Evaluation of biocontrol agents for the management of root-rot of mung bean caused by Macrophomina phaseolina
Present study was undertaken to evaluate the effectiveness of various biocontrol agents through seed treatment against root-rot of mung bean caused by Macrophomina phaseolina under pot condition. Maximum control of the disease was observed on treatment with T. viride (46.7%) and P. aeruginosa (44.4%) which improved the yield parameters by 28.6 and 25.9%; and functional nodules by 51.9–57.0% with 22.4–22.9% greater leghemoglobin content in the nodules (P < 0.05). Their treatment also improved the leaf chlorophylls (30.2–35.8%) and carotenoids (31.3–32.0%). Soil population of M. phaseolina in the pots treated with antagonists was 40.8–67.3% lesser, being greatest with T. viride and P. aeruginosa.
The root-rot disease caused by Macrophomina phaseolina significantly reduced the grain yield of mung bean by 36%.
The biocontrol agents checked the root-rot severity by 31–47%.
Trichoderma viride was the most effective with 47% disease decline and 29% yield increase.
Pseudomonas aeruginosa checked the disease (44%) and improved the yield (26%) of mungbean.
Soil population of the biocontrol agents increased considerably, but of pathogens declined.
KeywordsManagement Macrophomina phaseolina Pseudomonas aeruginosa Root-rot disease Trichoderma spp.
The financial support provided by the Department of Science and Technology (DST), New Delhi during the present study is greatly acknowledged.
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