Abstract
The present study explores the insect toxicity and antifungal activity of 2, 3-dimethylmaleic anhydride against mixed-age cultures of several stored product insects namely: the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae); the pulse beetle, Callosobruchus chinensis Fab (Coleoptera: Bruchidae) and the rust-red flour beetle, Tribolium castaneum Herbst (Coleoptera: Tenebrionidae) and plant fungal pathogens namely: Fusarium oxysporum f. sp. cepa (Hypocreales:Nectriaceae) and Sclerotium oryzae Cattaneo (Magnaporthales: Magnaporthaceae), respectively. The study also revealed that the mixed-age-cultures of C. chinensis were slightly tolerant to 2, 3-dimethylmaleic anhydride, showing 80–90% mortality in 72-h exposure at 100 µg/L dose only. Whereas mixed-age-population of S. oryzae and T. castaneum were fairly susceptible, attaining 100% population extinction at 100 µg/L doses of 2, 3-dimethylmaleic anhydride in 24, 48 or 72 h of exposure. Further, the isolated compound also inhibits mycelia growth of the two filamentous fungi under study at 5 mg/plate and inhibition was dose-dependent and species-specific. This is first to report showing the antifungal activities of 2, 3-dimethylmaleic anhydride. Finally, results reveal that 2, 3-dimethylmaleic anhydride could be potential biopesticides for plant fungal pathogens and stored product beetles.
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Acknowledgements
We thank the Director, Institute of Bioresources and Sustainable Development, Imphal, for both manpower and instrumentation supporting this study and we also thank Dr. S. Indira Devi, Scientist, Institute of Bioresources and Sustainable Development, Imphal, for the supply of fungal pathogens. The authors acknowledge the financial support by the Department of Biotechnology (DBT), New Delhi, India, through extramural twinning Grant No. BT/428/NE/TBP/2013.
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Devi, T.B., Mayanglambam, S., Chanu, H.D. et al. Toxicity and antifungal activity of 2, 3-dimethylmaleic anhydride against stored product beetles and plant fungal pathogens. J Plant Dis Prot 125, 585–590 (2018). https://doi.org/10.1007/s41348-018-0181-5
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DOI: https://doi.org/10.1007/s41348-018-0181-5