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Field Movement of Radioactively Labelled Adults of Dasyneura brassicae Winn. (Dipt., Cecidomyiidae)

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image of Insect Systematics & Evolution

With the use of the radioisotope marking technique, comprehensive studies on the short range dispersal of the Brassica Pod Midge (Dasyneura brassicae Winn.), a serious pest of oil turnip and rape, were carried out in Central Sweden. Thousands of midge-infested pods each year were labelled, and later placed in the experiment area. In studying the spread of the resulting radioactive adults of the midge sweep net samples were taken; net traps fixed firmly at different levels above ground were also used. Above fallow areas, as well as in the open air above the vegetation in e.g. cereal areas, the dispersal in both sexes takes place mainly or entirely in the direction of the wind, even when the midges are exposed to air movements showing a velocity as low as i or 2 m per sec. or perhaps still less. In the males, and sometimes also in the females, there is a similar relationship between the dispersal and the wind down in the vegetation. However, in wind-sheltered spaces, e.g. in the upper part of the vegetation layer, large numbers of females frequently approach and enter fields suitable for egglaying more or less against the wind. From the applied point of view the results are of considerable interest e.g. in connection with prognostic work.

Affiliations: 1: National Swedish Institute for Plant Protection, I7I 07 Solna 7, Sweden


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