辣椒细菌性果实条斑病菌生物学特性及抑菌药剂筛选

研究辣椒细菌性果实条斑病菌的生物学特性,对病原菌进行室内药剂筛选,旨在为田间病害规律研究和病害防治提供依据。采用紫外分光光度计测定病原菌在不同温度、pH、NaCl浓度下的生长速率。采用滤纸片抑菌圈法对病原菌进行室内药剂筛选试验。结果表明,辣椒细菌性果实条斑病菌最适生长温度为28℃,最适pH 7.0,病原菌的耐盐性为12%。18种供试药剂在药剂推荐使用剂量范围内,四霉素、乙蒜素、77%志信、氯溴异氰尿酸4种药剂对病原菌有抑菌效果,对这4种药剂进行毒力测定,结果表明四霉素的毒力较强,EC₅₀值为11.75 mg/L,毒力强于其他3种试剂,四霉素可作为田间防治药剂的首选。

Biological Characteristics of Pseudomonas argentinensis Causing Fruit Streak Disease on Pepper and Screening of Bactericides

The biological characteristics of the bacterial fruit streak pathogens of pepper were studied and the pathogens were screened for indoor agents with the aim of providing a basis for research on disease patterns and disease control in field. The growth rate of the pathogenic bacteria at different temperature, pH and NaCl concentrations were determined by UV spectrophotometer assay. The indoor pharmaceutical screening test for the pathogenic bacteria was conducted using the filter paper sheet inhibition circle method. The results showed that the optimum growth temperature for the bacterial fruit spot of pepper was 28℃, the optimum pH was 7.0 and the salt tolerance of the pathogen was 12%. 18 test agents were used in the recommended dosage range, and four agents, namely tetramycin, ethyl alliin, 77% Shishin and chlorobromoisocyanuric acid, were effective against the pathogen. The EC₅₀ value of tetramycin was 11.75 mg/L, which was stronger than the other three agents, so tetramycin could be used as the first choice of field control agents.