Terpenoid constituents of cinnamon and clove essential oils cause toxic effects and behavior repellency response on granary weevil, Sitophilus granarius

Abstract

This study evaluated toxic effects, repellency and respiration rate caused by terpenoid constituents of cinnamon and clove essential oils and against Sitophilus granarius L. (Coleoptera: Curculionidae). The lethal concentrations (LC and LC), repellent effect, and behavior repellency response on adults of S. granarius after exposure to six concentrations of each essential oil and terpenoids were evaluated. The chemical composition of the cinnamon oil was also determined and primary compounds were eugenol (10.5%), trans-3-caren-2-ol (10.2%), benzyl benzoate (9.99%), caryophyllene (9.34%), eugenyl acetate (7.71%), α-phellandrene (7.41%), and α-pinene (7.14%). In clove essential oil, the primary compounds were eugenol (27.1%), caryophyllene (24.5%), caryophyllene oxide (18.3%), 2-propenoic acid (12.2%), α-humulene (10.8%), γ-cadinene (5.01%), and humulene oxide (4.84%). Cinnamon and clove essential oil was toxic to S. granarius. In toxic terpenoids compounds, eugenol has stronger contact toxicity in S. granarius than caryophyllene oxide, followed by α-pinene, α-humulene, and α-phellandrene. Insects reduced their respiratory rates after being exposed to essential oil terpenoids and avoided or reduced their mobility on terpenoid-treated surfaces. Cinnamon and clove essential oil, and their terpenoid constituents were toxic and repellent to adult S. granarius and, therefore, have the potential to prevent or retard the development of insecticide resistance.

Exposure to cyantraniliprole causes mortality and disturbs behavioral and respiratory responses in the coffee berry borer (Hypothenemus hampei)

“…Various insect pests show altered behavioral responses when exposed to insecticides; insects are reported to leave toxic environments as soon as they detect toxic compounds . Studies show that synthetic insecticides can disrupt recognition of the host substrate, influencing the olfactory orientation and walking behavior of insects . Volatile insecticides may enter insects through the spiracles and tracheae during respiration .…”

“…Cyantraniliprole negatively affected the respiration rate of H. hampei indicating physiological stress caused by the insecticide. Similar results have been reported for other insects exposed to insecticides . This decrease would be linked to the decrease in their behavioral response and locomotor activity.…”

Efficacy of some Essential Oils on Cowpea Aphid, Aphis craccivora Koch (Hemiptera: Aphididae)

“…In addition, secreting of honeydew by this insect pest provides a medium for the growth of black sooty mold which cover on leaves resulting impair photosynthesis and causing more damage to the plant (Cranshaw et al, 2000) In order to avoid the many problems resulting from the use of traditional pesticides, including development of insecticide resistant population the interest in finding other products of effective natural alternatives in pest control is necessary. This is reflected in the continuing interest in studying the impact of the use of essential oils as pesticides for the last period where, it was found to possess many repellent and toxic capacities for various pests which show potential to control it including aphids (Gupta and Dikshit, 2010;Barkman, 2013 andPlata-Rueda et al, 2018).…”

Phytochemical Characterization and Chemotherapeutic Potential of Cinnamomum verum Extracts on the Multiplication of Protozoan Parasites In Vitro and In Vivo

“…C. verum extracts contain a mixture of polyphenols with cinnamaldehyde that plays a significant therapeutic role in cancer cell lines by depolarization of the mitochondrial membrane potential, leading to cellular apoptosis without cytotoxic activities on host cells [32]. One possible explanation of the modest selectivity index of AECV and EAECV is due to the presence of alkaloids and terpenoids [30,33]. The aforementioned results indicating the safety of C. verum extracts for the treatment of animals and humans following further clinical studies.…”