Abstract
Indiscriminate use of synthetic pesticides by the brinjal growers in Assam has become a threat to biodiversity and consumer health. To find out the organic solution for managing brinjal pests, the efficacy of two entomopathogenic fungi (@1X108 spores/ml of water) was tested against naturally infested brinjal pests. The results revealed that Metarhizium anisopliae was more efficient in reducing the population of sucking pests like aphids (64.87%), jassids (57.74%), and white flies (63.80%). Meanwhile, Beauveria bassiana was found to be more effective against hadda beetle, reducing the population by 67.16% and also superior in reducing brinjal shoot and fruit borer infestations (percentage of shoot infestation = 9.34, percentage of fruit infestation by number = 11.73 and percentage of fruit infestation by weight = 14.32). Based on our earlier experimental result of dual culture assays against brinjal pathogens and compatibility tests among the biocontrol agents, a liquid consortial formulation with three best compatible biocontrol agents namely, Trichoderma harzianum, B. bassiana and M. anisopliae was prepared. A further field experiment was conducted at Assam Agricultural University, Jorhat and Krishi Vigyan Kendra, Barpeta, Assam to test the efficacy of six different Integrated Pests and Disease Management (IPDM) modules with the prepared consortia. The study showed that module-6 (seed treatment + seed bed treatment in nursery + soil application in main field + seedling dip treatment with consortia of biofertilizer, Rhizobium sp, Azotobacter sp strain 52, Azospirillum sp strain 71 and Bacillus sp strain 5 W + spraying of consortia) was the best for managing pests (aphid, jassid, hadda beetle and brinjal shoot and fruit borer) of brinjal.
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Acknowledgements
We acknowledge the help, guidance received from Director of Post Graduate Studies, Director of Research (Agri) and Director of Extension of Education, Assam Agricultural University, Jorhat, Assam during the course of the study. We are also thankful to Dr. D. J. Nath, AAU, Jorhat, Assam for providing the biofertilizer strains.
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Upamanya, G., Dutta, P. & Bhattacharyya, A. Biointensive management of pests of brinjal with consortia of entomopathogenic fungi, fungal antagonists and biofertilizer in the agro-ecological conditions of Assam. Int J Trop Insect Sci 43, 1757–1770 (2023). https://doi.org/10.1007/s42690-023-01083-7
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DOI: https://doi.org/10.1007/s42690-023-01083-7