甘蔗赤腐病菌对碳、氮源的利用及其室内毒力测定

Carbon and Nitrogen Utilization and Toxic Test of Sugarcane Red Rot

选择来自海南岛不同蔗区的4个甘蔗赤腐病菌的有效单孢菌株用于毒力测定,并对其代表菌株的碳、氮利用特性进行了研究。结果表明,综合赤腐病菌生长速度及其长势2个指标而言,其最适碳源是D-木糖,氮源则是硝酸钠。此外,毒力测定结果表明,6种常用药剂对4株赤腐病菌的生长有不同程度的影响。其中,多菌灵、正品甲津托、福美双和丙环唑对甘蔗赤腐病菌毒力较强,相比之下,百菌清和代森锰锌两种药剂效果较差。

Red rot disease caused by the fungus Colletotrichum falcatum Went is the major production constraint for sugarcane production in the world. In this study, isolates collected from Hainan provinces were identified on the morphological characteristics, 1 single spore isolates carbon and nitrogen nutrient utilization and 4 single spore isolates toxicity of sugarcane red rot were studied. The main results indicated that： xylose was the best of carbon sources, while NaNO3 was the best of nitrogen sources. Moreover, the results from 6 tested fungicides to toxicity of the pathogens showed that Carbendazim, Meroif, Thiram, Propiconazole were more effective, and both Chlorothalonil and Mancozeb were a little effective in the treatment.