Which of the following is a prevention method for angular leaf spot?

Avoiding overhead watering systems is a critical method for preventing angular leaf spot because this disease is often promoted by excess moisture on the foliage. Overhead watering can lead to water accumulation on leaves, which provides a conducive environment for the pathogen responsible for angular leaf spot to thrive. Keeping the leaves dry helps to minimize the likelihood of infection, effectively disrupting the disease cycle.

Fertilizers, while beneficial for plant health, do not directly prevent angular leaf spot. They might improve overall vigor and resistance, but they do not address the moisture and environmental conditions that facilitate disease development.

Regular use of insecticides may help control pests that can stress plants, but it does not specifically target the environmental factors associated with angular leaf spot.

Planting in shaded areas might influence the humidity and moisture levels around plants, but it does not necessarily guarantee prevention of angular leaf spot, as there are other critical factors such as air circulation and water management that play a more significant role.

Overall, avoiding overhead watering systems is a proactive approach that focuses on reducing leaf wetness, which is essential in managing the risk of angular leaf spot infection.