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Compendium of Potato Diseases - (PDF, 101 mb) - USAID

Compendium of Potato Diseases - (PDF, 101 mb) - USAID

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110<br />

Galls<br />

White to brown-powdery scab. smut<br />

On tips-wart<br />

Roots<br />

Galls<br />

White to dark brown-powdery scab, root-knot nematode<br />

As beads along root-false root-knot nematode<br />

Cysts, white to brown-cyst nematodes<br />

Brown lesions-skin spot<br />

Cortical decay<br />

Dotlike sclerotia-black dot<br />

Large sclerotia--- Rhizoctonia<br />

Cortical injury- lesion nematodes<br />

General rot-Fusarium wilts<br />

Necrosis<br />

Brown to black -pink rot<br />

Dark, covered by gray white mycelium--Rosellinia<br />

Poor development- potassium deficiency, phosphorus deficiency,<br />

nitrogen toxicity<br />

Stunted--magnesium deficiency, boron deficiency, aluminum to:(icity,<br />

cyst nematodes. stubby-root nematode<br />

Proliferation <strong>of</strong> lateral roots--cyst nematodes, root-knot nematode<br />

(Prepared by W. J. Hooker)

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