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Persistence and ingestion characteristics of phytochemical volatiles as bio-fumigants in Sitophilus oryzae adults.

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Relation http://ir.cftri.com/14788/
https://doi.org/10.1016/j.ecoenv.2020.111877
 
Title Persistence and ingestion characteristics of phytochemical volatiles as
bio-fumigants in Sitophilus oryzae adults.
 
Creator Urvashi, Sahu
Ibrahim, S. S.
Ezhilvendan, S.
 
Subject 10 Plants
05 Insect/Pest Control
 
Description Fumigant toxicity of phytochemical volatiles has been widely reported against stored product insect pests. Such
volatiles are considered as natural fumigants and bio-fumigants in post-harvest food protection research. In the
present study, persistence and ingestion of diallyl disulfide, citral, eucalyptol, eugenol and menthol were
investigated in Sitophilus oryzae adults in comparison with fumigant toxicity and microstructural impact in elytra.
The fumigant toxicity bioassay was performed with increasing concentrations of phytochemical volatiles at 25,
125, 250 and 500 μL/L air against S. oryzae adults in 50 mL glass vials. The phytochemical residues were
examined from the treated adults by Gas Chromatography coupled with Flame Ionization Detector (GC-FID) and
their pathological impacts on the elytral surface was observed under Scanning Electron Microscopy (SEM). After
72 h of fumigation, diallyl disulfide and eucalyptol were identified as potential fumigants with 5.24 and 8.30 μL/
L air LC50 values, respectively. GC-FID analyses showed that diallyl disulfide and eucalyptol molecules persistence (1.29 and 2.60 ppb persistence with 0.94 and 0.90 r
2 values respectively at 72 h exposure) on the body
surface of weevil was positively correlated with the fumigation exposure and toxicity. Whereas, phytochemical
molecules ingestion into the body of weevils was not directly linked with the insect mortalities. The SEM observations indicated that diallyl disulfide and eucalyptol molecules caused severe microstructural impacts on the
elytra of weevils compared to other molecules. As a result, the present study suggested that phytochemical fumigants are persisted on the body surface and caused insecticidal toxicities in S. oryzae adults. In addition, it was
predicted that persisted molecules might be entered into the body of weevils via cuticular penetration.
 
Date 2021
 
Type Article
PeerReviewed
 
Format pdf
 
Language en
 
Identifier http://ir.cftri.com/14788/1/Ecotoxicology%20and%20Environmental%20Safety%20210%20%282021%29%20111877.pdf
Urvashi, Sahu and Ibrahim, S. S. and Ezhilvendan, S. (2021) Persistence and ingestion characteristics of phytochemical volatiles as bio-fumigants in Sitophilus oryzae adults. Ecotoxicology and Environmental Safety, 210. p. 111877.