天津地区草坪草褐斑病菌生物学特性及生物防治

Study of biological characteristics and biocontrol of the brown patch of turfgrass in Tianjin

以纯化的草坪褐斑病病原RH2 Rhizoctonia solani为试验菌株．对其生长的温度、pH值、碳源等生物学特性进行研究．并针对目前化学药剂频繁使用的现状．对生产上经常使用的生防药剂进行室内筛选。生物学特性研究表明：褐斑病菌生长适宜温度约30℃。适宜pH值6．5～7．5．适宜碳源为蔗糖、可溶性淀粉或乳糖。室内7种生防药剂筛选表明：尼索和特立克的抑菌效果最好，盆栽防治试验结果表明，尼索1500倍处理防效为72．51％，特立克600倍防效为76．94％。

The purified strain RH2 （Rhizoctonia solani） separated from the turfgrass was used to test the features including the suitable temperature, pH and carbon source in Tianjin. In order to resolve the problem caused by the chemical pesticide usage, 7 biocontrol preparations were used to screen the suitable ones. The result showed that suitable culture temperature was 30 ℃ and suitable pH was 6.5 to 7.5, suitable carbon source was sugar, soluble starch or lactose. Nisuo and Telike were the best biocontrol preparations through laboratory screening. The results of pot experiment showed that the control efficiency of Nisuo and Telike were 72.51% and 76.94% when the concentration was 1 500 times and 600 times respectively.