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The cabbage root fly ( Hylemyia hrassicae Bouche) and the turnip root fly (Hylemyia floralis Fall.) are the most important pests occuring in the crucifers in Finland. The larvae live in the underground parts of the plants burrowing channels in them and often causing considerable losses in yield. The abundance and severity of damage varies in different years, as well as in different species and varieties. According to inquiries instituted in Sweden (1), the early varieties of the turnip were attacked more severely than the late ones, likewise the round ones more than the long ones. According to Morison (2), the hard varieties of the turnip and swede became less damaged than the soft ones. This is due to the ability of the former better to resist the aftereffect of affect, for the calculations done on the amounts of the pupae on the surface of the hard and the soft varieties have shown that the numbers are approximately equal. Reichelt (3) has on the basis of his investigations on red cabbage, concluded that susceptibility is not a characteristic of any specific variety, for although the distinct differences between the different varieties can be noted in a year their order varies to a notable degree in different years. Salonen (4) states that according to his observations at Inari (lat. 69°5’ N) the roundish big-leafed turnips with dense foliage are distinctly more resistent against damage caused by the cabbage maggots than the flatround ones, as the root of the first is stouter and more amply branching. The larvae can easily cut through the thin root of the flat-round turnip and the plant withers. In the years 1951—1955 the damage caused by the cabbage maggots to the different varieties of big-leafed turnip (Brassica rapa L. v. rapifera Metzg.) was studied at Tikkurila (lat. 60°20' N and long. 25°30' E). The examinations were made on the varieties used in the field tests at the Agricultural Research Centre, Department of Plant Husbandry. A total of 200 turnips of each variety was examined. The varieties used in tests for several years will be examined first. The following varieties of big-leafed turnip were in general cultivation:

On the susceptibility of the different varieties of big-leafed turnip to damage caused by cabbage maggots (Hylemyia spp.)