(Z)-9-Dodecenyl Acetate, a Component of the Sex Pheromone of Cnephasia longana Haworth (Lepidoptera: Tortricidae)

Since the end of the seventies, in the Federal R e­ public of Germany, considerable damage caused by tortricid moths of the genus Cnephasia (Lepidoptera: Tortricidae) has been observed on a number of species of cereals. Pfalz and Rheinhessen were the main gradation areas for the omnivorous leaf tier, Cnephasia longana, and cereal leaf roller, C. pumicana. In these areas, the both insect species were al­ most equally responsible for the damage. The latter, for Germany, is a new species [2], With the identifi­ cation of the chemical composition of the female sex pheromone of C. pumicana by Biwer et al. [3], it was possible to investigate the distribution of this species in the FRG [4], In the case of C. longana, only low numbers of trap catches have been reported in field trials conducted for other species using (Z)-9dodecenyl acetate (Z-9-DDA) [5], These low catches could have been casual events. However, in a screen­ ing performed in 1982, this substance proved to be extremely attractive for male leaf tier moths, there­ fore it was possible to take into consideration both Cnephasia species together in a pheromone trap sur­ vey conducted all over Germany [6].