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Apple Leaf Drop
(Necrotic Leaf Blotch, Golden Leaf Drop)
Apple leaf drop, also known as Golden leaf drop and necrotic leaf blotch, is a
physiological disorder common in Golden Delicious. It has also been noted on
Jonagold, Gala and Gala/Splendour crosses. Leaf drop is not normally a serious
problem. It is some-times mistaken for a disease or nutrient deficiency,
resulting in unnecessary spray applications.
Symptoms:
Symptoms may develop as early as June. Leaf drop or blotch appears as irregular
brown blotches on mature leaves, often along the midvein. Blotches develop
rapidly, usually within 24 hours. Leaf yellowing and defoliation may follow
within 4 to 7 days. Older trees are more likely to be affected than young,
vigorous trees.
Cause:
Apple leaf drop usually develops when a cool, rainy period of 4 to 5 days is
followed by hot, sunny weather. It is thought to be related to temperature,
light intensity and soil moisture effects on plant hormones.
Control:
Control is not necessary as reductions in quality and yield have not been
observed.
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