北京地区早熟禾褐斑病菌生物学特性及防治研究

Studies on the Biological Characteristics of Rhizoctonia solani on Poa pratensis and the Control of Brown Patch

对北京地区早熟禾褐斑病分离到的立枯丝核菌（Rhizoctonia solani Kuhn）进行了7个温度（12，16，20，24，28，32，36％）、两种光照条件（全黑暗和12h光暗交替）下的菌丝生长速率测定、菌核产生量比较，温度对发病的影响，10种杀菌剂的抑菌试验和几种杀菌剂的Kt间药效试验。菌丝生长的适宜温度范围为24-32℃；12h光／暗交替条件下。菌丝生长速率加快；32℃下菌核产生量显著多于其他温度；20-30℃下早熟禾发病严重。多菌灵、扑海因、坪安1号和多氧霉素等杀菌剂的抑菌效果好。田间药效试验表明，扑海因、井岗霉素、坪安1号和多菌灵对褐斑病有良好的防治作用。

The experiments were conducted in the growth responses of Rhizoctonia solani isolated from Kentucky bluegrass in Beijing region at seven temperatures （12,16,20,24,28,32,36℃）, two illumination conditions（whole dark and 12 h light/dark cycles）, and the inhibition activity of 10 fungicides on pathogens in laboratory. The field trails of 4 fungicides control on Kentucky bluegrass brown patch were carried out. Optimal temperature for mycelial growth was 24, 28 and 32%. Mycelial growth was quicker under 12 h light/dark cycles than under whole dark. Conidia was at mass production 32℃. The disease indices were the highest at 20,25,30 ℃. Rhizoctonia solani was sensitive to carbendazim, iprodione, pingan-1 and polyoxin in laboratory test. In field trials, iprodione, jinggangmycin, pingan - 1 and carbendazim significantly suppressed the disease.