Mise au point d' un biofongicide a base de talc utilisant Trichoderma harzianum et son effet sur la maladie du pourrissement de la racine du murier.
2000
Philip T. | Sharma D.D. | Govindaiah
Root rot disease of mulberry caused by Fusarium solani and F. oxysporum is a major problem in many sericultural areas of India. The disease causes sudden leaf withering, defoliation and death of plants. Efforts have been made to control the disease biologically. The efficacy of a bioformulation of Trichoderma harzianum grown on potato-yeast-sugar media and delivered into soil through talc as the base material, against the disease, the survival of pathogens and the biocontrol agent in the soil and the shelf life of the bioformulation have been investigated. In the talc based bioformulation, there was 40 and 110.10(6) colony forming units/gram after 90 days of storage at room temperature and in a refrigerator (4 degrees C) respectively. In the field the bioformulation helped to reduce the population of F. solani and F. oxysporum by about 85/ and it has controlled the disease by about 75/. There was no significant reduction in the efficiency of the bioformulation to control the disease even after 90 days of storage at room temperature. The efficacy of the product can be attributed to the rhizosphere competence of Trichoderma which is known to produce active metabolites such as lytic enzymes, chitinase, glucanase, harziadinole and an antibiotic "trichodermin", which kill many soil pathogens.
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