Influence of Heterodera schachtii on Verticillium wilt symptoms in oilseed rape
1992
Groentoft, M. (Plant Protection Centre, Alnarp (Sweden)) | Jonasson, T.
The effects of a Verticillium dahliae, a Heterodera schachtii, and a combined V. dahliae and H. schachtii infestation in summer rape (cv. Topas) were studied in a glasshouse experiment. The seed yield reduction caused by V. dahliae and H. schachtii was 29 and 23 per cent respectively. A combined, simultaneous infestation (V. dahliae and H. schachtii) resulted in a 53 per cent reduction, indicating a purely additive effect of yield losses due to the two parasites. Wilt symptoms, i.e. premature leaf fall and stem necrosis, were equally expressed in the V. dahliae and V. dahliae and H. schachtii treatments. Plant height was significantly reduced in treatments which included nematodes. Stem diameter of the plants was significantly reduced in all treatments which included pathogens. The number of newly formed females on the plant roots was reduced by 30 per cent when V. dahliae was present. No synergistic effects between the fungus and the nematode in the expression of wilt symptoms could be detected, and we conclude from the experiment that the addition of nematodes will not improve the screening for Verticillium resistant plant types
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Эту запись предоставил ZB MED Nutrition. Environment. Agriculture