Can you use copper sulphate to control bacterial blight in the leaves of lemon tree and what would be the application rate?

Yes, copper sulfate can be used to control bacterial blight in lemon tree leaves. It acts as a fungicide and bactericide, helping to reduce the spread of the disease. The typical application rate is around 1-2 pounds per 100 gallons of water, but it's essential to follow specific product instructions and local regulations for optimal results and to avoid phytotoxicity. Always ensure proper application timing and methods to maximize effectiveness while minimizing harm to the plant.