Disinfectants and potato ring rot control
Mercuric chloride (1:500) and Semesan Bel (1 lb./4 gal.) were superior to the other materials tested as cutting-knife disinfectants.
The quaternary ammonium compounds of the general formulation alkyl tolyl methyl trimethyl ammonium chloride were very efficient
in the disinfestation of jute, wood, and metal surfaces when instantaneous killing action was not required.
When cut sets of a susceptible potato variety were placed in a contaminated potato bag. a high percentage of ring rot appeared
in the succeeding crop.
Contaminated potato bags soaked in tap water transmitted bacterial ring rot to fewer cut sets than did unsoaked bags.
Under the conditions of these experiments, approximately 250 bags could be safely treated in 40 gal. Hyamine 2389 (300 ppm).
Although some of the materials which were treated as seed-piece disinfectants considerably reduced the amount of ring rot
in the succeeding crop, they were quite phytotoxic and cannot yet be recommended for commercial use.
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ABSTRACT: Some disinfestants are claimed to be more effective than others in controlling ring rot (Corynebacterium sepedonicum) and blackleg (Erwinia carotovora varatroseptica) bacteria on contaminated surfaces. Of the readily available disinfestants tested mercuric chloride (0.1%) and formaldehyde (2% and 5%) were the most effective against blackleg bacteria, and bleach (10%) mercuric chloride (0.1%) and formaldehyde (5%) were the most effective against ring rot bacteria on metal, wooden and burlap surfaces.American Potato Journal 01/1977; 54(9):405-409.