Which method is NOT an effective management practice for tomato black mold?

Overhead irrigation is not considered an effective management practice for controlling tomato black mold. This disease, often associated with high humidity and excessive moisture on the foliage, can thrive in conditions where water is splashed onto the leaves. Overhead irrigation increases humidity and can create a conducive environment for fungal diseases, including black mold, as moisture remains on the plant surfaces for extended periods.

In contrast, practices such as using fungicides can help reduce the incidence of fungal pathogens, while delaying harvest can be beneficial in minimizing damage if conditions become unfavorable for disease development. Avoiding overhead watering is effective as it helps to keep the foliage dry, reducing the risk of black mold establishing and spreading. Therefore, overhead irrigation is counterproductive in managing this particular plant pathogen.