连晚杂交稻黑条矮缩病的发生危害特点及防治对策

Occurrence of rice black-streaked dwarf disease in late season hybrid rice and its control Strategy

水稻黑条矮缩病（ＲＢＣＤＶ）近年来在台州市连作晚稻上回升迅速，发生严重面积达１．３万ｈｍ２。试验分析表明，导致连晚杂交稻黑条矮缩病严重流行的原因主要有３个：一是大面积的主栽品种抗性差，易感病；二是传毒媒介灰飞虱的田间带毒率高，而其迁飞危害高峰与连晚杂交稻的感病生育期相吻合；三是杂交水稻自身的栽培特点有利于黑条矮缩病的侵染。根据此病发生的规律和特点，提出了在农业防治的基础上，狠抓适期治灰防病的综合治理，可取得较为明显的成效。

Rice black-streaked dwarf disease spread rapidly in a large rice area recently, and the affected areas of this virus disease were approximately 13000 hectares in Taizhou. The reasons for causing the epidemic of this viral disease were as follows: 1)the wide release of susceptible rice cultivars to this viral disease; 2) the abundance of virus vector-small brown planthopper in rice field, and its peak migration coincidence with the susceptible stage of late-season hybrid to this virus; and 3) more suitable cultivation patterns of late-season hybrid for the infection of this disease. The integrated management for this viral disease is to adjust the cropping patterns properly for preventing the transfer of virus, and to suppress the population of vector-small brown planthopper in optimal period for minimizing the spreading of this viral disease.