Harte, Steven ORCID: 0000-0001-9628-7912 , Bray, Daniel, Woolley, Victoria ORCID: 0000-0002-9439-6856 , Stevenson, Philip ORCID: 0000-0002-0736-3619 and Fernandez-Grandon, G. Mandela ORCID: 0000-0002-2993-390X (2023) A combination of biopesticides effective against fall armyworm, Spodoptera frugiperda, and mitigation of their defence mechanisms. In: Innovations in Crop Protection towards Sustainable Agriculture, 18th May, 2023, 14-15 Belgrave Square, London, SW1X 8PS.

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Abstract

Fall armyworm, Spodoptera frugiperda (FAW) is a cosmopolitan crop pest species that has recently become established in sub-Saharan Africa and Southeast Asia. Current FAW control is almost entirely dependent on synthetic pesticides. Biopesticides offer a more sustainable alternative but have limitations. For example, pyrethrum is an effective botanical insecticide with low mammalian toxicity but is highly UV labile resulting in a rapid loss of efficacy in the field. Beauveria bassiana is an entomopathogenic fungus that is more persistent, but there is a time lag of several days before it establishes in the population and leads to effective control. The combination of these biopesticides could mitigate their drawbacks and be a more effective strategy for FAW control. Here we evaluated the efficacy of pyrethrum and B. bassiana as individual treatments and in combination against FAW. A combination of pyrethrum at 100 ppm and B. bassiana at both 1x104 and 1x105 conidia mL-1 caused significantly higher FAW mortality than the control treatment (Tukey’s tests, P<0.05), while neither of the treatments when tested individually at these same concentrations were found to be significantly different from the control. Our data indicate that combining biopesticides could overcome the challenges of persistence, slow knockdown at low application rates and improve the potential of biopesticides for IPM. Furthermore, our data also provide valuable insights into the interactions between the EPF and the FAWs main defence mechanism against such infections.

Item Type:	Conference or Conference Paper (Poster)
Uncontrolled Keywords:	biopesticide; botanicals; Pyrethrum; entomopathogenic fungi
Subjects:	Q Science > Q Science (General) S Agriculture > S Agriculture (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Natural Resources Institute Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department Faculty of Engineering & Science > Natural Resources Institute > Chemical Ecology Research Group
Related URLs:	http://www.soci.org/events/fine-chemical...
Last Modified:	16 Feb 2024 08:26
URI:	http://gala.gre.ac.uk/id/eprint/45708

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