Black spots on phal

[Sherrie]

Can anyone tell me what black spots on the back of leaves is caused from. I am a newbie and don't want to lose these. Thanks if you can help.

[Ellen]

A photo of the spots would help.

[Willc73]

Several things can cause that. A picture would help a lot. First see if they come off or not. You don't want to freak out about dirt.
When I get a mite infestation, that usually causes black spots on the bottom of Phal leaves. You do want to control that if that is what it is, Mites can take down a collection in no time. A good thing to invest in is some Enstar and Tetrasan. These are two pesticides that are the safest and most effective. Tetrasan is also an Ovacide so you won't have outbreaks later if used correctly. As far as safety, these products are 20 times safer and more environmentally friendly then anything you will find in the local store , including rose spray or mild pesticides. It is expensive stuff, but worth it.
Your black spots may also be a fungus infection, or other possible issues. If the spots start to come through the top of the leaves, be careful.
Ants will also harvest mites and scale, so be aware of any ant problems.

[Sherrie]

Thank you guys. I am working on pictures. I bought all of these orchids at Meijers. 2 or 3 are affected. One has the black spot that does go thru. The Tetrasan and Enstar..where do you find it? Also can you treat the leaves if they do not need it? I am so new at this but I don't want to loose all of these. I have 11 orchids now because I love them so much and I love and appreciate this site greatly. I will work on the pictures. Thanks so much!!!!

[Willc73]

You would need to treat all the plants if it is mites. You can purchase at hummert.