植物病毒病害造成重大的经济损失。

Plant virus disease brings great economical damage.

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病毒病害是影响其产量和品质的重要因素，对梨造成了严重的危害。

Virus disease is one of the important factor which affects the yield and the quality and lead to the serious reduction of output in pears.

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防治这一病毒病害的最有效途径就是培育和种植抗BYDV的优良品种。

The most efficient way of the control of such virus disease is to breed and plant good cultivars with high resistant to BYDV.

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