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Rust - rusty looking spots, plant turns yellow Treat with fungicidal spray.
Dropsy - mostly a problem with indoor plants that show lesions Donít water plant so much and put it in sunniest spot you can find.
3. Look for pests such as caterpillars, flys, mites,termites and slugs are garden pests that might like to make a meal of your geraniums. You can control most of these pests with special sprays that you can get at your garden supply store. Aphids are another problem that may be controlled with ladybugs. Slugs can be captured simply by putting out a saucer of beer.
4. Make sure you fertilize properly. Geraniums like a soil that has plenty of nitrogen and lack of it can cause plant to turn yellow. If you suspect this could be problem, then you might try fertilizing with a fertilizer that has a high concentration of nitrogen.
Lee Dobbins writes for http://www.geranium-flowers.com where you can find out more about geraniums. Visit http://www.geranium-flowers.com/Geranium-Pests-and-Diseases.html for more on geranium pests and diseases.