Copper gluconate is a form of copper chelated with gluconic acid, an organic acid derived from glucose. This combination forms a copper complex that is more soluble and bioavailable than other forms of copper, making it more readily absorbed by plants.

In agriculture, copper gluconate is often used as a fungicide or bactericide. Its antifungal properties make it a popular choice for combating various plant diseases, such as rust, mildew and other fungal infections. It can also be used to treat the bacteria responsible for certain plant diseases.

Copper is an essential trace element for plant growth, but it's important to apply it in a controlled manner, as excess copper can be toxic to plants. Copper gluconate offers a safer option due to its better bioavailability and increased solubility compared to other forms of copper.

In summary, copper gluconate is used in agriculture as a means of supplying copper to plants, particularly to combat fungal and bacterial infections. However, it is always advisable to follow specific recommendations for use and recommended doses to avoid any risk of toxicity.