Efficacy of sterilized culture filtrate of Trichoderma harzianum Rifai against mango wilt pathogen, Ceratocystis fimbriata Ellis and Halst

Mango wilt disease caused by Ceratocystis fimbriata has become a serious constraint in most mango growing areas in Uttar Pradesh and in several states in India. Management of mango wilt has been achieved by the application of cultural practices and the foliar and soil application of fungicides. In this study, the sterilized culture filtrate of TH-12 was also evaluated for their efficacy against C. fimbriata through food poison technique under laboratory conditions. All the concentrations of culture filtrate of TH-12 were found effective up to 20 days but no difference in growth of control and 0.15 per cent concentration was recorded at 30^th day after inoculation. The maximum suppression of C. fimbriata was found at 10 per cent concentration on 30^th day after inoculation. Concentrations of filtrate used in the range from 0.15 to 10 per cent significantly reduced the growth of C. fimbriata in comparison to control. The suppressive potential of the sterilized culture filtrate of TH-12 bio-control agent indicated the possibility of development of bioformulation for the management of mango wilt under field conditions.