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Studies on a Method of Radioactive Tagging of a Gall Midge, Dasyneura brassicae Winn. (Dipt., Cecidomyiidae)

As mentioned in an earlier paper (Sylven, I970) specimens of the Brassica Pod Midge, Dasyneura brassicae Winn., can be efficiently tagged by treating midge-infested pods with 32P. The results of the experiment dealt with in the present article indicate that about I-I I/2 μCi of 32P per g fresh weight of the pods is for this purpose an appropriate contamination level. This amount gives a high labelling effect, and seems to have no drastic influence upon the body size or the egg production of the female midges developed from larvae in the pods treated.