We have already discussed one of the best known plant diseases called tobacco mosaic virus. Plant viruses can stunt any plant growth and diminish crop yields. There are two major routes by which a plant viral disease can spread either by Horizontal Transmission or Vertical Transmission. In the first, a plant is infected from an external source of virus through injured parts or through insects. In the second, a plant inherits a viral infection from a parent. Agriculturists have not yet devised cure for most viral diseases of plants. Therefore, their efforts have focused largely on reducing the incidence and transmission of such diseases and on breeding genetic varieties of crop plants that are relatively resistant to certain viruses.
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