Bacterial Leaf Scorch
This disease is caused by the
Symptoms often start out as a marginal chlorosis or yellowing of the leaves
before they fade to a drab green or brown color. Presumably the symptoms
develop because of water stress within the water conducting vessels. Diseased
trees lose vigor, and branches or entire trees may eventually die. The symptoms
are most noticeable in late summer to early fall, following extended periods of
drought. The bacteria are transmitted by leafhoppers and vegetatively through
grafts and cuttings.
In general, practices that encourage root development and
root function are recommended. Incorporate organic soil amendments into the
soil to improve aeration and drainage of clay soils or to improve the water
holding capacity of sandy soils. Irrigate during periods of drought. The
disease has been suppressed by oxytetracycline injections.
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