Ascochyta blight epidemics have been observed in many countries since the early 1900s but studies on an interaction between the amount of inoculum, environmental factors and the spatiotemporal development of Ascochyta blight are rare due to the historic emphasis on developing resistant cultivars and chemical control of the disease. I used generalised linear mixed models to investigate key environmental factors affecting the spatiotemporal development of Ascochyta blight from primary infection foci. Briefly, four replicate plots (20 m × 20 m) of a susceptible chickpea cultivar were planted at two different locations (Billa Billa and Tosari) in Queensland, Australia. Four naturally infested stubble pieces were placed at the centre of each newly emerged chickpea plot 14 days after sowing. The number of infected plants was counted in 1 m² observation quadrats at the distances of 3, 6 and 9 m in a concentric arrangement. The number of infected plants increased with each assessment date, approaching 100% plant infections at the time of final assessment. The rate of disease progress was significantly faster at Tosari. The rate of disease progress significantly decreased as the distance from the primary infection foci increased. There was a significant positive effect of an optimum temperature, increasing rainfall and omni-directional wind. The influence of wind speed was not significant. The finding that single infection foci were enough to spread disease across whole plots indicate that limited inoculum is not a barrier in the development of an epiphytotic under conducive conditions.

自 1900 年代初以来，许多国家已经观察到子囊枯病流行，但由于历史上强调开发抗性品种和对该病的化学控制，对接种量、环境因素和子囊枯病时空发展之间相互作用的研究很少. 我使用广义线性混合模型来研究影响来自初级感染病灶的 Ascochyta 枯萎病时空发展的关键环境因素。简而言之，在澳大利亚昆士兰的两个不同地点（Billa Billa 和 Tosari）种植了易感鹰嘴豆品种的四个重复样地（20 m × 20 m）。播种后 14 天，在每个新出土的鹰嘴豆地块中央放置四块自然侵染的残茬。以 1 m 为单位计算感染植株数^{2 个}观测样方，距离为 3、6 和 9 m，同心排列。受感染植物的数量随着每个评估日期而增加，在最终评估时接近 100% 的植物感染。Tosari 的疾病进展速度明显更快。随着与原发感染病灶的距离增加，疾病进展速度显着降低。最适温度、增加降雨量和全方位风的积极影响显着。风速的影响不显着。单个感染病灶足以在整个地块上传播疾病的发现表明，在有利条件下，有限的接种不是附生植物发育的障碍。