We have seen a dramatic mushroom show this year, especially in the past couple of weeks. Here is the skinny:

• Mushrooms grow in organic material. Humus rich mediums such as mulch and composted soil provide a wonderful place for fungus to grow.
• There are fungus spores everywhere, including in the air you are breathing right now.
• Mushrooms and other funguses do best when there is ample moisture and the right temperature. This year has been very wet, and ideal from a temperature standpoint, so funguses are more noticeable this year than past years.

The three items mentioned above represent the three legs of the Pathological Triangle. Mulch and compost play the role of the “susceptible host”, fungus spores play the part of “presence of the pathogen”, and the moisture has fulfilled the requirement for a “suitable environment.” With all three in play, we should expect to see a lot of fungus at work.

What to do about it?

Though most of this is beyond human control, there is some amount of effort we can apply to improve the situation.

• First, control moisture in the effected area as much as possible. Shut off irrigation. If watering is necessary, water only at the base of the plant, only in the early morning (before 10:00 am).
• Second, disturb the medium. Rake the mulch to knock down the fungus. Some funguses make large patches, which should be removed and disposed (this can often be done with minimal loss of mulch). Cultivating the mulch in this manner will also allow air into the humus-rich layer which grows the fungus. This aeration will help to dry out the humus, and make it less wonderful for the fungus.
• Third, if the problem is really bad, or really persistent, a fungicide can be applied. Always read and follow label instructions. In my opinion, only do this if absolutely necessary.
• Finally, remember that “this too shall pass.” The weather in our area changes on a regular basis. It will eventually dry out, and at that time, funguses will not be as much of a problem.

On toward excellence!

Trent