- Byphan 800WP has a broad-spectrum fungicide effect, kills fungi through direct contact, prevents many types of fungal diseases on many types of plants such as: Leaf spot, anthracnose, fruit rot on fruit trees: Oranges, persimmons, grapes, apples... Preventing leaf spot disease, dry leaf tips on peanuts, sesame... Preventing late blight and downy mildew on cucumbers, watermelons and potatoes...