Apple mosaic
Leaves with apple mosaic turn pale yellow or white along the veins and develop large yellow spots that
later turn brown. Leaves fall prematurely. Small yellow spots develop on the leaves of less sensitive
varieties or varieties infected with mild strains of the virus. Tree growth and yield is reduced.
Solutions
All varieties of apple are susceptible to apple mosaic but
some, such as 'Jonathan', 'Golden Delicious', and 'Granny
Smith', exhibit more conspicuous symptoms. Besides varietal
difference, mosaic symptoms vary with the strain of the
virus and are more pronounced in a cool spring. Apple mosaic
is transmitted by budding, grafting, and root grafts of
healthy trees with infected trees. Its occurrence can be
minimized by using virus-free propagation sources. You cannot
eliminate the virus without removing the tree. Fruit yields
may be reduced 25 to 50%.
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Leaf
symptoms of apple mosaic
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