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Male orientation inhibitor of cotton bollworm: inhibitor effects of alcohols in wind-tunnel and in the field


Entomologia Sinica 4(2): 173-181
Male orientation inhibitor of cotton bollworm: inhibitor effects of alcohols in wind-tunnel and in the field
The inhibitory effects were studied of several alcohols from the male hair pencil of Helicoverpa armigera on conspecific male behaviour responses. In a wind tunnel at 26 degrees C, 50% RH, wind velocity 0.3 m/s and red light intensity 0.5 lux, males were exposed to alcohols at doses of 4 x 10-4 to 40 micro g. The greatest response by males was observed to binary components of (Z)-9-hexadecenal and (Z)-11-hexadecenal in a ratio of 5:95 and a dosage of 0.4 micro g. When (Z)-11-hexadecanol was added to a 0.4 micro g dose of this binary blend, 5% of the alcohol completely inhibited male orientation behaviour. Further increase of the percentage of alcohol in the binary blend inhibited not only orientation but also takeoff behaviour. Comparisons among (Z)-11-hexadecanol and 3 other saturated alcohols, tetradecanol, hexadecanol and octadecanol and the structurally similar compound (Z)-9-hexadecanol indicated that (Z)-11-hexadecanol was the most effective in inhibiting male orientation. In field cages on cotton in Shanghai, China, (Z)-11-hexadecanol was applied on the abdomen of virgin females, on plastic tubes in the cotton canopy and by spraying on leaves. The latter 2 methods resulted in a decrease in egg hatch from 34 to 17%.


Accession: 002889481

DOI: 10.1111/j.1744-7917.1997.tb00087.x



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