Leaf spot

problems Guide

Signs of the problem

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Symptoms appear first on lower part of plant and move upwards

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Initial symptoms are small circular or oval chlorotic spots on leaves which develop light to dark brown centers; as the lesions expand, they may develop concentric zones

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Very small water-soaked spots between leaf veins which enlarge and turn dark brown to black

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Severely infested leaves may dry out and curl then drop from the plant.

Stems may have elongated dark streaks.

Solutions to the problem

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Irrigate plants in the morning to allow plenty time for plants to dry out during the day; irrigate at base of plant to avoid leaf wetness

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Use adequate plant spacings to decrease humidity in the plant canopy

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Bacterial leaf spot is difficult to control; plant pathogen-free seed; avoid overhead irrigation; do not work with plants when they are wet