杂交水稻发生黑条矮缩病后的应急补救技术研究

田间对比试验表明,作为一项应急补救措施,在病田进行水稻掰蘖补栽(丛),是当前黑条矮缩病发生流行以后最有价值的农业防治技术。掰蘖补栽处理所挽回的稻谷损失随病田发病率的上升而增加。丛病率为10%的杂交晚稻本田经掰蘖补栽后,可增产稻谷25.26kg/亩(约30元),而掰蘖补栽的工时费不足10元。因此,在病害流行年份,本田初期丛病率10%以上的杂交晚稻病田,均值得进行掰蘖补栽的防治工作。

Study on the emergent control measure against rice black streaked dwarf in hybrid rice fields

It was shown by comparison experiments in fields that as one emer ge ncy measure, replanting with disease-free tillers in disease fields was the mo st effective technique of agricultural control after the occurrence of rice blac k-streaked dwarf. Losses retrieved by using the measure were increased along w ith the rise in disease percentage. The yield per mu increased 25. 26 kg (RMB 3 0 yuan) in the hybrid late rice fields where the disease rate of rice cluster wa s 10% and the measure was applied. However, the cost of replanting was only 10 yuan. So, in the year when the disease spread around, the measure was well wort h applying in hybrid late rice fields where the disease rate of rice cluster was 10% higher in the early days of field stage.