We like these glue board, but they are a bit expensive. We use 3 of them almost every day. I wish we could purchase them in a very large quantity and get the price down to something affordable. We have a small organic mushroom farm and we use one glue board per room per day to catch the tiny black gnats. They need to be changed daily.
We would recommend using some additional methods for controlling the flying insects in the area. It sounds like they are fungus gnats (we apologize that this seems obvious); they are usually found from overwatering. Obviously you cannot eliminate the moisture or the actual fungus, so we would recommend first to thoroughly clean the rooms with high pressure water to remove any possible breeding sources that are not the mushrooms themselves.
Secondly, you may want to add an additional trap, such as the Suterra Yellow traps: http://www.domyownpestcontrol.com/suterra-medium-yellow-sticky-trap-10-pack-p-9864.html. The color on these makes them highly attractive, and they are moisture resistant, so they won't loose their stickiness in the damp rooms.
If you are able to use non-organic products in the area without contacting the plants, Gentrol Aerosol IGR is a ready-to-use foaming growth regulator that would help reduce the population: http://www.domyownpestcontrol.com/gentrol-aerosol-igr-16-oz-can-p-192.html.
You could also possibly use some organic diatomaceous earth in cracks and crevices. Just be careful not to apply it where it will may become fully wet. St. Gabriel's Organics make a good Organic DE: http://www.domyownpestcontrol.com/organic-diatomaceous-earth-p-2692.html.
We are also always happy to assist you by telephone as well at 866-581-7378 M-F 9a-5p EST.
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