部分鲜食葡萄品种霜霉病抗性田间调查

Resistance of some fresh-eating grape species to the downy mildew,Plasmopara viticola

以54个鲜食葡萄品种为试材,调查统计不同葡萄品种的霜霉病发病程度、发病速率、落叶率和新梢成熟度。结果表明,不同葡萄品种对霜霉病的抗性存在明显差异,欧美杂种品种群的葡萄对霜霉病的抗性显著高于欧亚品种群;病情指数与落叶率、新梢成熟度呈极显著的相关性,与发病速率之间关系不显著。

The infective degree, infective rate, defoliation rate, and shoot maturation degree of different species of grapes were investigated using 54 fresh-eating grape species as materials. The results showed that there were significant differences in the resistance to the grape downy mildew among the species. The resistance of the cultivar Vitis vinifera L. X V. labrusca L. to the grape downy mildew was significantly higher than that of V. vinifera L.. There was a significant correlation between infective index and defoliation rate and shoot maturation degree, but no significant correlation was observed between infective index and infective rate.