马铃薯黑痣病生防菌的筛选及防治效果

Screening and control effect of biocontrol bacteria on potato black scurf

由立枯丝核菌(Rhizoctonia solani)引起的马铃薯黑痣病由于常年连作和马铃薯种植规模扩大,病害发生越来越严重[1,2]。目前马铃薯黑痣病的防治主要依靠农药的施用[3,4],但化学药剂的频繁使用会导致抗药性的产生、同时带来农药残留和环境污染等问题[5]。从棉花根际土壤分离得到的多粘类芽胞杆菌Sx3可产生杀镰孢菌素和多粘菌素P,有效抑制水稻白叶枯病菌的生长,菌株培养滤液抑制病原菌生物膜形成并破坏其细胞形态[6]。

Potato black scurf caused by the soil-borne pathogenic fungus Rhizoctonia solani is one of the main causes of potato continuous cropping obstacles. A biocontrol bacterium Paenibacillus polymyxa ZF129 had signi-ficant inhibitory effect on Rhizoctonia solani that the inhibition rate on mycelial growth was 55.29% and control efficacy in greenhouse was 84.76%. Meanwhile, ZF129 exhibited significant and broad inhibitory spectrum against six pathogenic bacteria and eight pathogenic fungi.