1992～1996年对水稻橙叶病的发生流行条件进行广泛深入调查研究。结果证明,当地水稻品种全属感病和高感品种,人工接种发病率(10株/10虫)为40％～93.3％,只有几个新近引进或准备推广的品种属抗病或高抗。秧苗尤以3～5叶龄期最易感病,6叶龄后抗耐病性逐渐增强,在分蘖盛期后病株基本死亡。此后感病株一般不显症,但可作为翌年早稻的初侵染源。晚季稻比早季稻发病早、受害重。晚季秧播植期推迟的大多发病较轻,但由于种种原因,该措施不易推广。秧苗田喷稻虱净4次的远比喷药3次的防病效果好,更比喷药2次和1次的好得多。 From 1992 to 1996, the epidemic conditions of orange leaf disease were extensively investigated. The results showed that the susceptibility and susceptible varieties of the local rice varieties were 40% -93.3% of the incidence of artificial inoculation (10 plants / 10 insects). Only a few newly introduced or prepared varieties were resistant or highly resistant. The seedlings were most susceptible to the disease in 3 to 5 leaf stages, and the resistance to disease was gradually enhanced after 6-leaf stage. The disease-causing plants basically died after the tillering stage. The susceptible strain is generally not significant, but can be used as the early source of early rice the following year. Late rice is earlier than the early rice and harms seriously. Late seedling planting delay most of the lesser onset, but due to various reasons, the measure is not easy to promote. Sprayed rice seedlings Squadus net 4 times far better than spraying 3 times the disease prevention effect is better than spraying 2 times and 1 times much better.