Hello everyone,
I am relatively new to this board and I am quite excited to learn more about orchids and their proper care, maintenance, and treatment of diseases. I am also quite inexperienced with these little guys since I was just given a few of them about a month or two ago and now am trying my best to learn more about them. However, as all living things, some of my orchids are showing what I am suspecting can be diseases. One example (and the main subject of this thread) is my dendrobium mangosteen, which was given to me about 3 weeks ago. I immediately noticed that the two of the canes from this orchid were shriveled and not doing so well. I took the plant out of its old potting media and repotted in a clay pot with bark and pieces of charcoal. I also noticed that most of the roots were white/ beige in color, very few of them were green, although I am not sure if this is normal for dendrobiums. Some of the roots' velamen had come off so I proceeded to cut what I considered dead and left the other sturdy roots alone.
Freshly potted, with humidity levels fluctuating between 60 - 80% (with two fans as ventilation), artificial overhead lights, and indirect sun light through an eastern window, I started to notice some signs of concern on my plant. Some of my mangosteen's leaves were faltering as seen in the pictures below. I am thinking that this may be some sort of rot. Although, I cannot confirm. The pictures do follow a chronological order, so the very last one depicts a brown spot/ blotch on one of the top leaves. Curiously enough, (although I am not sure if relates to this) we had a front cold come in today and the temperature in the house dropped to 15 Celsius. I unpotted today after seeing this to inspect the root system, but the roots still look white/ beige just like in the beginning. There are no signs of new roots growing. To top it all off, I noticed the smallest shriveled cane had some black coloration on it... so that raised my alarm even more.
I water once a week doing a full soak of the media only. I fertilize weakly twice a month. The pot has excellent drainage and the media does go dry. I am quite confused because to my knowledge dendrobium mangosteen does not go dormant (please correct me if I am wrong on this assumption). So, I hope that by reading my story and looking at the pictures I am able to get some guidance as what approach I should take with this little guy or if this is any sort of disease or not.
pictures:
https://drive.google.com/open?id=0B3...zF1LVhTUGZOd0k
https://drive.google.com/open?id=0B3...FZBOF9ydlJ6UUk
https://drive.google.com/open?id=0B3...V80NXpsSWFCWlk
https://drive.google.com/open?id=0B3...ldZZnlnaUNKVnM
https://drive.google.com/open?id=0B3...2ViTnpiVTNCaXM
https://drive.google.com/open?id=0B3...DlOeHRlbHBWWm8
Thank you
Sick dendrobium? Yellowing/ falling leaves, shriveled canes, and brown-ish leaf spot
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