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Cabbage Integrated Pest Management : An Ecological Guide.

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Key to Some Common <strong>Cabbage</strong> Insect <strong>Pest</strong>s and DiseasesAffectedplant partLeafSymptoms/findingsLeaves are skeletonized: only the veinsremain, the leaf tissue is all gonePossible cause(s)Diamondback moth (Plutellaxylostella)Armyworms (Spodoptera sp.)Looper (Trichoplusia ni)<strong>Cabbage</strong> white butterfly (Pieris sp.)Leaf Leaves have black or brown round spots Insect damageLeafspot (Alternaria brassicae)Black leg (Phoma lingam)Bottom rot (Rhizoctonia solani)LeafLeaves have black or brown, irregularshaped, spots or dead areas<strong>Pest</strong>icide burnSunburnBlack rot (Xanthomonas campestris)Varietal characteristicNitrogen shortageLeaf Plant has a purple color on the leaves butotherwise looks normalLeaf Leaves are bluish green in color Varietal characteristicPhosphorous deficiencyPotassium deficiencySeesection5.15.55.85.9-8.58.88.4--8.2-8.9-8.98.9Stemborer (Melanagromyzacleomae) 5.11Petioles Maggots/pupae in large petioles of oldercabbage leavesStem Larvae and pupae inside stem Stemborer (Melanagromyzacleomae)Webworm (Hellula undalis)Roots Deformed roots, ‘clubs’ on the roots Clubroot (Plasmodiophorabrassicae) 8.6Whole Discolouring, wilting, roots start to rot Water logging 3.9plantWholeplantPlant wilts during warm daysWater shortageClubroot (Plasmodiophorabrassicae)Stemborer (Melanagromyzacleomae)3.98.65.11WholeplantWholeplantPlants stay very small and no headsdevelopPlant falls over, stem is rotten at the soillevelCaterpillars/larvae in the soilPupae in the soilPupae on plantsClubroot (Plasmodiophorabrassicae)Bottom rot (Rhizoctonia solaniPoor soil structure - localizedStemborer (Melanagromyzacleomae)5.115.78.68.43.45.11Black leg (Phoma lingam) 8.8Cutworms (Agrotis sp.)Flea beetle (Phyllotreta sp.)Cutworms(Agrotis sp.)Armyworms (Spodoptera sp.)Diamondback moth (Plutellaxylostella)Looper (Trichoplusia ni)<strong>Cabbage</strong> white butterfly (Pieris sp.)5.45.35.45.55.15.85.9189 <strong>Cabbage</strong> <strong>Ecological</strong> <strong>Guide</strong> - 2000

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