The Orchid Doctor Articles under the Heading Physan

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
PHYSAN: Viruscide 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 0

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