ASK ED MARIJUANA GROW TIP #43: DEALING WITH POWDERY MILDEW
POWDERY MILDEW: As you can see from the first photograph below, my plants were suffering from powdery mildew. I sprayed the plants with a solution of Ed Rosenthal’s Zero Tolerance Fungicide diluted slightly with 1 quart of water to a gallon of the fungicide, and added an ounce of Serenade® concentrate to the mix. I used a hand compression sprayer with a long flexible wand, so that the spray could reach all areas infested. The powdery mildew was on the top of the leaves, so I did not need to spray underneath. The result 24 hours later—no sign of powdery mildew remains on the plant. I blended Ed Rosenthal’s Zero Tolerance Fungicide and Serenade because they work synergistically to combat powdery mildew and prevent its recurrence.