Purified bacterial strains that are effective for the inhibition of plant pathogens, including the fungi Rhizoctonia solani and Pythium ultimum have been isolated. These strains are useful as biocontrol agents, and can be used to produce antifungal metabolites, such as antibiotic compounds, active against the plant pathogenic fungi Rhizoctonia solani and Pythium ultimum. Both the purified bacterial strains and the antibiotic compounds can be used as active agents for biocontrol compositions. Genes that encode for one or more enzymes useful in the production of an antibiotic active against the plant pathogenic fungus Rhizoctonia solani and Pythium ultimum have been isolated and used to transform biocontrol agents which are not ordinarily effective against said fungi. The transformed biocontrol agents can be used to control Rhizoctonia solani and Pythium ultimum. Fungicidal compositions comprising the combination of an biological disease controlling Pseudomonas flurescens strain and an acylalanine fungicide are useful for controlling fungi.
已分离出能有效抑制植物病原体(包括真菌根瘤菌(Rhizoctonia solani)和白癣菌(Pythium ultimum))的纯化细菌菌株。这些菌株可用作
生物控制剂,并可用于生产抗真菌代谢物,如抗生素化合物,对植物致病真菌根瘤菌(Rhizoctonia solani)和腐霉菌(Pythium ultimum)具有活性。纯化的细菌菌株和抗生素化合物都可用作
生物防治组合物的活性剂。已分离出编码一种或多种酶的
基因,这些酶可用于生产对植物致病真菌根瘤菌(Rhizoctonia solani)和超微腐霉菌(Pythium ultimum)具有活性的抗生素,并用于转化通常对上述真菌无效的
生物控制剂。转化后的
生物控制剂可用于控制根瘤菌(Rhizoctonia solani)和白粉菌(Pythium ultimum)。由
生物病害控制假单胞菌菌株和酰丙
氨酸杀真菌剂组合而成的杀真菌组合物可用于控制真菌。