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Juli from Santa Monica, Ca writes

Would Agrisel BioPhos Pro Systemic Fungicide work as a drench on a Palo Verde tree with severe powdery mildew?

I'm looking for a systemic drench solution because multiple Neem Oil sprays have had no effect. The entire (young) tree (about 5 feet tall) has severe powdery mildew.


Agrisel BioPhos Pro Systemic Fungicide is labeled to treat for powdery mildew, however it must be applied as a foliar spray. Drench treatments will be effective only for certain soil-borne diseases but not for foliar diseases like powdery mildew.

Answer last updated on: 04/22/2021

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