Spodoptera littoral

Tertiary pheromonal blends have been identified in two noctuid moths. The red bollworm, Diparopsis castanea, emits dodecyl acetate, (E)-9-dodecenyl acetate, 11-dodecenyl acetate, and (E)-9,ll-dodecadienyl acetate as a sex pheromone, whereas Spodoptera littoral is utilizes a blend made up of tetradecyl acetate, (E)-9-tetradecenyl acetate, (E)-ll-tetradecenyl acetate, and (Z,E)-9,ll-tetradecadieny1 acetate (89). For both species, the conjugated dienes are the most potent olfactory stimulants. 

Another type of insecticidal activity is antifeedant activity. A new germacranolide isolated from T. argenteum ssp. argenteum was examined for antifeedant activity against neonate larvae Spodoptera littoral is (Noctuidae). Feeding inhibition of 8a-angeloyloxycostunolide was studied by incorporation of three doses into an artificial diet (Table 9). This compound was found to show antifeedant activity, without any toxic effect itself [33]. 

On the other hand, the sex pheromones of both S. littoral is and S. litura were reported to consist of binary mixtures of (Z E)-9,11-tetradecadienyl acetate and (Z,E)-9,12-tetradecadien.yl acetate (90, 91). The presence of additional compounds in the sex pheromone blend is believed to be responsible for the sexual isolation of these two Spodoptera species from each other. 

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See also in sourсe #XX -- [ , , ]

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