In other words, don't plant tomatoes in the same spot. And after each harvest, sterilize your cleared vegetable patch by covering it with a plastic sheet and allowing the sun to do its work. Peterson said you still can use the tomatoes by simply discarding the infected part. One of Arizona's more interesting national parks is Saguaro National Park in Tucson. In addition to scenic drives, the park has more than 150 miles of hiking trails.
Powdery mildew is a fungus that leaves a white substance on rose leaves.
You can spray ready-mixed fungicides available at nurseries or garden centers. Put in a spray bottle and use. The mixture will help prevent the spread of powdery mildew. To prevent it in the first place, the trick is to start spraying early in the season and on a weekly basis, according to the Web site. Please include full name and city.