Field Attractiveness of the Synthetic Sex-Pheromone of the Diamondback Moth, Plutella xylostella (L.)

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Abstract
Field attractiveness of synthetic sex-pheromone compounds were tested in cabbage fields from March-April in Tsu, Mie Prefecture [Japan]. Attractiveness of each 1 .mu.g of 7 mixtures of (Z)-11-hexadecenal and (Z)-11-hexadecenyl acetate in ratios of 10:0 8:2, 6:4, 5:5, 4:6, 2:8 and 0:10 was tested. Male moths were attracted to baits in the ratios of 6:4 to 2:8. A large number of male moths were attracted to 2 mixtures in the ratios 6:4 and 5:5. These results generally coincided with the ratio of the 2 compounds found in virgin female moths by Tamaki et al (1977). The attractiveness of 1 .mu.g of the mixture of (Z)-11-hexadecenal and (Z)-11-hexadecenyl acetate in the ratio 5:5 was generally equivalent to 5 living virgin females. (Z)-11-hexadecenal or (Z)-11-hexadecenyl acetate alone could not attract any male moths. Attractiveness of the mixture of (Z)-11-hexadecenal and (Z)-11-hexadecenyl acetate in the ratio 5:5 at the total amounts of 0.01, 0.1, 1, 10 and 100 .mu.g was tested. Male moths were attracted to mixtures of 0.1 to 10 .mu.g. At 1 .mu.g dosage a large number of males were attracted on the 1st day but not on the 2nd day, while at 10 .mu.g, activity was high on the 2nd day. The synthetic sex-pheromone compounds probably decomposed and/or evaporated rapidly on the cotton wicks. High concentrations [100 .mu.g] of the synthetic sex-pheromone compounds did not attract males. Attractiveness of traps baited with 1 .mu.g mixture of (Z)-11-hexadecenal and (Z)-11-hexadecenyl acetate was repeatedly compared with that of 5 virgin female moths from March-Nov. Number of male moths attracted by the synthetic pheromone compounds was nearly equivalent to that by virgin females at mean temperatures of about 10.degree. C in March and Nov., and somewhat less than the females at mean temperatures of about 15.degree. C in April. Synthetic pheromone compounds were considerably less attractive than females at mean temperatures of about 20.degree. C in May and June. Synthetic pheromone compounds and the females attracted a few male moths at mean temperatures of about 25.degree. C in August and the difference in attractiveness of them could not be estimated. The synthetic sex-pheromone mixture of (Z)-11-hexadecenal and (Z)-11-hexadecenyl acetate, applied in cotton wicks in the ratio of 5:5 at 1 .mu.g level was generally equivalent to 5 virgin female moths in attractiveness for males at mean temperatures of approximately 10.degree.-15.degree. C.

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