The total production has steadily increased from approximately 186,400 M/T in 2007 to 198,563 M/T in 2009. Winter mushroom, Flammulina velutipes, with 61,057913 M/T in 2009, showed the highest production. Several bacteria are known as the causal agents of diseases of the cultivated button mushroom (Agaricus bisporus) and oyster mushroom (Pleurotus ostreatus). Pseudomonas tolaasii is the causal agent of brown blotch disease of commercial mushrooms. Antagonists against P. tolaasii, HC5 were selected and their control efficacy of brown blotch disease was investigated in this study. After proceeding antagonistic test, HC5 was selected as a strong antagonist against P. tolaasii and the HC5 strain was identified as P. azotoformans with the cultural, physiological and biochemical properties and analysis of the 16S rRNA. Control efficacy of brown blotch disease by HC5 treatment was 73% on Agaricus bisporus, 78% on Flammulina velutipes and 71% on pleurotus ostreatus respectively.

• Hye-Su Han(Heuksalim, Cheongwon-gun, Chungbuk, 363-885, Korea)
• Young-Mi Yoo( Mushroom Research Division, NIHHS, RDA, Suwon 441-707, Korea) | Young-Mi Yoo
• Chang-Sung Jhune( Mushroom Research Division, NIHHS, RDA, Suwon 441-707, Korea) | Chang-Sung Jhune
• Jong-Chun Cheong( Mushroom Research Division, NIHHS, RDA, Suwon 441-707, Korea) | Jong-Chun Cheong
• Won-Sik Kong( Mushroom Research Division, NIHHS, RDA, Suwon 441-707, Korea) | Won-Sik Kong
• Jae-Soon Cha( Department of Plant Medicine, Chungbuk National University, Cheongju 361-763, Korea) | Jae-Soon Cha
• Chan-Jung Lee( Mushroom Research Division, NIHHS, RDA, Suwon 441-707, Korea) | Chan-Jung Lee