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Stimuli influencing host-finding behaviour of mated female apple leafcurling midge (ALCM) were investigated by presenting females with various combinations of plant chemical and visual stimuli in a wind tunnel. First, females were presented with apple or pear foliage. Relative to pear foliage, apple foliage stimulated more females to fly upwind and to approach and land on foliage. When pear and apple foliage were placed behind a screen in the wind tunnel to minimise differences in visual cues, female ALCM continued to be more responsive to apple foliage. These results indicated that volatile chemicals from apple foliage play an important role in the host-finding behaviour of apple leafcurling midge. In subsequent tests, we determined that volatile chemicals from immature apple foliage are more stirnulatory to ALCM females than are volatiles from mature apple foliage and that these volatiles can be extracted by dipping foliage in dichloromethane for 50 seconds. Visual stimuli from foliage did not appear to play an important role in host-finding behaviour: the addition of visual foliar models to an airstream containing apple odours did not increase numbers of ALCM females taking off flying upwind, approaching, or landing.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Stimuli influencing host-finding behaviour of apple leafcurling midge (<i>Dasineura mali</i>) females