Bordeaux Mixture Preparation: Preventive Spray for black spot & other plant diseases
This is how to prepare Bordeaux mixture at the rate recommended for overwinter (dormant) spraying as a plant disease preventive. If you spray thoroughly on dormant plant, the spray will help to reduce overwintering spores (downy & powdery mildew of grapes, apple scab, etc on orchard crops). I'll use the formula today to reduce blackspot on my dormant roses.
Bordeaux mixture preparation:
For each gallon of water, separately dissolve 6.5 tsp of Copper (II) sulfate and 3 tbsp of Hydrated lime. Stir well, and let sit for 15 minutes. Strain the 2 resulting solutions together into your spray tank.
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