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Biology of the codling Moth Cydia (Carpocapsa = Laspeyresia) Pomonella L. (Olethreutidae, Lepidoptera) and effect of fruit age on its diapause induction

Published online by Cambridge University Press:  27 March 2009

F. M. El-Gamil ,
I. A. Gaaboub  and
S. K. El-Sawaf
F. M. El-Gamil
Affiliation:
Entomology Division, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
I. A. Gaaboub
Affiliation:
Entomology Division, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
S. K. El-Sawaf
Affiliation:
Entomology Division, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
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Summary

The number of generations and the durations of the developmental stages of the codling moth (Cydia pomonella L.) that fed on fresh pear fruits were studied during a whole year, 1973, under laboratory conditions. In the next year, diapause of larvae was investigated in relation to the larval food.

Results showed that this insect reproduced four generations on pear fruits under laboratory conditions and diapaused during the whole period of the autumn. Broods of these generations occurred during April, June, July and September, respectively.

There was a suggestion that the larval food affected the induction of diapause in this insect. About 83% of larvae which fed on ‘ripe native Volos apples’ diapaused as early as the second half of June although the majority of larvae (93%) which fed on ‘immature pears’ continued development to adults and only 7% began to diapause under the same conditions. Up to 98% of larvae which fed on ‘fully mature ripe pears’ did not develop beyond the cocooning stage until the following spring, but 88% of larvae fed on immature pears stored at 4 °C for about 3 months reproduced a new generation about the end of October. These variable results should be attributed to the nourishment on different host-fruits in different maturity stages.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 90 , Issue 1 , February 1978 , pp. 233 - 236
Copyright
Copyright © Cambridge University Press 1978

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References

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