Q: What product can I use to stop fungus or nematodes.
Diseases are usually plant specific, so there is no one chemical kills all. Take a sample of the infected plant to your local independent garden center for an Id and recommendation as to what to use. Here's a website/ article that will give you more information about nematodes and how to deal with them: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7489.html. You can search Google for more information. Best And Happy Yardening, Nancy