| Abstrakt: |
Background: The Spodoptera frugiperda(J. E. Smith) (Lepidoptera: Noctuidae) is a cosmopolitan polyphagous pest that feeds on nearly 80 species of plants The pest can cause upto 100% damage to crops if neglected. It is also resistant to the most of the chemical molecules available in the market, so it is necessary to identify alternate technology to combat this pest. Results: The crude cyanobacterial extracts of hexane, petroleum ether, ethanol and methanol extracts of Spirulinasp. and Nostoc muscorumwere evaluated against second instar larvae of S. frugiperdathrough diet overlay method of bioassay. The results revealed that N. muscorumhexane extract and N. muscorumpetroleum ether extract recorded the lowest LC50value of 49.09 and 61.37 ppm, respectively. This was followed by Spirulinahexane extract, Spirulinapetroleum ether extract, N. muscorumethanol extract, N. muscorummethanol extract, Spirulinaethanol and methanol extract which were recorded 173.16, 227.22, 530, 730, 970 and 1000 ppm, respectively. Further, their potential effects on different biological parameters of S. frugiperda, viz. larval duration, pupal duration, percent pupation, pupal weight, pupal malformation, adult malformation, percent adult emergence, fecundity, and male and female adult longevity, were studied. The significant effects on different biological parameters were recorded by N. muscorumhexane and petroleum ether extract, followed by Spirulinahexane and petroleum ether extract. Similarly, an experiment was repeated for the confirmation of the first set of results, which followed by a similar trend. The first-ever novel study on S. frugiperdaconcluded that crude extracts of Spirulinasp. and N. muscorumextracts showed significant effects in causing larval mortality and affecting different biological parameters. Conclusions: The experimental results can be recommended as a potential source of natural pesticides for the control of S. frugiperda. |
Full text from SpringerLink