The answer to 'patio disease' is that there are several common causes of patio problems, including mold, mildew, moss, and algae growth. Symptoms may include discoloration, slippery surfaces, and cracking or crumbling of the patio material. The best solution depends on the specific issue, but typically involves cleaning, treating, and potentially repairing or resurfacing the patio.
For minor issues, homeowners can often address patio disease through DIY cleaning and treatment methods. However, for more severe or persistent problems, it's best to call in a professional landscaping technician who can properly diagnose the issue and recommend the most effective solution.