Researchers tested two special bacteria strains (Bacillus subtilis B-10 and M-22) to protect white button mushrooms from wet bubble disease, a serious fungal infection that can destroy entire crops. When applied to mushroom growing beds, both bacteria effectively prevented the disease-causing fungus from developing, with success rates between 50-99% depending on application method. This offers mushroom farmers a natural, chemical-free alternative to synthetic fungicides for protecting their crops.