Trichoderma harzianum is a beneficial fungus used as an organic biofungicide for soil and plants. Its powder can be applied to foliage, seeds, and soil to suppress various fungal diseases, including powdery mildew, leaf mold, leaf spot, downy mildew, gray mold, root rot, anthracnose, wilt, yellow wilt, and brown spot. It is effective within 3-7 days, helps prevent and treat fungal and bacterial diseases, and promotes crop growth and immunity.