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The phenology of the emergence of brassica pod midge (Dasineura brassicae Winn.) and its infestation of spring oil-seed rape (Brassica napus L.)

Published online by Cambridge University Press:  27 March 2009

Ingrid H. Williams ,
A. P. Martin  and
Maria Kelm
Ingrid H. Williams
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire
A. P. Martin
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire
Maria Kelm
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire
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Summary

The phenology of the emergence of brassica pod midge from overwintering sites previously sown with spring oil-seed rape and its subsequent infestation of spring rape crops was studied over 3 years. Adults emerged from the overwintering sites from mid-May until early July, but infestation of spring rape did not begin until late June. Two generations occurred on spring rape. Mature larvae dropped from the pods almost daily from early to mid-July until mid-August to early September to form cocoons in the soil. A small proportion of these larvae developed into pupae and emerged as a second generation of adults to lay further eggs in the crops. Larvae from these eggs dropped to the soil to diapause within cocoons.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 109 , Issue 2 , October 1987 , pp. 309 - 314
Copyright
Copyright © Cambridge University Press 1987

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References

Pettersson, J. (1976). Ethology of Dasyneura brassicae Winn. (Dipt. Cecidomyiidae). I. Laboratory studies of olfactory reaction to the host plant. Symposia Biologica Hungarica 16, 203–208.Google Scholar
Williams, I. H. & Martin, A. P. (1986). Evidence for a female sex pheromone in the brassica pod midge Dasineura brassicae. Physiological Entomology 11, 353–356.CrossRefGoogle Scholar
Williams, I. H., Martin, A. P. & Kelm, M. (1987). The phenology of the emergence of brassica pod midge (Dasineura brassicae Winn.) and its infestation of winter oil-seed rape (Brassica napus L.) Journal of Agricultural Science, Cambridge 108, 579–589.CrossRefGoogle Scholar