Aerangis with deformed growth

[unhappykat]

Hello All,

Over the last few months I have noticed a strange growth habit emerging over many of my Aerangis mystacidii, somalensis, luteoalba, and several other species and hybrids in my greenhouse.

I have attached photos of the newest growths on three plants showing a rather extreme version of the deformed growth, others vary with somewhat normal foliage that is now much more compact in size. The plants do not seem to be suffering from this as many have flowered and flushed roots as normal but they are unsightly for shows and exhibits.

The plants in the photo are Aerangis mystacidii, somalensis, and their hybrid but there are 5 other species and a few hybrids all showing this same growth habit. It seems to be affecting the faster growing species at the moment, the slower plants may also exhibit it eventually but it will take some time for it to become noticeable.

Has anyone else had, or is currently having, this problem with their plants? Any recommendations on how to remedy it would be appreciated.