Use This If You Have Ever Had A Disease Problem In Your Garden Or Trees. I love this stuff! I hooked it to my garden hose and sprayed my flowering crabapple tree (always gets ugly apple scab) last year right after blossom drop. I sprayed my Bee Balm (always gets powdery mildew). I went through the summer with a fraction of the disease I normally live with. I am going to spray again this year in the next week or so. Liquid Systemic Fungicide is rainproof once it is dry. Prevents and treats rust, powdery mildew, blight, leaf spot, scab, brown patch, dollar spot, snow mold, anthracnose and more. May be used on lawns, flowering ornamentals, trees including many fruit and nut trees, and corn.