Analysis of the Essential Oils of Eucalyptus camaldulensis Dehnh. and E. viminalis Labill. as a Contribution to Fortify Their Insecticidal Application

Abstract

The use of synthetic chemicals, with harmful effects on the environment and human health, is the principal strategy in the management of stored-product insect pests such as Oryzaephilus surinamensis and Sitophilus oryzae. Various studies in recent years have highlighted the possibility of using plant essential oils as available and low-risk factors in insect pest management. Therefore, in the present study, the possibility of controlling O. surinamensis and S. oryzae was investigated using Eucalyptus camaldulensis and Eucalyptus viminalis leaf essential oils. The essential oils were obtained by hydrodistillation of the leaves of the 2 Eucalyptus species, and the chemical compositions were determined by gas chromatographic-mass spectral analysis. The essential oil of E. camaldulensis was dominated by p-cymene (24.8%), cryptone (18.9%), and spathulenol (12.4%), while the major components in E. viminalis essential oil were 1,8-cineole (51.6%) and α-pinene (15.8%). The essential oils displayed promising fumigant toxicity against insect pests, which was positively dependent on utilized concentrations and exposure times. Oryzaephilus surinamensis, with low median lethal concentrations, was more susceptible than S. oryzae to the essential oils after 24, 48, and 72 hours. Also, E. viminalis essential oil, with a high level of insecticidal monoterpenes such as 1,8-cineole and α-pinene, was more toxic to insect pests than E. camaldulensis oil. According to the results of the current study, E. camaldulensis and E. viminalis essential oils, rich in insecticidal terpenes, can be alternative candidates to synthetic chemicals in the management of O. surinamensis and S. oryzae.

Insecticidal Potential of Some Selected Phytoextracts against Mealybug Drosicha mangiferae (Hemiptera: Pseudococcidae) Infesting Citrus Plants in Sargodha

“…Further, E. camaldulensis have also good insecticidal properties and have been used to control diverse species of insect pests (Hamdi et al, 2015;Andrade-Ochoa et al, 2018). Ebadollahi and Setzer (2020) reported that the essential oil of E. camaldulensis is very effective to control Oryzaephilus surinamensis (Coleoptera: Silvanidae) and Sitophilus oryzae (Coleoptera: Curculionidae) due to the presence of an insecticidal component known as terpenes. Similarly, Izakmehri et al (2013) concluded that E. camaldulensis can be considered as a component of integrated management of Callosobruchus maculatus F. (Coleoptera: Bruchidae) in storage system.…”

Chemical analysis of Eucalyptus and Rosemary essential oils using gas chromatography-mass spectrometry (GC-MS) and evaluation of their toxicity against teh most common urban pest

“…It has been found to have insecticidal properties agains t various insects, including mosquitoes, flies, and cockroaches. Its mode of action is thought to be disrupting the insects' nervous sys tem, leading to paralysis and death [12][13][14][15][16][17][18][19][20]28]. α-pinene is a monoterpene that is commonly found in essential oils of pine trees, as well as in other plants such as rosemary and eucalyptus.…”

“…Eucalyptus spp., a genus belonging to the Myrtaceae family, has more than 800 different species, and although it originates from the continent of Aus tralia, it has been grown in many tropical and subtropical regions due to its high adaptability and rapid growth for obtaining wood, gum, cellulose, and essential oils. Essential oils and extracts isolated from the aerial parts of this plant have been used in traditional medicine [13]. The use of essential oils as plant-based pes ticides has numerous advantages.…”

Promising Insecticidal Efficiency of Essential Oils Isolated from Four Cultivated Eucalyptus Species in Iran against the Lesser Grain Borer, Rhyzopertha dominica (F.)

“…The essential oil is considered to be the main product of Eucalyptus trees, which are widely used in the food and perfume industries and medicine [ 19 ]. Terpenes such as 1,8-cineole, cryptone, p -cymene, α-pinene, α-terpineol, limonene, and spathulenol are commonly found as the main components of Eucalyptus essential oils [ 20 , 21 , 22 ]. The insecticidal properties of essential oils isolated from several Eucalyptus species were demonstrated against coleopteran insect pests, even on R. dominica , which was mainly dependent on the presence of terpene compounds [ 23 ].…”