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Bordeaux mixture is a common solution used to control fungi on apple plants. It is composed of copper sulfate and lime, and it can effectively reduce the impact of different fungal diseases such as apple scab, powdery mildew, and cedar apple rust.
However, it’s imperative to use the right Bordeaux mixture ratios when treating apple plants. The ideal ratio can vary depending on the age of the apple plant, the stage of growth, and the type of fungus you’re trying to control.
Here are some general guidelines to follow when using Bordeaux mixture for apple plants:
1. Preparation:
Before applying, mix a small quantity of copper sulfate into a bucket of water to dissolve the sulphate. Mix lime to the same bucket of water into a separate container. Use a strainer to remove any impurities from the mixture, and then pour the two solutions together.
2. Mixing ratios:
For young trees, the recommended ratio is 2 pounds of copper sulfate for 3 gallons of water, and 3 pounds of hydrated lime for 3 gallons of water. For established trees, the ratio is 4 pounds of copper sulfate for 3 gallons of water, and 5 pounds of hydrated lime for 3 gallons of water.
3. Application frequency:
You should apply Bordeaux mixture when apple trees are dormant. Apply before bud breaking in the spring and once a month after that.
Note: It’s essential to ensure that the mixture doesn’t come into contact with the fruits and any exposed parts of the apple plant.
In conclusion, Bordeaux mixture can be an effective solution for controlling fungi on apple plants. But, it’s crucial to use the appropriate Bordeaux mixture ratios according to the age of the apple plant, the stage of growth, and the type of fungus you’re trying to control. Always remember, proper application techniques can save your apple plant, ensure its longevity, and help a homeowner reap abundant harvest.