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METHODS FOR IMPROVING BOTH THE QUANTITATIVE AND QUALITATIVE ASPECTS OF REARING DELIA BRASSICAE FOR STERILE RELEASE PROGRAMMES

The method of rearing Delia brassicae (Bouché) on rutabaga, one of its favoured host‐plants, was improved and partly mechanized. During 3 months in 1978, about 2 million pupae were produced at an approximate cost of 720 U.S. The pupal yield averaged 50% of the number of eggs inoculated. Special attention was given to the number of eggs inoculated/g of plant food, to the conditions used during the rearing process and to the choice of a substrate suitable for larval pupation. The pupae were maintained at laboratory temperature until the first adults emerged and then they were stored for a maximum of 24 days at 3°. When such pupae were returned to laboratory temperatures, flies emerged from about 62% of them within 7days. A system for marking and collecting the emerging adults is described. The effects that rearing, storage, irradiation, marking and handling had on the quality of the adult flies are discussed.