Good for fungus diseases on grapes, fruits such as peaches, apples. Used against Potato blight. Helps roses with fungus. Calcium Calcium is a natural fungicide. Applied either directly on the leaf or into the soil.
Calcium reduces certain types of bad bacteria, fungi found in many diseases.
Also beneficial bacteria enjoy the calcium in their diet. So a good spray will naturally be a mixture of calcium and a bacterial source. Calcium can be obtained from crushed egg shells. Bone meal is also a good source of calcium. Copper Copper is an excellent natural fungicide, controls diseases of vine crops, potatoes, leaf spot, anthracnose, downy mildew, powdery mildew, scab, fire blight, bacterial spot.