We tested this hypothesis using the Alternaria dauci – carrot pathosystem. Alternaria dauci, causing carrot leaf blight, is a necrotrophic fungus. Carrot is among the most important vegetable crops because of its composition and vitamin content. The fungi belonging to genus Alternaria, especially A. dauci . A. dauci is a fungal species with an ability to cause symptoms on a large range of dicotyledonous plants. This fungal species harbors a strong.

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Two species of Alternaria cause disease of carrots- A. Also present in all parts of the world where carrot are grown, A.

Foliar symptoms of A. Older leaves are more susceptible to infection. Petiole lesions are common, elongate, and can quickly kill entire leaves. The fungus survives in the soil on crop debris but dies when the residue decomposes.


Initially, infection may occur on the petioles as shallow, black lesions which later alternria into the crown and down the root. It can persist in soil for up to 8 years.

A altrrnaria, mealy, black decay may develop when carrot roots are held in storage. Foliar symptoms caused by A. North American Amphibian Monitoring Program.

North American Aquatic Connectivity Collaborative. Back to top Carrot, Alternaria Leaf Blight.

Alternaria dauci Alternaria radicina Two species of Alternaria cause disease of carrots- A. Practice relatively long rotations of years. Prompt incorporation of carrot residues after harvest speeds decomposition of the crop debris that harbors the pathogen. Minimize wounding and breakage.

Both Alternaria diseases are hard to target with fungicides once the crop canopy has closed.

Home Page – Carrot resistance to Alternaria dauci leaf blight

Subsequent chemical applications should be based upon disease severity and weather that favors disease development. Use of spray forecast models based upon the accumulation of disease severity values like Tom-Cast for tomato Early Blight disease is recommended. Crops that are affected by this disease: