Abstract
Cruciferous crops have been investigated for resistance to turnip root fly (Delia floralis Fallén) in northern Sweden. Resistance variation has been demonstrated in field trials by observations of wilting symptoms, differences in green mass yield, root damages, surviving plants and number of eggs. Laboratory methods for resistance studies and plant selections in controlled environment are presented, and a method for rearing of flies is described. The definitions of antixenosis, antibiosis and tolerance are discussed, and suggestions for resistance breeding presented.
Highlights
The turnip root fly (Delia floralis Fallen) is the most severe pest of Cruciferous crops in the northern parts of Fennoscandia, while the closely related cabbage root fly (D.brassicae Floffm.) is of minor importance
The local distribution is partly determined by the preference of the turnip root fly for light soils and the preference of the cabbage root fly for heavy soils
The turnip root fly occurs in almost the whole of North Europe with a main distribution area in Fennoscandia, Scotland and North Germany
Summary
The turnip root fly (Delia floralis Fallen) is the most severe pest of Cruciferous crops in the northern parts of Fennoscandia, while the closely related cabbage root fly (D.brassicae Floffm.) is of minor importance. Index words: turnip root fly, antixenosis, antibiosis, tolerance, resistance breeding The wilting symptoms indicate considerable differences between crops in the resistance to turnip root fly. The relalive yield of untreated plants in comparison with pesticide-treated plants within a cultivar is under these conditions used as a measure of resistance to turnip root fly.
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