U of M Gardening Information: What's wrong with my plant?

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Cauliflower > Leaves > Brown leaves

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Credit: David B. Langston, University of Georgia, Bugwood.org
Credit: M.T. McGrath, Cornell Univesity
Credit: David B. Langston, University of Georgia, Bugwood.org
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Black Rot
Xanthomonas campestris

Leaves wilt, turn yellow and eventually turn brown and die
Yellow V-shaped lesions develop on margin of leaves, the point of the v follows a vein towards the base of the leaf
Black veins can be seen in infected leaves, petioles and stems
Sticky yellowish liquid bacterial ooze may be seen if infected veins are cut
Disease favored by hot, humid conditions
Cauliflower head turns uniformly brown when infected
More information on Black rot...

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Credit: M.E. Bartolo, Bugwood.org
Credit: Krishna V. Subbarao, University of California Statewide IPM Program
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Fusarium Wilt (Yellows)
Fusarium oxysporum f.sp. conglutinans

Affected leaves wilt, eventually turn brown, become dry and brittle, and may fall off
Plant has a yellowish-green overall color that often occurs only on one side of the plant
Lower leaves yellow first, yellowing progresses up the plant
Stem and midrib of the leaf curve to one side
Veins in affected leaves are yellowish brown

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Credit: Robert Wick, University of Massachusetts
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Bottom Rot/Head Rot
Rhizoctonia solani

Leaves turn yellow/brown and wilt
Bottom of lower leaf develops sunken, black, and elliptical lesions parallel to the midrib of the leaf
Dark cobweb-like or cotton-like fungal growth develops between diseased leaves
Disease may be limited to the lowest leaves or may start at the bottom of the plant and move up through wrapper leaves into the cabbage head

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