Will this thread do for discussing disease as well as bugs?
I have some growth on my biggest, previously happiest leaves:
Last Thursday I moved my hops from a gallon planter indoors into the rised beds outdoors. The plant was delicate at first and so in wanted it to be strong before putting it outside (particularly to avoid over watering the roots as we can get a lot of water here [near west coast of Scotland]).
The biggest leaves have this growth which rapidly appeared over the weekend while I was away. There is general wind between 5-12 mph, and humidity has been between 70-80%. Temperatures have been between 15 and 20, but I have a clear plastic sheet suspended over the plant on one side to provide a bit more warmth while not getting in the way in terms of airflow.
It is spreading fast. I'm worried that it is powdery mildew.
Also, one of the heads has fallen off. It almost looks like it has been burnt where it fell off. I couldn't find anything that looks like that on the wikipedia list of hops diseases.
Here are a few more pictures including a bit more back story to the plant.
The early leaves when i got it look like this
but none of them have large white patches and I'm afraid to cut off the biggest, once healthiest looking leaves!