Resistance in Cucumis sativus L. to Tetranychus urticae Koch. 3. Search for sources of resistance |
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| Authors: | O M B De Ponti |
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| Institution: | (1) Institute for Horticultural Plant Breeding (IVT), Wageningen, the Netherlands |
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| Abstract: | Summary After a first screening of 800 cucumber varieties, a laboratory test and a practical test, the following nine varieties have been selected for their distinguishable level of resistance to the twospotted spider mite: PI 220860,  Hybrid Long Green Pickle , PI 178885, Ohio MR 200, Taipei no 1, Robin 50, Aodai, PI 163222 and PI 218036. Besides resistance tolerance for the twospotted spider mite also appears to occur. Related Cucumis species do not seem to possess higher levels of resistance than the most resistant C. sativus varieties. The resistance-parameters acceptance and reproduction appear to be positively correlated. On resistant varieties the metabolism of the spider mites is clearly disturbed, but this seems not to be caused mainly by bitter principles. |
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| Keywords: | Cucumis sativus cucumber Tetranychus urticae twospotted spider mite resistance breeding tolerance genetic sources |
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