Escape from disease is a hazard of all programs concerned with development of resistant varieties.

对所有抗病毒品种培育规划来说,避病是一种危险.

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Breeding disease - resistant varieties is the main approach for rice blast control.

抗病品种的选育是防治稻瘟病的主要途径.

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It is also an efficient measure to use resistant varieties and adjust the sowing time.

选择抗病品种或调节播期均不失为防治玉米粗缩病的有效措施.

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