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A method for the continuous rearing of the cabbage root fly Erioischia brassicae (Bch.) and some observations on its biology

Published online by Cambridge University Press:  10 July 2009

S. Finch  and
T. H. Coaker
S. Finch
Affiliation:
National Vegetable Research Station, Wellesbourne, Warwick
T. H. Coaker
Affiliation:
National Vegetable Research Station, Wellesbourne, Warwick
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Extract

A method for continuously rearing cabbage root fly, Erioischia brassicae (Bch.) is described.

Adult flies fed on sucrose, brewers’ yeast and yeast hydrolysate laid an average of 220 eggs per female when caged together in large numbers and 376 eggs per female when caged singly. Egg viability was 86 per cent. Egg hatch was severely reduced by relative humidities of less than 90 per cent, and the embryo became more susceptible to desiccation as it matured. The larvae were reared on swede, and maximum survival was obtained when the swedes were inoculated with an optimum number of eggs calculated from the ratio of 1 egg: 1.6 g. of swede. Different ratios were obtained from turnip and winter radish indicating that survival was probably related to the nutritional value of the rearing medium as well as to its availability. An average of 68 per cent, of the eggs placed on swede produced pupae that were equivalent in size to wild pupae. The fecundity of the flies was directly related to pupal weight and to the availability of protein in their diet. Adult longevity was reduced more by mutual disturbance than by any other factor.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 58 , Issue 3 , February 1969 , pp. 619 - 627
Copyright
Copyright © Cambridge University Press 1969

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References

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