M. Mehrparvar - Department of Plant Pathology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box: ۱۴۱۱۵-۳۳۶, ‎Tehran, Islamic Republic of Iran.‎
E. Mohammadi Goltapeh - Department of Plant Pathology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box: ۱۴۱۱۵-۳۳۶, ‎Tehran, Islamic Republic of Iran.‎
N. Safaei - Department of Plant Pathology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box: ۱۴۱۱۵-۳۳۶, ‎Tehran, Islamic Republic of Iran.‎

Dry bubble disease is one of the most important serious diseases of the cultivated white button mushroom (Agaricus bisporus (Lange) Imbach). It is a cosmopolitan disease having a worldwide distribution. Ten isolates of Lecanicillium fungicola var. fungicola (Preuss) Zare and Gams were collected from mushroom farms. Sensitivity of the isolates to benomyl, carbendazim, carbendazim+iprodione and prochloraz manganese were studied. All the isolates were resistant to benomyl(ED۵۰= ۴۱۵.۴۵-۷۴۸.۱۲ mg L-۱), carbendazim (ED۵۰= ۱۱۲۳.۸۷-۱۸۷۹.۵۹ mg L-۱) and iprodione+carbendazim (ED۵۰= ۴۱۵.۴۵-۷۴۸.۱۲ mg L-۱). However, most of the isolates were sensitive to prochloraz manganese (ED۵۰=۱.۶۲–۱۲.۵۸ mg L-۱). As the primary source of the pathogen inoculum is casing soil and insects, stringent environmental hygiene of the mushroom houses will play a very important role in preventing and controlling the disease.

Agaricus bisporus, Dry bubble, Fungicide resistance, Mushroom, Sporgon.‎