Neem oil affects courtship signals and mating behavior of brown planthopper Nilaparvata lugens (Stål) (Hom., Delphacidae) females
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The emission of courtship signals as well as the mating behavior were impaired in brown planthopper Nilaparvata lugens females individually treated with 1, 2.5 or 5 mug of neem oil or when caged on rice plants sprayed with emulsified 3, 6 or 9 % neem oil. A few treated females failed to produce mating calls; others emitted signals unrecognizable to males. Some treated females produced 'normal' signals. However, the pulse repetition frequency increased and the duration of each call decreased at higher dosages or higher concentrations of neem oil. Even when the females mated, the neem oil treatment prolonged the premating period; the mating duration was unaffected.
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