Spots on Den leaves

[gngrhill]

I don't know what's up with my Dens. The first plant to get these spots started out with spots like these pictures, progressing to leaves turning yellow and falling off. These are Phal type Dens and my microchip. I have sprayed with peroxide and physon 20, and it still progresses. I would love to know what's going on and what to do about it before it claims all my Dens.
I have fans going 24/7, humidity ranges from 55 to 70 percent temps from daytime highs of 70 -75 and night time lows of 55 - 60. T-5s on for 10 hours a day. Anyone got any ideas ??

[campchi]

Looks like it got too much light. Do you spray your plant regularly? If you do, that explain about the spot, i could be wrong. It's a good start, maybe raise your T5 a bit higher. Maybe other can chip in with their experience.

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[gngrhill]

Originally Posted by campchi

Looks like it got too much light. Do you spray your plant regularly? If you do, that explain about the spot, i could be wrong. It's a good start, maybe raise your T5 a bit higher. Maybe other can chip in with their experience.

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That was my first thought, so I moved them out from under the t-5s. Maybe I waited too long. I don't spray the orchids as a regular thing, Just if I think I need to apply the peroxide or physon. I also understood that the Dens like high light and high temps, so I wouldn't have thought the t-5s would hurt them. There is about a foot and a half between the top leaves and the lights.
I have moved them out from under the lights, and thanks for your thoughts.

[Leafmite]

After killing the last Microchip (as well as the two 'parents') and wanting to try again, I asked at my OS and was told that these prefer higher humidity, shade, plenty of water and warmth all year. I am giving that a try right now and it seems to be thriving.
I am not sure what is going on with your Phal-type Dendrobium but hopefully others will help. I always grew these in the window and this is the first year that I am growing one of them under lights. :|

[campchi]

While den phal likes high lights, but if there's water spot from spray, when hot enough, the leaves will get burns. I had that happen to my den phal. Hope thar helps. If the leaves keep preading, just remove the leave.

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[gngrhill]

Originally Posted by Leafmite

After killing the last Microchip (as well as the two 'parents') and wanting to try again, I asked at my OS and was told that these prefer higher humidity, shade, plenty of water and warmth all year. I am giving that a try right now and it seems to be thriving.
I am not sure what is going on with your Phal-type Dendrobium but hopefully others will help. I always grew these in the window and this is the first year that I am growing one of them under lights. :|

Thanks for the info..As per my previous post, my humidity is between 50 and 70. Seems like that should be enough. I water it nearly every day, temp range, IDK, maybe it's too cool now with the change in weather ...... 55 nights and 75 days. I'm not sure what they mean by shade. They also recommend shade for Phals and Paphs, but mine do great under the lights, so I don't know if I should take microchip out from under the lights or not. I have taken the Den Phals out to the side. Microchip is in advanced bud. It is about 2 and a half feet under and slightly to the back of the lights.

[silken]

I have a Phal type Den. and its leaves do the same thing and fall off sooner than I want them to. I keep it under a T5 and never get water on the leaves. I think it is rather common for them to do that. Not sure why. Mine is blooming right now despite having just dropped its last leaf after being covered with those types of spots. I have given it the odd fungicide/bactericide treatment and it doesn't seem to help either. A heat mat might help keep yours a little warmer.

[wintergirl]

Dens can be funny about watering especially when cold and will do stuff like that. Just watch about watering late and too much now. It may drop leaves but should grow some more back.

[silken]

Originally Posted by wintergirl

Dens can be funny about watering especially when cold and will do stuff like that. Just watch about watering late and too much now. It may drop leaves but should grow some more back.

I sure hope so. Mine is rather naked. Maybe I should keep it in the house for the winter, but I don't have super good light all day for it in the house. So it lives with all the rest in the greenhouse. I need an extra heat mat I guess. I have 2 that run all winter.

[Leafmite]

Both types of Dens do like temperatures always over 60's F. Are the leaves dry in the cooler temperatures?
With lights, 'Shade' just means that the lights are further away. If your Phals and Paphs are happy with the lighting, your Microchip should be, too.