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Cauliflower > Leaves > Leaves wilt

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  • Image: Fusarium Wilt 1
    Credit: Krishna V. Subbarao, University of California Statewide IPM Program
  • Image: Fusarium Wilt 2

    Credit: M.E. Bartolo, Bugwood.org

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green arrowFusarium 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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  • Image: Bottom Rot/Head Rot 1
    Credit: Robert Wick, University of Massachusetts
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green arrowBottom 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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  • Image: Club Root 1
    Credit: Robert Wick, University of Massachusetts, Bugwood.org
  • Image: Club Root 2

    Credit: Jack Kelly Clark, University of California Statewide IPM Program

  • Image: Club Root 3

    Credit: Robert Wick, University of Massachusetts, Bugwood.org

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green arrowClub Root
Plasmodiophora brassicae

  • Leaves turn pale yellow, wilt during hot, sunny days, and recover at night
  • Young plants may die
  • Older plants fail to develop a head (blindness)
  • Roots are swollen in to large spindle shaped tumor like galls
  • Common in wet soils with a low pH (acidic)
  • More information on Club Root...
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  • Image: Black Leg 1
    Credit: Dr. Robert Wick, University of Massachusetts
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green arrowBlack Leg
Phoma lingam

  • Plants eventually wilt and topple over
  • Stem develops bluish black discoloration
  • Stem lesion becomes sunken brown with a purple black border
  • Leaves develop yellow spots with gray centers
  • More information on Black Leg...
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  • Image: Black Rot 1
    Credit: David B. Langston, University of Georgia, Bugwood.org
  • Image: Black Rot 2

    Credit: David B. Langston, University of Georgia, Bugwood.org

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green arrowBlack 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
  • More information on Black rot...
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  • Image: Cabbage Maggot 1
    Credit: Manitoba Agriculture, Food and Rural Initiatives
  • Image: Cabbage Maggot 2

    Credit: Department of Entomology, University of Minnesota

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green arrowCabbage Maggot
Delia radicum

  • Leaves turn yellow and may wilt
  • Maggot feeds on roots
  • Plants may be stunted
  • Maggot is legless and yellow-white in color
  • Present in early May and mid-June
  • More information on Cabbage Maggot...

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