Under which environmental condition does angular leaf spot occur?

Angular leaf spot is primarily associated with wet weather conditions, particularly humidity and standing water. The disease typically occurs when the weather is cool and moist, allowing the pathogen responsible for the disease, often species of Pseudomonas, to thrive.

The key environmental condition contributing to the occurrence of angular leaf spot is standing water, which fosters a suitable environment for bacterial growth and infection. Pools of water can facilitate bacterial spread through splash, leading to more significant disease outbreaks in susceptible plants. This condition is particularly problematic for crops that are sensitive to such pathogens.

While dry climates or strong winds may inhibit the spread of the disease, and cold weather can affect plant health, the vital factor remains the presence of moisture or standing water, making it the most conducive condition for the development of angular leaf spot.