It's my first time gardening and since I am without a job for the summer I have taken on a massive garden on my yard. We had an unusually wet and chilly spring and a lot of my stuff was slow to start. I planted my fava beans on April 2 and they are now over one foot tall. This morning I noticed brown spots on the underside of the lower leaves and on some of the stems. I am worried it is a disease, but the plants seem healthy so I'm hoping to get the advice of more advanced gardeners. Thank you! Oh, and I'm in Burnaby, BC :-)