禾谷类作物和多种牧草的田间生长的杂草,从它们的枯萎部分分离出几种能抑制杂草生长的微生物。美国按下述处理将各种菌种对杂草的影响进行了一系列生长试验:1.将灭菌的谷类作物种子种在有杂草残体的田地上,它们是用纯的真菌感染过的;2.病原菌在杂草发芽或开花期施入湿土中;3.用病原菌细胞的悬浊液喷杂草。供试的菌种中有四种具有中等毒力,并在高温条件下能完全抑制杂草生长,其中以Sclerotium Yolfsi菌种最有效。无 Weeds grown in the field of cereal crops and multiple forages have isolated from their wilted fraction several microorganisms that inhibit the growth of weeds. The United States conducted a series of growth tests on the effects of various species of weeds on the following treatments as follows: 1. Seeds of the sterilized cereals were planted in fields with weed residues, which were infected with pure fungi ; 2 pathogenic bacteria in the weed germination or flowering period into the wet soil; 3 with the pathogen bacteria suspension sprayed weeds. Four of the tested strains were moderately toxic and completely inhibited the growth of weeds at high temperatures, most notably the Sclerotium Yolfsi strain. no