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由镰孢炭疽菌(Colletotrichum falcatum Went.)引起的甘蔗赤腐病是甘蔗上最具毁灭性的病害之一,在病害流行季节能导致严重的产量损失。为了解甘蔗赤腐病原对杀菌剂的敏感性,本研究测定了11种杀菌剂对该病原菌的毒力。结果表明,11种杀菌剂对甘蔗赤腐病菌的毒力存在明显差异。其中,戊唑醇、丙环唑、咪酰胺、苯醚甲环唑、多菌灵等5种药剂对甘蔗赤腐病菌菌丝体生长具有较好的抑制作用,EC50值介于0.227~0.818μg/m L。其对应EC95值也都小于12μg/m L,介于1.416~11.339μg/m L。就敏感性而言,4株赤腐病菌菌株对多菌灵的b值在11种杀菌剂中均为最大。由此表明,甘蔗赤腐病菌对多菌灵的剂量反应变化比其它几种杀菌剂均要敏感。
Sugarcane red blight caused by Colletotrichum falcatum Went. Is one of the most devastating diseases on sugarcane and can cause severe yield loss during the season of disease. In order to understand the sensitivity of sugarcane red rot pathogen to fungicides, this study determined the toxicity of 11 fungicides to this pathogen. The results showed that 11 kinds of fungicides on the toxicity of sugarcane Toxins obvious differences. Among them, tebuconazole, propiconazole, prochloraz, difenoconazole, carbendazim and other five kinds of agents have a good inhibitory effect on the growth of mycelia of C. pyogenes, EC50 values ranged from 0.227 ~ 0.818μg / m L. The corresponding EC95 values were also less than 12μg / m L, ranging from 1.416 to 11.339μg / m L. In terms of sensitivity, the b value of carbendazim for the four strains of Chlamydomonas is the largest among the 11 fungicides. Thus, it is indicated that the dose response of T. gmelinii to carbendazim is more sensitive than several other fungicides.