5种药剂对2株立枯丝核菌的室内毒力测定

Toxicity Test of Five Fungicides against Two Strain Rhizoctnia solani Khn

采用生长速率法,在室内测定了w=25%丙环唑、w=12.5%戊唑醇、w=80%乙蒜素、w=25%咪鲜胺和w=5%井冈霉素5种杀菌剂对R-HKB和R-DZC两株立枯丝核菌(Rhizoctonia solani)的毒力。结果表明:丙环唑对R-HKB的毒力和戊唑醇对R-DZC的毒力均最大,其EC50值分别为0.0132mg·L-1和0.4131mg·L-1;井冈霉素对R-HKB和R-DZC的毒力均最小,其EC50值分别为714.4948mg·L-1和663.4171mg·L-1。其毒力倍数分别比丙环唑和戊唑醇小(54128.4倍和1606.0倍)。提示:丙环唑和戊唑醇对R-HKB和R-DZC两株立枯丝核菌有很好的抑制效果。

The mycelium growth rate method was used to measure and compare the toxicities of 5 fungicides against R-HKB and R-DZC, of Rhizoctnia solani Ktihn, which were 25% propiconazole, 12.5% tebuconazole, 80% ethylicin,25% prochloraz and 5% Jinggangmycin, The results showed that propiconazole was the most effective on inhibiting the radial growth of strain R-HKB mycelium, and its EC50 was 0.013 2mg · L^-1; tebuconazole was the most effective on inhibiting the radial growth of R-DZC mycelium, and its EC50 was 0. 413 1 mg ·L^-1 ; The toxicity of Jinggangmycin was the lowest against the growth of R-HKB and R-DZC mycelium, whose EC50 were 714. 494 8mg ·L^-1 and 663. 417 1 mg ·L^-1 respectively. The toxicity of Jinggangmycin was 54 128. 4 and 1 606.0 times less than that of propiconazole and tebuconazole separately. These data indicated that propiconazole and tebuconazole were more effective for the growth inhibition of R. solani in Aquilaria sinensis and Zoysiagrass sinica.