The transovarial virus in 1st and 4th generations of congenital viruliferous insects can cause the second infection.
第1、4代经卵带毒虫还能分别引起早、晚稻再次侵染。
The transovarial virus in 1st and 4th generations of congenital viruliferous insects can cause the second infection on early and late rice respectively.
