PHYSAN: Viruscide

Ailments Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 8 years ago.

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All quaternary ammonium compounds, which this is are oxidizers and when used to sterilize cutting tools they need to be dried out for the necessary action to take place. OA81-152
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Physan Comments
PHYSAN 20: Active Ingredients It is a combination of quaternaray ammonium chlorides, like Shield, Roccal, etc. A77-702; RMHN-alkyl (60% C14, 30% C16, 5% C18) = 10%; n-alkyl (68% C12,32% C14); dimethyl ethylbenzyl, ammonium chlorides = 10%; inert = 80%. Physan 20 label. 0
PHYSAN 20: Algicide, Bactericide, Deodorizer, Fungicide and Viruscide It is useful in wet and humid places; can sterilize some cutting instruments if immersed for about 12 minutes. A73-811 0
PHYSAN 20: Application Use 1/2 to 1.5 tpg. for most fungus and bacteria; use 2 ttpg. for sterilizing tools. A79-272 0
PHYSAN 20: Deterioration on Standing It loses its effectiveness by repeated use but the solution may not deteriorate just on standing. A76-14 0
PHYSAN 20: Harmful to Some Plants It has harmed roots of paphiopedilum at one-quarter strength solution when plants were dipped at repotting. A78-302 0
PHYSAN 20: Properties The new (1979) name for Consan is Physan 20; use it to sterilize tools (slowly) control algae, and many diseases of orchids; it can also prolong the life of cut flowers. A76-115; A79-1112;C72-169 0
PHYSAN 20: Spraying Monthly Too frequent spraying with it may cause toxicity; use benomyl occasionally alternately. A80-254 0
PHYSAN 20: Sterilizer It takes 10 or more minutes to sterilize tools in it. A79-1022Plastic pots can be disinfected in a solution of 1 ttpg.; rinsing afterwards is not necessary as the plants are not harmed on contact. A76-14; C72-42 0
PHYSAN 20: Sterilizing Equipment It is effective against virus if the soaking lasts overnight. A75-1090 0
PHYSAN 20: Tested as a Disinfectant for Virus One-fifth ounce in one gal. water inactivated the crude juice of Tobacco Mosaic Virus; one ounce in three gals, water inactivates it on cutting tools, work bench, pots, compost, tags, stakes, hands and plants. OD72-140 0
PHYSAN 20: Wide-spectrum Fungicide and Bactericide Composed of n-alkyl dimethyl benzyl ammonium chlorides. AH15 0
PHYSAN: Bacterial Action Studies have shown that it has good action in combatting bacteria as compared with other agents, especially on the germs Enterobacter and likely Erwinia; considerations of associations with excremental remains of insects, etc.; Diazinon tested showed no significant bactericidal effects. A80-1368 0
PHYSAN: Characteristics It is quite alkaline and if combined with another alkaline product such as soap it might cause a problem. A88-296 0
PHYSAN: Its Various Uses It can be used for cleaning benches, sterilizing pots, etc. at lttpg.; for treating damping-off on seedlings at 1|tpg; for combating bacterial rot, at 2tpg. A82-487 0
PHYSAN: Not Registered for Use on Orchids Its use could be authorized by the U.S. Dept. of Agriculture; it requires sufficient pressure brought to bear through petition. A86-915 0

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