Spider mites may be the symptom to the problem.
I'm taking a guess at it. But according to the picture, I think your Dendrobium is way overpotted. Dendrobiums like to be pot bound like no other. Roots will go bad quickly if that's the case.
I also noticed you have a saucer under your pot. Do you let water sit in the saucer for days? Do you water your plant by filling up the saucer and letting the pot sit in water for more than a minute?
You didn't mention your watering habits. Did you water once a week or more than that?
I gather you're growing the Dendrobium indoors. Did you turn on the AC? Some Dendrobium spp. or hybrids are intermediate to warm growing.
I tend to forget this fact about orchids often so I'll just metion it as a reminder for everyone including myself...
Orchids don't always respond as quickly as some other flowering plants do to changes in the environment and stimuli. So signs like overpotting and/or overwatering an orchid may not show up until months later. This includes having the plant grown in the wrong temperature range.
|