Can Bordeaux Be Used on a Growing Tomato Plant?

Tomatoes are a popular choice for gardeners, and for good reason. Not only do they have a delicious flavor, but tomatoes are also packed with healthy nutrients. However, growing tomatoes can be a tricky task, as tomato plants are prone to a range of diseases and pests. One of the most common diseases is fungal infections, and many gardeners turn to Bordeaux mixture to help combat this problem.

What is Bordeaux Mixture?

Bordeaux mixture is a formula made of copper sulfate and lime. It was first used in the Bordeaux region of France to treat grape vines that were being attacked by a fungal disease known as downy mildew. Today, it is commonly used as a fungicide and bactericide in agriculture and gardening.

Using Bordeaux Mixture on Tomatoes

Bordeaux mixture can be effective in controlling fungal diseases on tomato plants. The copper sulfate in the mixture works by preventing fungal spores from germinating, while the lime helps to neutralize the acidity of the copper sulfate and improve the mixture's adherence to the plant surfaces.

However, it's important to note that Bordeaux mixture should be used as a preventive measure, rather than a cure. Once a plant is heavily infected with a fungal disease, it may be too late to save it with Bordeaux mixture. Therefore, it's best to apply the mixture early in the season, before any signs of disease appear.

How to Apply Bordeaux Mixture to Tomato Plants

To apply Bordeaux mixture to your tomato plants, follow these steps:

Put on protective clothing, including gloves, a face mask, and goggles.

Mix the copper sulfate and lime according to the manufacturer's instructions.

Apply the mixture using a sprayer, making sure to coat the leaves and stems of the tomato plant.

Repeat the application every 7-14 days, or as needed.

It's important to note that Bordeaux mixture can be harmful to beneficial insects, such as bees, so it's best to apply the mixture in the evening, when these insects are less active.

Conclusion

In summary, Bordeaux mixture can be an effective tool in preventing fungal diseases on tomato plants. However, it should be used as a preventive measure and applied early in the season. As with any pesticide or fungicide, it's important to follow the manufacturer's instructions and take precautions to protect yourself and the environment.