Abstract
Tomato yellow leaf curl virus (TYLCV) was diagnosed in tomato plants in insect vectors by use of a virus-specific probe. By molecular hybridization with radiolabeled TYLCV DNA, we detected viral nucleic acids in lysates prepared from infected tomato plant tissues such as leaves, roots, stems, shoot apex, and cotyledons and showed that the virus is not evenly distributed throughout the plant. The TYLCV probe also detected the virus in lysates of individual whitefly (Bemisia tabaci) vectors. The TYLCV-specific DNA probe can serve as a powerful tool in monitoring the tomato yellow leaf curl disease.

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