从田间试验和大田普查结果表明,杂交稻不同组合对水稻普通矮缩病的抗性存在极显著差异。特优420、冈优22等组合抗性差,发病株率高达21%以上;而D优63、特优77、协优9308、D优68等组合抗性较强,病株率仅0.75%～3.4%。因此,引进推广杂交稻新组合之前必须做好品种抗性鉴定工作。 Field experiments and field census results showed that there were significant differences in the resistance of different combinations of hybrid rice to common dwarf rice disease. Teyou 420 and Gangyou 22 had poor resistance and the rate of diseased plants was over 21%. The resistance of D You 63, Teyou 77, Xieyou 9308 and D You 68 was relatively high, and the rate of diseased plants was only 0.75% 3.4%. Therefore, the introduction of new hybrid rice to promote the new combination must be made before the identification of varieties of resistance.