2010年江华县水稻南方黑条矮缩病发生特点及影响因子的探讨

Occurrence Characteristics and Influence Factors of Southern Rice Black-streaked Dwarf Virus Disease in Jianghua County in 2010

为了有效地防控南方黑条矮缩病(SRBSDV),于2010年调查了该病在江华县早、中、晚稻上的发生情况、主要症状。结果表明:早稻SRBSDV发生面积虽大,但发病程度轻,主要因为感染局限在本田;中稻发病重是因为在秧田3叶期遇上了传毒飞虱成虫迁入的高峰。根据调查结果分析了传毒昆虫、栽培方式、气象条件以及化学防治对SRBSDV发生的影响,并讨论了江华县SRBSDV病株的3种特殊症状。最后提出了监测病情,"治虱防矮",抓住2～4叶关键防治时期等防控建议。

In order to prevent and control the southern rice black-streaked dwarf virus （SRBSDV） disease effectively, the occurrence situations and main symptoms of SRBSDV on early rice, middle rice and late rice were investigated in Jianghua County, Hunan Province in 2010. The results indicated that the occurrence area of SRBSDV on early rice was large, but the damage level was low, the main reason was the early rice plants were infected in the same paddy-field; the middle rice suffered the heaviest yield loss because immigration peak of white-backed plant-hopper showed in nursery at 3-leaf-age. Then, the influences of virus transplanting insect： cultivation mode, weather condition and chemical control on SRBSDV occurrence were analyzed according to the investigation results, and three special symptoms of SRBSDV in Jianghua County were discussed. In the end, some control suggestions were suggested, such as monitoring disease situations, control plant-hopper and prevent dwarf, especially application of insecticides to kill vector planthopper at 2- 4-leaf-stage of rice, etc..