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为明确硫酸链霉素对番茄斑疹病病菌的毒力及对病害的防效,采用平板菌落计数法测定其毒力,并对温室内番茄植株进行人工接菌后喷施药剂,测定其防效。结果表明,硫酸链霉素对番茄斑疹病病菌的毒力(EC_50)为0.060 8μg/m L;温室防治试验中,72%硫酸链霉素可溶性粉剂3 500~6 000倍液处理对发病植株的病指防效为95.24%~77.78%,除最低用量6 000倍液处理外,均极显著高于对照药剂46.1%氢氧化铜水分散粒剂1 250倍液处理。从沈阳地区保护地发病番茄上采集的供试斑疹病病菌对硫酸链霉素高度敏感,未产生抗药性。
In order to clarify the virulence of streptomycin sulfate against tomato disease and its control effect on the disease, the colony counting method was used to determine its virulence. The tomato plants in the greenhouse were inoculated with the agents and then tested for their toxicity effect. The results showed that streptomycin sulfate had an EC50 of 0.060 8μg / mL against tomato disease, and 72% of streptomycin sulfate soluble 3,500-6,000 times in the control of greenhouse, Of the disease means that the control efficacy is 95.24% ~ 77.78%, except for the minimum dosage of 6,000 times the liquid treatment, were significantly higher than the control agent 46.1% copper hydroxide water dispersible granules 1 250 times liquid treatment. The test pathogens collected from tomato in the protected area of Shenyang area were highly sensitive to streptomycin sulfate and did not produce drug resistance.