Can volatile sulphides act as fumigant or contact toxicant in cowpea weevil, Callosobruchus maculatus F.?: a comparative analysis

Aswathi Kozhissery, Sreekrishnakumar and Madhurya, Lokesh and Urvashi, Sahu and Subramanian Ezhil, Vendan (2025) Can volatile sulphides act as fumigant or contact toxicant in cowpea weevil, Callosobruchus maculatus F.?: a comparative analysis. Natural Product Research. pp. 1-11.

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Abstract

For understanding the toxic action of volatile sulphides, we have evaluated the insecticidal efficacy of sulphide mixture (diallyldisul- fide, diallylsulfide and diallyltrisulfide) against Callosobruchus macu- latus F. adults by fumigant toxicity (FT) and contact toxicity (CT) bioassays. Further, diffusional characteristics of sulphides inside the treatment vials were analysed by GC-FPD and microstructural impacts on treated beetles were observed using SEM. In the com- parative analysis, maximum level of insecticidal toxicity (0.88 µl/L of LC50), residue persistence (32.28 ppm/adult) and microstructural aberration in beetle elytra was observed in CT compared to FT bio- assay (1.60 µl/L of LC50 and 22.67 ppm/adult of residue). Whereas, the GC-FPD based diffusion analysis indicated even distribution of volatiles inside the vials in both FT and CT bioassays. The study results suggests that volatiles act as fumigant/vapours in both bio- assays with respect to even diffusion and toxicity occurs based on insect–volatile contacts inside the treatment chambers.

Item Type:	Article
Uncontrolled Keywords:	Callosobruchus maculatus F, fumigant toxicity, contact toxicity, phytochemical residues, volatile organic compounds, biofumigant diffusion
Subjects:	600 Technology > 03 Agriculture > 05 Insect/Pest Control
Divisions:	Food Protectants and Infestation Control
Depositing User:	Somashekar K S
Date Deposited:	06 May 2025 11:03
Last Modified:	06 May 2025 11:03
URI:	http://ir.cftri.res.in/id/eprint/19329

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