Combined Effects of Bio Control Agents and Residues on Root Rot Mortality in Indian Mesquite (Prosopis cineraria)
2010
Lodha, S. | Harsh, L.N.
Indian mesquite (Prosopis cineraria) is the most important tree species forming an integral part of agro-forestry ecosystems of Indian arid regions. It is considered as lifeline of desert dwellers due to its multiple uses as an alternative source of livelihood particularly during the period of droughts. In recent years, large scale mortality in this tree due to an insect-disease association was observed in many pockets of the region. Attack of Acanthophorus serraticomis predisposes trees to infection by a root invading pathogen Ganoderma lucidum. In the present study, a practical management strategy was developed against Ganoderma, which can be easily implemented by resource deficient farmers of the region. In laboratory, effectiveness of bio control agents and residues of on farm wastes was tested on Ganoderma colonized bits in the soil. Maximum reduction in viable colonized bits was recorded in onion and cauliflower residue amended soil, which also encouraged multiplication of a native strain of Aspergillus terreus effective against Ganoderma. In field demonstrations, significant improvement in the canopy growth of trees amended with A. terreus and onion residues was recorded. A. terreus is a heat tolerant strain, which can withstand high soil temperatures (50-55°C) prevalent during summer months in the region. Our studies demonstrate potentials of utilizing these residues in combination with native bio control agents for managing Ganoderma induced root rot mortality in important tree species of Indian arid region.
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