If your yard has a diseased tree or bush that you need to prune or remove completely, be sure to properly disinfect your gardening tools after you've done the task. Dirty blades on pruners can transfer the disease to perfectly healthy plants in your yard. But the good news is that cleaning your gardening tools is pretty simple: Just use warm water and a teaspoon of bleach. Or at the very least, hot, soapy water will do the job. Just rinse and wipe off with a towel to kill the germs on the blades.