Rose Milldew

Zone Santa Ana, california 92705 | johnstanco added on July 3, 2017 | Answered

I have 12 Rose bushes in beds in front of my office in So. Cal all have mildew and have sprayed several ties but its completely covering all of them . They are still blooming and growing but they look terrible.. have had them all for 5 years or more. Should I just clean out the beds and begin again with new roses ? New soil or ?

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Certified GKH Gardening Expert
Answered on July 9, 2017

The best Mildew Problems item I have found is called Green Cure. You can purchase it on-line at Planet Natural or at Mix the white powder product with water at the Cure Rate listed on the label, (two of the scoops in with the product to a gallon of water) and spray it liberally on the rosebushes totally wetting all foliage. Spray the roses again every 5 to 7 days for at least 4 sprayings. Then Spray the rosebushes again every two to three weeks, at the Cure Rate, to keep the mildew under control. Prune up the rosebushes a bit to allow better airflow through and around the rosebushes. The air circulation will help keep the mildew creating conditions at bay.

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