Ring Rot potatoes disease
(caused by Clavibacter michiganensis ssp.)
Sepedonicus Bacterial ring rot is a recurring disease problem in temperate regions.
It occasionally appears in tropical countries when seed from temperate regions is used, and can be confused with brown rot.
Symptoms of Ring Rot potatoes disease
Symptoms usually appear mid-season or later and include wilting (often of only some stems of a plant). Lower leaves become flaccid, with a pale yellow color between major veins. An upward rolling of leaf margins may occur, and death may soon follow.
Stem and tuber sections show brown vascular rings that, when squeezed, may exude bacterial ooze. Most of the tuber vascular ring rots and turns either gray, yellowish, tan, or reddish brown. However, secondary organisms may cause a soft rot. Tuber infection can be confused with bacterial wilt (or brown rot), except that oozing around the eyes does not occur.
Ring rot is mainly a seed tuber-transmitted disease. It survives in volunteer potato plants. The bacterium does not survive in the soil but may be carried on tools, machinery, crates, and bags.
Management
Plant only disease-free seed. Eliminate volunteers in the field before planting clean stock. Follow strict sanitation practices and disinfest bins, equipment, tools, and crates. Use new bags. Plant entire (not cut) seed tubers.
Riptide 6 Week Pest Control
August 11th, 2010 at 3:32 am
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