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少量(20μg/m~3)被 BNYVV 和它的媒介多粘菌(polymyza betae)侵染的土壤与种植甜菜的土壤相混合,一年内,便产生丛根病。虽然没有发现甜菜种子直接传播 BNYVV,但已发现被丛根病侵染地块所收获的种子经
A small amount (20 μg / m 3) of soil contaminated with BNYVV and its polymyza betae mixed with beet soil resulted in rhizomatous disease within one year. Although no direct transmission of beet seeds by BNYVV was found, it has been found that the seeds harvested by rhizomatous disease-infested plots