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Observations on changes in the female reproductive system of the wheat bulb fly Leptohylemyia coarctata (Fall.)

Published online by Cambridge University Press:  10 July 2009

Margaret G. Jones
Margaret G. Jones
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire, England
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Extract

In Leptohylemyia coarctata (Fall.) the germarium cuts off oocytes which develop through the stages 00 and 0 and I-V, recognised in other Cyclorraphous flies, in 4–5 weeks. All eggs of one batch of the gonadotrophic cycle ripen at the same time. After oviposition, the split intima, the remains of the follicular epithelium, and the nurse cells slowly contract to form the follicular relic. Flies swept from winter wheat during June and July and caught in water traps in July and August showed all stages of egg development. In 1970, 24·7% of the females swept from the crop had completed the first, 4–7% the second and 0–4% the third gonadotrophic cycle. All the eggs were not laid at the same time. During later gonadotrophic cycles, some ovarioles were non-functional. Flies laid one or two batches of eggs, rarely three. In 1970, many flies were attacked and killed by E. muscae. Only one out of 115 newly emerged female wheat bulb flies presented with foods usually found in the crop or citrated blood contained mature eggs after 24–27 days in small cages. Those fed only on 0·1 M glucose survived but did not deposit yolk in the ovum; those provided only with yeast paste died. Honey dew from cereal aphids was the main source of sugar. Water in droplet form and space to move seem necessary for the maturation of the eggs.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 61 , Issue 1 , October 1971 , pp. 55 - 68
Copyright
Copyright © Cambridge University Press 1971

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