USDA Forest Service
 

Forest Health Protection, Southern Region

 

USDA Forest Service
Forest Health Protection
Region 8
1720 Peachtree Road, NW
Room 816 N
Atlanta, GA 30309

Phone: (404) 347-7478
Fax: (404) 347-1880

United States Department of Agriculture Forest Service.

USDA Link Forest Service Link

 

BROWN SPOT NEEDLE BLIGHT,

caused by Scirrhia acicola

 

Importance. - Longleaf pine is the only species in the South that is damaged by this disease. Seedlings are often heavily infected while in the grass stage and often die after repeated defoliations.

Identifying the Fungus. - Boat-shaped spores are produced in the yellow bands on the needles. Positive identification can be made by examining the spores under a microscope.

 

 

Spots and discoloration caused by the fungus

Spots and discoloration caused by the fungus.

 

 

Identifying the Injury. - Infected needles develop grey-green spots, which later turn brown. Eventually, a yellow band develops on the needle. The affected area then increases in size, resulting in death of the needle.

 

 

Brown spot needle blight on longleaf seedling

Brown spot needle blight on longleaf seedling.

 

 

Biology. - Spores are released from the fruiting bodies (acervuli) on the needles throughout the year. The spores are splashed short distances by rain drops. During the winter and early spring, perithecia are produced on dead needles. Spores from these perithecia are responsible for longer distance spread of the fungus.

Control. - Plant resistant or high-quality seedlings on intensively prepared sites. When seed trees are used, burn in the fall to destroy diseased needles. Where seedlings are established, burn during the dormant season. Remove seed trees when seedlings are 1 or 2 years old. Fungicide sprays are effective in controlling this disease in nurseries.

 

 


USDA Forest Service - Forest Health Protection, Southern Region
Last Modified: Monday, 16 December 2013 at 14:18:29 CST


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