Brassica Problem

Photos and text by Debbie Roos, Agricultural Extension Agent.

November 2007

Diagnosis Pending

This problem is showing up in cauliflower, kale, and other brassicas on a new field on an organic farm. Lower leaves are yellowing and dropping off. The veins and mid-ribs of leaves become necrotic. Leaves are sometimes cupped with necrotic margins. Leaves show some mottling and chlorosis. Severely affected plants are stunted and weak and less cold hardy - many were killed with a recent frost (see photos below). The affected area is confined to a "hot spot", radiating out from a central location. Initial pH was around 5.2 and the soil was amended in August with composted manure, hi calcium lime and wood ash. We suspect a nutritional deficiency exacerbated by acid soil.

symptoms appear in other brassicas such as kale

yellowing of lower leaves


brassica symptoms in the field

close-up of leaf

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This page last updated August 17, 2008.

 

 

North Carolina Cooperative Extension, Chatham County Center
P.O. Box 279, Pittsboro, NC 27312
919-542-8202

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URL: www.growingsmallfarms.org

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