Viruses even solicit rides from humans. Tobacco mosaic virus infects a wide variety of plants, and can be carried on smokers' fingers. Plant choice can help avoid virus problems. Some varieties are virus-resistant. Don't blame all your plant problems on viruses.
Definitive diagnosis is often difficult without a laboratory test.
Perhaps you're just overwatering. This article first appeared January 13, 2001. We welcome your feedback. All rights reserved.