What Is FMV (Fig Mosaic Virus)?
It is generally understood in the fig community that FMV is pervasive, that some varieties are resistant, and that mature, healthy trees show little to no signs of FMV, though the virus is present.
Fig mosaic virus can cause symptoms on both leaves and figs. On leaves, mosaic spots are distinctly yellow, contrasting with the normal green color of the foliage. The margins of the yellow spots blend gradually from a light yellow color into the dark green of healthy tissue. Mosaic spots or lesions may be uniformly scattered over the surface of the leaves or may appear as irregular patches of light green diffused widely throughout the leaf blade. Later in the season, a rust-colored band develops along the border of the mosaic spots, apparently caused by the death of epidermal or sub-epidermal cells.
Deformed leaves may occur on the same twig as normal leaves. Mosaic spots on figs are very similar to those on leaves, but less conspicuous. Premature fruit drop may also occur in certain varieties.
Ficus palmata, or trees derived from seedlings having F. palmata as the male parent, appear to be immune to mosaic.
