Fumigant toxicity of eugenol and its negative effects on biological development of Callosobruchus maculatus L

Abstract

The protection of stored products from insect damages, when accomplished, is mostly relying on the application of synthetic insecticides with serious health and environmental issues in addition to risks of selection of resistant insect populations associated with such practice. The use of plants derived compounds have been presented as sound strategy for sustainable insect pest management. Eugenol is an aromatic component of natural occurrence in essential oils of numerous plants. known for its repellent and insecticidal bioactivities against different insect species. Here, we investigated the fumigant application of eugenol to control the cowpea weevil Callosobruchus maculatus (Coleoptera: Chrysomelidae: Bruchinae) by assessing toxicity, effects on biological development (including emergence inhibition) and repellency to these weevil. Besides a good fumigant insecticidal activity, eugenol exposure resulted in a dose-dependent decrease of the growth rate of C. maculatus associated with a steady reduction in bean mass losses. Additionally, inhibition of offspring was upper 50% when adults were exposed to lethal and sublethal concentrations. significant inhibition of the offspring emergence was achieved after the exposure of parental adults to lethal and sublethal doses of eugenol. Furthermore, adult weevils were repelled away from beans exposed to high dose (LD99) of eugenol in contrast with their attraction to the beans treated with lower dose (LD50). Our findings suggest that eugenol has potential as control tool to be used in sustainable management startegies of C. maculatus.

Insecticidal effects of substances from cinnamon bark – eugenol, trans-cinnamaldehyde and cinnamaldehyde to yellow mealworm

“…Coleoptera: Chrysomelidae) in the fumigant test, with LC 50 value close to the one we obtained in the lter paper tests(González et al 2019). Also, the results ofMartínez et al (2018) measurement of the lethal time gave similar results of 50% lethality, as our LT 50 values, although the nal mortality (i.e., close to 100%) was obtained faster than in our experiment.…”

Toxicological and Histological Evaluation of Insecticides and Essential oils in Nano emulsion and formulated Form against Spodoptera littoralis

“…Previous studies have shown that the insecticidal efficacy of peppermint oil Heydari et al, (2020). Eugenol has been proven effective in controlling a wide range of pests such as Aedes aegypti (Adhikari et al, 2022), Musca domestica (Silva et al, 2020), Callosobruchus maculatus (González et al, 2019). Two nano forms have highly significant effect than the traditional forms.…”

Rethinking biorational insecticides for pest management: unintended effects and consequences

“…However, as already addressed in the present investigation, neglecting the unintended effects of biorational insecticides can represent a serious flaw for these insect management tools. Indeed, insects exposed to sublethal doses of biorational insecticides can change their physiology or behavior in a way that can increase or compromise the efficacy of these management tools. This implication should be seriously considered.…”