Mushroom mite

Pygmephorus sellnicki is a member of the Pygmephoridae family within the Trombidiformes order. It is a well-known pest in the mushroom industry, particularly impacting commercial white button mushroom (Agaricus bisporus) cultivation worldwide.

This mite species feeds primarily on the mycelium of mushrooms. By consuming the fungal hyphae, the mite damages the structure of the mycelium, which directly inhibits the formation of primordia and reduces the overall yield of the crop. The mite acts as a significant limiting factor in mushroom productivity.

The biology of Pygmephorus sellnicki is perfectly adapted to the environment of a mushroom house. The mite thrives in the high-humidity, temperature-controlled conditions required for fungal growth. Its rapid reproductive rate allows it to build up massive populations within a single cropping cycle, especially if initial hygiene measures are inadequate.

The damage caused by this mite is often initially invisible to the naked eye until substantial mycelial loss has occurred. Affected areas show reduced growth of the white mycelial threads, eventually leading to dead patches. In advanced stages of infestation, the mushrooms produced are of poor quality, often showing deformation, and may be accompanied by secondary infections from other fungi or bacteria.

Effective management against Pygmephorus sellnicki relies on rigorous sanitation practices:

• Ensuring thorough pasteurization of the casing soil and substrate to eliminate all life stages.
• Implementing strict biosecurity protocols, including disinfecting tools and controlling movement within the farm.
• Using fine-mesh filters on intake air ducts to prevent airborne mite dispersal.
• Applying certified acaricides specifically labeled for use in mushroom production to suppress mite outbreaks.