It is studied that the activity against eumycetes of the fermentation filtrate ( 16h ) of strain jw - 725 is the strongest . the optimum nutritional sources are wheat bran and soya bean meal . the fermentation filtrate reserved under 4 still has bioactivity after 20 days or so , but its bioactivity decreases much while being treated under high temperature . the ph of fermentation filtrate has much influence upon the bioactive substance , and it remains activity at the range of 5 发酵液在4下保存20天左右仍有抗菌活性；但经高温处理后，其抗菌活性降低很多； ph对抑菌物质的生物活性影响比较大，抑菌物质保持活性的ph范围是5 . 0 7 . 0 。分离到的多粘芽孢杆菌( b polymyxajw - 725 )对柑橘青霉菌( p
