Physan 20

[ericst11]

Has anyone heard of people that use physan 20 in there watering solution in a dilute form. I was talking to some one and they told me they did that once a month as a wetting agent and damping off. I don't know.

[rtsingleton]

I have an on again off again relationship with it, has never hurt any plants and seems to do a good job keeping the brown uglies away...

[Brooke]

I wouldn't use any chemical unless I thought I had a problem. It would be like taking aspirin every four hours to make sure you don't get a headache.

Save the money and buy more orchids :>)

Brooke

[K.C.]

Yes it works as a wetting agent and helps with damping off. But I have moved on to Crystal White as a wetting agent.

[nhman]

Yes I have. If used in dilute form, it is relatively safe for anything, except perhaps any mold and fungus. And then, there is a question if it would work for even those problems in it's diluted form.

[orchideric]

Hey Eric,

Physan is a bacteriacide/algicide that has a secondary effect on fungus (but won't serve as a cure for a fungal infection). If used in dilute form - not more than 1 teaspoon per gallon - it doesn't have any deleterious effect on orchids used sparingly like once a month.

It's best use is in a more concentrated solution for walkways, greenhouse walls, and benches - but NOT allowing it to hit any plants. A Tablespoon per gallon can be used on non-plant surfaces.

During grey days up north, a real quick spray of really dilute solution - like 1/4 teaspoon per gallon - on the walls and ceilings of a greenhouse after watering can act as a surfactant and eliminate cold drips.

It is routinely used in hospitals and is quite safe to people and pets.

Hope that helps, Eric

[BikerDoc5968]

Orchideric is correct. I use a product called RD-20. It is EXACTLY the same composition as Phyan 20, just made by someone else and costs about the same. This is the manufacturer's lable about its use on ochids:


ORCHIDS
Seedlings: Soak seedling 2-5 minutes before potting to remove agar. To help prevent damping-off caused by Pythium, Fusarium or Rhizopus,
spray seedlings once per month as preventative maintenance. Spray any time disease is evident with a solution of 1.5 tsp. R-D-20
Greenhouse Disinfectant per gallon of water.
Adult Plants: Spray any time disease is evident with a solution of 2 tsp. R-D-20 Greenhouse Disinfectant per gallon of water. Spray once per
month as preventative maintenance.
Dividing Plants: Remove compost, then soak plans for minutes in a solution of 1 tbsp. R-D-20 Greenhouse Disinfectant per gallon of water.
Operate with wet hands and cutting tools. After division and root trim, soak divisions in the solution for 2 to 5 minutes. Pot in compost drenched
with the R-D-20 Greenhouse Disinfectant solution.
Botrytis Petal Blight: During cool weather, spray plants, flowers and under benches at first sign of spotting on flowers. Normally, weekly
sprayings will greatly reduce or eliminate the botrytis spotting. Use 1 tsp. of R-D-20 Greenhouse Disinfectant per 3 gallons of water.
Cut Flowers: containers. tubes and decorative vases. Recommend flower spikes be hardened in a solution of 1 tsp R-D-20 Greenhouse
Disinfectant per gallon of water during harvesting, storage and shipping to help control the transfer of diseases.
Rots (Such as Erwinia. et al): Remove compost from plant, then soak entire plant 10 minutes or more in a solution of 1 tbsp. R-D-20
Greenhouse Disinfectant per gallon of water. Cut away all rot with treated tool. Soak plant wounds again for 10 minutes in solution. Repot in
drenched compost.
Crown Rot: Spray plants weekly with a solution of 2 tsp. R-D-20 Greenhouse Disinfectant per gallon of water.