What type of diseases does Trichoderma harzianum control?

Trichoderma harzianum is a well-recognized biocontrol agent known for its effectiveness in managing a range of soil-borne pathogenic fungi, particularly those that cause damping-off diseases. These are typically caused by pathogens that thrive in the soil and affect seedlings, leading to significant losses in early development stages.

The timing of pathogen activity is crucial; damping-off often occurs in early to mid-seasons when conditions are favorable for pathogens in the soil and for seedling growth. Trichoderma harzianum acts through various mechanisms, including competition for nutrients and space, the secretion of antifungal compounds, and by inducing resistance in plants.

This characteristic makes it especially beneficial for controlling mid-to-late season damping off diseases, helping seedlings establish before they progress to later growth stages, which is critical for overall plant health and crop yield. Other types of diseases mentioned do not align as closely with the specific action and targets of Trichoderma harzianum in the soil environment.