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Fusarium Dry Rot and Wilt

Thursday, September 10th, 2009

(Fusarium spp.)

Different Fusarium species distributed worldwide cause various problems. Warm temperatures favours this disease.

Symptoms of Fusarium Dry Rot and Wilt

Dormant Oil & Lime Sulfur
Dry rot is one of the most serious potatoes storage problems. Tubers initially have dark, slightly sunken lesions that later expand superficially, leaving internal cavities that may contain different colour mycelia, depending on the species involved.
The margin of the rot is clearly defined.
Concentric rings appear on the potatoes tubers surface and external mycelium is evident.
Potatoes tuber dries and hardens.
Under humid conditions, secondary soft rot develops. Infection originates in surface fusaruim-dry- rot-wiltwounds during harvest and handling.
It can be reduced by initial curing at about 15°C and 95% relative humidity to promote wound suberization, prior to cold storage.
Improperly suberized cut seed decays under adverse soil conditions.
Potato plants may fail to emerge, or be weak and subsequently wilt and die.
Fusarium wilt fungi are soil-borne.
Symptoms are yellowing of lower leaves, chlorotic mottle of upper leaves, and subsequent wilting.
Vascular tissues of stems and tubers become discolored.
Potatoes tubers show several types of internal and external discoloration such as brown sunken necrosis at the stolon attachment or eyes, and circular brown rotted areas.
Warm weather enhances wilt. Some Fusarium strains become systemic and are seed transmitted.

Management

Use disease-free potatoes seed, good water management, and crop rotation. Treat cut seed with chemical protectants.


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