摘要:
作者选用优质稻感、抗品种晚35与荆糯6号,晚36与南保早,86-70与建154以用种量1:1进行混栽控瘟研究,防穗颈瘟效果在55.13%～62.66%之间,增产幅度为11.93%～19.87%.菌株和小种测定结果,混栽区以ZB和ZC群小种为主,占79.2%;混栽区中的菌株侵染率较单栽区减少了7.6%,且ZB13小种的侵染率降低54.4%以上,其再侵染率低于20.0%.研究表明,水稻混栽对控瘟、增产效果明显,采用混栽控瘟的方法可降低菌株(或小种)的侵染率和抑制致病性强的菌株(或小种)繁殖,并减轻其再次侵染。
关键词:
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稻瘟病 /
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生理小种 /
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混栽 /
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控瘟
Abstract:
In this paper,the suppression of rice blast disease by mixed planting susceptible varieties of high-quality rice with resistant varieties was studied.With the mixed match I to 1,Wan 35 to Nanbaozao,86 70 to Jian 154 were compared.The disease-controlled effect of neck blast were up to 55. 13%～62.66%,and the yield increased by 11. 93%～19.87%, The examining results to iso- lates and races showed. the races ZB and ZC groups in mixed planting plot were majority,and occu-pied 79.2%,the infecting rate of isolates was decreased by 7.6%, the infecting rate of ZB13 race was reduced more than 54.45%, and the re-infecting rate of ZB13 race was lower than 20.0%. The study showed that effects of controlling blat and increasing yield were significant by using mixed planting rice varieties,because the planting practice reduced the infecting rate of isolates(or race),suppressed the reproduction of the isolates(or races)with strong pathogenicity,and thus reduced their re-infection.
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