Black rot is a fungal disease that can affect different fruit plants such as grape vines and apple trees. The leaves of the fruit may start to develop small spots of discolouration that then spread to the bark of a tree, blossoms and young fruit. It is impossible to get rid of black rot that has already taken over a plant, but you can take measures to prevent it from reappearing in the next growing season.
Rake up all the dead leaves, twigs and fruit that has fallen from the infected plants. Piles of dead plant parts may still carry infectious spores even though they are no longer connected to the tree. These spores may contaminate the new plant.
Use pruning shears to remove any infected leaves or fruit. You will also have to remove any part of the bark that is infected or any cankers or growths on the tree or vine that may be have black rot.
Pile up all the foliage that you have raked up and all the pieces that you have pruned from the plant and burn them. You may need to contact your local fire brigade and get a burn permit, especially if you have many neighbours. Burning the cuttings will ensure that you have removed all the infection from the area and that it will not recontaminate your new fruit plants.
Apply a fungicide to the trees. You can usually find these at your local gardening or hardware store. Specific instructions will be printed on the packaging. This will kill any remaining black rot and keep it from coming back again. Wear proper protection when applying it, such as gardening gloves and a mask.
If you are not confident with applying fungicide by yourself, hire a professional to do the job. He will know exactly what kind to use, how much to use and how to apply it properly.