Leaf Blight of Carrots

Alternaria dauci and radicina

Description:

A fungal disease that causes small spots on leaves that are surrounded by a yellow area giving an overall yellow appearance to the leaves. These develop to brown patches and may extend to the petiole and kill the leaf.

Species Affected:

Carrots.

Biology:

Favoured by rain and heavy dew.
Carried on seed.
Spread by wind.

Life Cycle:

Origin and History:

Distribution:

Significance:

Management and Control:

Use healthy seed. Home garden seed is often infected.
Rotate to resistant species.
Remove and destroy infected plants immediately.
Apply fungicides at the first sign of disease.

Related and Similar Species:

References:

1291

Acknowledgments:

Collated by HerbiGuide. Phone 08 98444064 or www.HerbiGuide.com.au for more information.