接触蜈蚣和(热带)有毒的千足虫 Contact with centipedes and venomous millipedes (tropical)
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.
第1、4代经卵带毒虫，还能分别引起早、晚稻再次侵染。 以早栽双季晚稻和杂交晚稻发病最重，其主要感染期是在本田初期。
The transovarial virus in 1st and 4th generations of congenital viruliferous insects can cause the second infection on early and late rice respectively.
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