There are several pests and diseases that attack coffee trees. Some, like the coffee wilt are very dangerous that they can destroy an entire coffee shamba.
Others can be stopped through spraying and other management practices.
For the wilt, however, you need to keep constant watch over the shamba and eliminate any tree that shows signs of the coffee wilt.
The disease manifests through gradual drying of coffee trees. It has no treatment and so the remedy is to dig out the infected tree and then burn it up. If this is not done, then the shamba will be destroyed.
You can also mitigate the impact by planting varieties that are resistant to the wilt. Avoid sharing your farm tools with other farmers because that too facilitates the spread of diseases.