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经过两年递级接种试验,象牙海岸在自然发病条件下观察了500个普遍水稻品种,马达加斯加在接种一个已知致病力生理小种的情况下测定了29个品种。每组试验都是从严重被侵染类型的品种一直到不被侵染类型的品种,进行了仔细观察检查。结果不论在稻瘟病的发病强度还是扩展速度方面,都是后者(原属不被侵染类型的品种)超过了前者(原为被严重侵染类型的品种)。此种现象被解释为:病原微生物在自然情况下,原来只能在被严重侵染危害
After two years of graded vaccination trials, 500 universal rice varieties were observed under natural onset in the Ivory Coast, and 29 varieties were tested in Madagascar with a known pathogenic race. Each group of tests was conducted from the type of serious infested to the non-infested type of variety and was carefully examined. The results showed that the latter (formerly non-infested species) surpassed the former (formerly heavily infested species) both in terms of the intensity of the blast and the rate of expansion. This phenomenon is interpreted as: in the natural case of pathogenic microorganisms, the original can only be severely infected with the hazards