辣椒疫霉菌侵染模型和侵染条件定量研究

在生长箱内控制条件下分析测定了土壤温度、水分含量对辣椒疫病死苗率的影响.结果表明:土壤温度和水分状况是决定辣椒疫病菌侵染的重要因子，病菌侵染的最适土壤温度为22 ℃～28 ℃，最适土壤含水量为40%，土壤过于干燥和过饱和都不利于病菌侵染发病;辣椒疫病死苗率与土壤温度、水分含量及其互作可用数学模式描述.田间调查发现，辣椒疫病田间流行趋势可用Gompertz模型描述，发病率与初始发病率、土壤温度、水分含量以及空气温度密切相关.建立了田间辣椒疫病发病率预测模型.

Infection of Phytophthora capsici on pepper: Models and affecting factors.

Under controlled conditions in growth chamber, this paper studied the mortality of pepper seedlings caused by Phytophthora capsici. The results showed that soil temperature and water content were the important factors affecting the infection of P. capsici, and their optimum values for the infection were 22-28 TC and 40%, respectively. The relationships of the mortality of pepper seedlings caused by Phytophthora capsici with soil temperature, water content and their interactions could be described by mathematical models. Field observation suggested that Gompertz model was the best one for describing the epidemic dynamics of the disease, and the incidence of P. capsici was significantly related to the initial incidence of P. capsici, soil temperature, soil water content, and air temperature. The forecast model of P. capsici incidence on field pepper was established.