THE Use of insect growth regulators, analogues of the juvenile hormone, against summer fruit tortrix moth, adoxophyes orana and other pests
1978
SCHMID, A. | MOLEN, J.P. | JUCKER, W. | BAGGIOLINI, M. | ANTONIN, PH.
The effectiveness of an insect growth regulator (IGR) of the juvenile hormone type (Ro 10-3108/018) was tested in field trials in 1976 against summer fruit tortrix (Adoxophyes orana F.v.R., Lepidoptera: Tortricidae) and other orchard pests. The orchards were sprayed in spring at the beginning of the last larval stage of the hibernated generation of the summer fruit tortrix. Numerous deformations were observed in larvae, pupae and adults, collected 1 to 3 weeks after treatment. The emergence of moths reared from exposed larvae and the reproduction of emerged adults were considerably reduced. In well-isolated orchards, the flight of moths of the treated generation was low, but in less isolated ones reinfestation from elsewhere was observed. The population of the next generation, which was studied in fifteen apple and two pear orchards in Switzerland and in the Netherlands, decreased markedly in well-isolated orchards. Moreover, fruit damage was no greater than that following a classical spraying programme. The advantages and disadvantages of the application of these specific insecticides in integrated control programmes are discussed.
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