The mycoparasitic fungus Lecanicillium fungicola, better known as »Dry bubble
disease«, causes damage to cultivated mushroom species, especially the button
mushroom (Agaricus bisporus). Colony colors range from white, white-brown, whiteyellow, cream to other faded shades of primary white. The reproductive structures are
conidia (asexual spores). The optimal temperature for growth is 18 to 24°C, with no
growth observed above 30°C. In nature, it is found wherever organic material
decomposes and is transmitted by contact. The pathogen is visible on its host as a »dry
bubble« and leads to visible deformation and stunting of the host. If the infection occurs
in the early stages of growth, the mushroom does not reach its theoretical potential. The
pathogen spreads rapidly throughout the mushroom after sporulation, primarily
affecting the initial infection site and spreading in the direction of airstream. Crop losses
of up to 30% is possible. There is currently no effective protection against the pathogen,
as it quickly develops tolerance or the active ingredient in the fungicide is too aggressive
towards the cultivated mushroom. Some fungicides are used for protection, but the most
effective measure at present is strict hygiene in mushroom cultivation, including
antiseptic clothing, air filtration, and disinfection of premises, tools and equipment.
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