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I am an oyster mushroom grower in Zimbabwe, I have some challenge I would like helped on. I use wheat straw as a substrate.
1. My mushroom are fruiting the bottom part only. 2. There are lumps developing oround the bags like some fried eggs what is it and how do I correct the abnomality, it caused the second flush not to come out. The lumps are whitish and it seems it is mycelium that has overgrow foaming a continuos layer around the bag.
I had this problem when the substrate in the bag dried out. Oyster mushrooms only formed at the bottom where there was still some moisture. Small mushrooms that formed at the top of the bag dried out and got covered by mycelium and new primordia. Watering the bags helped. I had a reasonable flush afterwards.
Could this be the cause of your problem?
What species of Oysters are you growing? What are your growing conditions (incubation, fruiting)?
http://www.mushworld.com has great information on the cultivation of mushrooms in tropical countries. Check it out if you don't know it already.