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Attractivity of 3.13‐octadecadien‐1‐01 acetates to the male clearwing moth Synanthedon myopaeformis (Borkhausen) (Lepidoptera, Sesiidae)

The clearwing moth Synanthedon myopaeformis occurs throughout Europe. In the last few years it has become a pest insect of increasing importance in many apple and some pear orchards. The larvae eat irregular holes between the wood and the bark of the trees and live there for 2 years then penetrate the bark, and pupate so that the emerging moths can escape and fly away. The empty pupal skins remain extending about 0.5 cm from the tree. They can be found and counted rather easily. Trees are weakened by the activity of the larvae. In Western Europe such trees, weakened by many wounds, are much more vulnerable to infestations of fungal diseases such as canker. Because the larvae are well protected, spraying with insecticides has not been very successful to date. More knowledge of the flight activity period and of the population density of the moths in the orchard could be of importance for the development of more effective control methods (Van Frankenhuyzen, 1977; Vanwetswinkel & Soenen, 1977; Vanwetswinkel, 1977). Sex attractant traps are an easy means of collecting this information and therefore we set out to discover a sex attractant for S. myopaeformis. The sex pheromones of two related species have been identified by Tumlinson et al. (1974). They isolated trans-3,cis-l3-octadecadien-l-01 acetate (tram-3, cis-13ODDA) from the female lesser peach tree borer, Synanthedon pictipes (Grote & Robinson) and cis-3,cis-I 3-octadecadien-l-01 acetate (cis-3,cis-13-ODDA) from the female of the peach tree borer Synanthedon exitiosa (Say). Traps baited with cis-3,cis-I 3-ODDA contaminated with trans-3,cis-13and cis-3,trans-13-ODDA (up to 7%) were about nine times more attractive for S. exitiosa than traps baited with pure cis-3,cis-l3-ODDA (Nielsen et al., 1975). This has recently been investigated in more detail by Barry et al. (1978). We baited traps with different ratios of isomers of 3,13-ODDA and hung them in