Abstract
The tobacco cutworm, Spodoptera litura (Lepidoptera: Noctuidae) (Fabricius), is a polyphagous pest which has developed physiological resistance against a number of known insecticides. In order to reduce the load of synthetic insecticides, ecofriendly alternative strategies are needed. The present studies were conducted to evaluate the insecticidal potential of the endophytic fungus Cladosporium uredinicola isolated from Tinospora cordifolia (Thunb.) on S. litura. Development of S. litura was significantly prolonged when larvae were fed on diet amended with ethyl acetate extract of C. uredinicola at concentrations of 1.25–2.00 μl g−1. The negative effects of fungal toxin on development of S. litura further resulted in a significant reduction in adult emergence, longevity and reproductive potential at higher concentrations. A significantly higher number of adults showed morphological deformities when larvae were fed on diet amended with 2.00 μl g−1 concentration. The inhibitory effects on growth and development of S. litura indicate toxicity of ethyl acetate extract of C. uredinicola, which is further evidenced by reduced food utilization by larvae. The antifeedant and toxic effects of ethyl acetate extract of C. uredinicola observed in the present studies can be attributed to a bioactive compound produced by the fungus, so this study provides evidence that C. uredinicola isolated from T. cordifolia possesses anti-insect properties and may play an important role in protecting plants against insect pests.
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Financial assistance from University Grants Commission (UGC), Government of India, New Delhi, is duly acknowledged.
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Thakur, A., Singh, V., Kaur, A. et al. Insecticidal potential of an endophytic fungus, Cladosporium uredinicola, against Spodoptera litura . Phytoparasitica 41, 373–382 (2013). https://doi.org/10.1007/s12600-013-0298-9
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DOI: https://doi.org/10.1007/s12600-013-0298-9