Shade effects on coffee diseases are ambiguous because they vary depending on the season and environment. Using Coffee Leaf Rust (CLR) as an example, we demonstrate relationships between the environment and shading systems and their effects on disease intensity. We characterized seasonal variations in microclimate and CLR incidence across different altitudes and shading systems, and integrated effects between the environment, shading systems, microclimate and CLR into a piecewise structural equation model. The diurnal temperature range was higher in unshaded systems, but differences decreased with altitude. Humidity related indicators in shaded systems decreased with altitude. At mid and high altitudes, high CLR incidence occurred in the shading system showing a low diurnal temperature range and a high dew point temperature. Our study demonstrates how microclimatic indicators vary as a function of the season, altitude and the coffee shading system, and how this in turn is related to CLR.

由于咖啡因季节和环境而异，因此对咖啡疾病的阴影影响尚不明确。以咖啡叶锈病（CLR）为例，我们演示了环境与遮光系统之间的关系以及它们对疾病强度的影响。我们描述了不同高度和遮阳系统在小气候和CLR发生率方面的季节性变化，并将环境，遮阳系统，小气候和CLR之间的影响综合到一个分段结构方程模型中。在没有阴影的系统中，昼夜温度范围较高，但差异随海拔高度而减小。遮阴系统中与湿度相关的指标随高度降低。在中高海拔地区，遮阳系统发生的CLR发生率较高，显示出较低的昼夜温度范围和较高的露点温度。