Efficacy of some promising plant essential oils to control the red palm weevil Rhynchophorus ferrugineus olivier (coleoptera: curculionidae) under laboratory conditions

Abstract

Red Palm Weevil is the most dangerous palm pest in Egypt and the Middle East. This study was conducted to evaluate some plants essential oils for use in the control of this pest in egg and larval stages. five individual different oils (orange oil, lemon oil , eucalyptus oil , castor oil, and basil oil)and three mixtures of (chilli+ thyme + lavender =)k1, mixture of (Colocynth and neem) = k2,and mixture of (Radicchio + turmeric +Silene) = k3 with 5 concentrations of 1%, 3%, 5%, 7% and 9% for each one was used as aqueous solutions. Each concertation contains three replicates with ten eggs or larva for each replicate. The eggs were sprayed with different solutions while the larvae were fed on the sugar cane pieces after being dipped in the solutions for 20 seconds. The results of statistical analysis showed superiority the plant oils from orange and lemon showed remarkable mortality (p≤ 0.05) in the number of dead larvae and non-hatched eggs followed by eucalyptus, basil and Castor while other treatments recorded low number of mortalities of larvae and non-hatched eggs. The L.S. D values (2.49 ,6.19) for eggs and larvae respectively, showed that there were significant differences between oils and significant differences between concentrations. orange and lemon oil showed the strongest effect at 9% followed by the other concentrations, while k1 and k2 oil had no significant difference with the control at 1%. The study showed that orange and lemon oils as well as eucalyptus, basil and castor can be used in the control of this pest in the stage of the egg and larva.

Toxicity Bioassays of Essential Oils against Hadda Beetle <i>Henosepilachna vigintioctopunctata</i> (F)

“…Their accumulation leads to the disruption of the cell wall, leakage of the cellular contents and perturbation of homeostasis (Lambert et al, 2001;Juven et al, 1994). It may also affect different targets including γ-aminobutyric acid-gated chloride channels, octopamine receptors, tyramine receptors, acetylcholine esterase, nicotinic acetylcholine receptors, and sodium channels (Tong and Coats, 2010;Ali et al, 2019).…”

Prevalence of Antibiotic Resistant Genes in Staphylococcus aureus Isolated from Bovine Mastitis

“…Five PEO (orange, lemon, eucalyptus, castor, and basil oil) and three mixtures K1 (chilli, thyme and lavender), K2 (Colocynth and neem), and K3 (Radicchio, turmeric and Silene) with 5 concentrations of 1, 3, 5, 7 and 9% of each one was used in 3 replicates with ten eggs or larva. The five PEOs shown significant toxicity against eggs and larvae stages, which portrays it as ecofriendly pesticides for the IPM program (Ali et al, 2019).…”

Disruption impact of citronella and menthol insecticides on adults behavior and hemocytes morphology in the red palm weevil Rhynchophorus ferrugineus “Oliver” (Coleoptera: Curculionidae)

“…10,11 Terpenes are ideal prospects for the production of eco-friendly insecticides due to their documented toxicity against several insect pests such as mosquitoes, houseflies, beetles, and butterflies. [12][13][14][15] Pests have sensory receptors that allow them to discriminate between different host plants and their fundamental chemical components, such as carbohydrates, amino acids, and salts, [16][17][18] as well as secondary botanical compounds that influence whether the substance is appealing 19,20 or repulsive. 21 Chemoreceptors are a group of sensory receptors that include olfaction, taste, and touch and are studied and identified in pests.…”

“…18,[22][23] The development of new eco-friendly and effective methods and materials aimed at managing this pest is urgent and necessary to reduce dependence on hazardous chemical pesticides and maintain the natural balance and beneficial organisms as well as the preservation of human health. 13 In weevils, their egg-laying behavior is limited to the chemical sensory response of olfaction and contact. 24 Fenemore 25,26 has argued that the weevil chooses its host plants for feeding and laying eggs based on the natural features of the plant, such as its surface texture, in addition to those chemical agents the weevil can identify by its olfactory sensory receptors.…”

“…The development of new eco-friendly and effective methods and materials aimed at managing this pest is urgent and necessary to reduce dependence on hazardous chemical pesticides and maintain the natural balance and beneficial organisms as well as the preservation of human health. 13 …”