall,
these findings indicate that hexaflumuron, spinosad and
fipronil, with low active ingredients and high
mortality, could be the best choices for controlling the
P. xylostella in the egg stage.
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