It sounds like your tomato plant might have powdery mildew, which shows up as yellow patches on leaves, but also a bit of the characteristic powdery white growth. This interferes with the vigor of the plant and fruit size, but should not kill it, unless severe (it will kill individual leaves). To avoid, water the plant only on the bottom, as wet leaves tend to encourage the disease. Also, provide good air circulation and sunlight. To treat, consult a local garden nursery for various products, organic and inorganic depending on your preference. A common preventative involves formulas containing sulfur; horticultural oil is a common treatment if the disease is already there. Also, remove affected leaves (only remove up to a third of the leaves on the plant, though). Clean tools before and after pruning.
Free Email Newsletters
Almanac Weekly Companion:Editors handpick timely topics: weather, gardening, the Moon, folklore, and more.
The Almanac.com General Store: Great savings, exclusive offers!
Almanac Recipe Box: Our best recipes delivered twice a month.
Great Almanac Giveaway: A monthly chance to WIN a fabulous prize.
Check out this month's prize: from Almanac.com
Enter to win!
Visit the Almanac Live!
See where we live.
Look through the Almanac webcams.
Visit our sister Web site: www.YankeeMagazine.com
Custom programming and server maintenance by Reinvented Inc.
©2014, Yankee Publishing, Inc., P.O. Box 520, Dublin, NH 03444, (603) 563-81112014-08-21 21:38:59