杂交稻不同配比混栽控瘟研究Ⅱ

Study on Controlling Rice Blast by Mix-culturing Hybrid Rice Varieties in Different Match

采用地优６４与威优６４按不同比例混栽试验示范结果，１：１混播控瘟效果达５５．８１％～６６．０１％，亩增稻谷１４．６％以上，为最佳混栽配比。混栽控瘟机理测知，混栽区以ＺＣ群小种为主，占６９．７６％；对照单栽区以２８群小种为主占６４．７０％。初步认为混栽对稻瘟病菌的群体致病性有一定干扰和降低作用，从而减轻病害。

It was reported that the controlling effects on panicle blast by hybrid rice in different match were more than 22. 55%and increased yield by 14. 3 kg/mu. Our demonstrative result using mix-culture of Diyou 64 with Weiyou 64 in different match showed that the optimum match was 1:1 mix-culture of these two cultivars, which the controlling effect reached 55. 81%～66. 01%, and the yield increased more than 14.6%. The mechanism of mix-culture to control the rice blast was primarily explored. It was found that the chief physiological races in mix-culturing plots were mainly ZC group which occupied 69. 76%, In contrast, the single-culturing plots were mainly ZB group and occupied 64. 70%, The tentative conclusion of this experiment was that,the mix-culture has a certain interference to the pathogenicity of Pyricularia oryzae and decreases their function,thus lightened the harmness from the pathogen.