它们吸食植物的汁液，直接造成损害，并间接地传播病毒病。
They cause damage directly, by consuming plant juices, and indirectly, by spreading viral diseases.
这种病毒(植物双生病毒)加速了害虫的迅速繁殖，从而促进了自身的传播。
The virus, then, helps the insects multiply and in doing so helps itself to spread.
介体线虫传播植物病毒专化性的研究已取得很大进展。
Study on the specificity in the transmission of plant virus by vector nematodes has made great progress.
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