Question

Rash   Hey guys,

I've been ignoring this problem for a while now, but since it seems to have spread, I figured I'd try to get some help identifying it. Just like the title says, my singalana Tujuh has developed a strange rash, which began at the stem, and has since spread to the leaves. I'm quite nervous about it, because I have it in my rack, growing quite closely together with some rare and expensive species. Quarantine time?

Anyway, I haven't been able to find anything quite like it on google, so I thought I'd ask.


Thanks,
Mat

Answer
It's difficult to say what it is exactly.  The first thing that came to mind was thrips, but usually the damage is done on upper side of the leaf, and the leaves are slightly deformed.  I'm not seeing any leaf deformation other than discoloration.  Without being able to examine the plant up close, it's just difficult to determine if a pest is the culprit.

Another possibility is rust spots, a type of benign fungal infection.  It's completely harmless to the plant, but it does cause cosmetic damage.  Rust spots will sometimes occur when a plant is exposed to cool temperatures.  I can't imagine that it's been too cool in your grow area, otherwise you would see it on your other plants.

Rust spots can also occur if there is microscopic damage to the tissue.  The damage could be from handling the plant or from a pest.  Mites could also be a factor.

In this particular case, I'd recommend using Bayer 3-in-1.  It contains a systemic insecticide and a systemic fungicide.  This product is safe to use on Nepenthes as long as you follow the directions on the bottle.  It won't get rid of the discoloration, but it will prevent it from spreading.  You could also spray your other plants as a preventative measure.

The application will last for a month.  During that time, look over your plant periodically.  If it's spreading, you'll need to take out a magnifying glass and look closely at your plant for mites, which would require a different type of treatment.  For now, treat it with the Bayer product.  

Good growing!
Jacob Farin