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在北海道已检测出寄生性不同的4个系统的P.betae。其中寄生于西风谷、马齿苋的,分别被鉴定为f.sp.amaranthi、f.sp.portulacae。甜菜菌株和藜菌株的寄生性与加拿大的报道不同,故尚未确定其分化型。为此,比较了加拿大产的藜菌株、中华人民共和国产的甜菜菌株及北海道产菌株的形态和寄生性。接种时,把检测植物放入特制试管内沙培,在其根周围注入各菌株的休眠孢子团10~4个。接种植
In the Hokkaido have detected a parasitic different 4 systems P.betae. Which parasites in the Valley of the Westerly, purslane, were identified as f.sp.amaranthi, f.sp.portulacae. The parasitism of beet strains and vetch strains is different from that reported in Canada, so the differentiation type has not been established yet. For this purpose, the morphology and parasitism of the strains of vetch from Canada, beet strains from the People’s Republic of China and strains from Hokkaido were compared. At the time of inoculation, the test plants were put in sand culture in a special test tube and 10 to 4 resting spore clusters of each strain were injected around their roots. Inoculation