Chemical composition of Eucalyptus spp. essential oils and their insecticidal effects on Lutzomyia longipalpis

Abstract

The chemical composition of essential oils from three species of plants belonging to the Eucalyptus genus was determined and, their insecticidal effects on egg, larva and adult phases of Lutzomyia longipalpis were assessed. The insects were collected in the municipality of Sobral in the State of Ceará, Brazil. Five treatments with different concentrations were performed along with two negative controls, distilled water and Tween 80 (3%), and a positive control, cypermethrin (0.196mg/ml). The tests were carried out in plastic pots internally coated with sterile plaster and filled with a substrate made of rabbit feces and crushed cassava leaves. The eggs, larvae and adults were sprayed with the oils. The hatched larvae were counted for 10 consecutive days and observed until pupation. Insect mortality was observed after 24, 48 and 72h. E. staigeriana oil was the most effective on all three phases of the insect, followed by E. citriodora and E. globulus oils, respectively. The major constituents of the oils were Z-citral and alpha-citral (E. staigeriana), citronellal (E. citriodora) and 1,8-cineole (E. globulus). The Eucalyptus essential oils constitute alternative natural products for the control of L. longipalpis since the median effective concentration (EC(50)) values revealed relevant action as compared with other natural products, some of their chemical constituents are already known for their insecticidal activity and these oils are produced in commercial scale in Brazil.

Essential oils as biological alternatives to protect date palm (Phoenix dactylifera L.) against Ectomyelois ceratoniae Zeller (Lepidoptera: Pyralidae)

“…Similar results were obtained with the Eucalyptus sp. oils on eggs, larvae and adults of Lutzomyia longipalpis (Maciel et al, 2010). Our results can explain the effectiveness of essential oils on the three biological stages of E. ceratoniae.…”

1,8-cineole protected human lipoproteins from modification by oxidation and glycation and exhibited serum lipid-lowering and anti-inflammatory activity in zebrafish

“…Furthermore, Younis et al (14) reported that small dense LDL, which is particularly associated with the development of coronary heart disease (CHD), is preferentially glycated in non-diabetic human serum. Cineole is also known as eucalyptol, the major oil component of eucalyptus (15). Although cineole was detected in a hydrophilic extract, it is a water-insoluble and colorless liquid with a camphor-like odor with a spicy and cooling taste (16).…”

CHEMICAL COMPOSITION, ANTIMICROBIAL, ANTIOXIDANT AND CYTOTOXIC ACTIVITIES OF <i>EUCALYPTUS CHAPMANIANA</i> GROWN IN IRAQ

“…Eucalyptol was also found in majority of other species of Eucalyptus, such as E. staigeriana (Gilles et al, 2010), E. globules (Maciel et al, 2010;Tyagi and Malik, 2011) and E. urophylla (Cheng et al, 2009). Nevertheless, the main component in other species of Eucalyptus can be a different compound, such as piperitone (E. dives), (E)-methyl cinnamate (E. olida) (Gilles et al, 2010), α-pinene (E. camaldulensis) (Cheng et al, 2009), limonene (E. staigeriana), β-citronellal (E. citriodora) (Maciel et al, 2010), or p-cymene (E. tereticorni) (Toloza et al, 2006). The chemical composition of essential oil is affected by several factors, such as species, geographical location, harvest time, plant part and isolation method (Cimanga et al, 2002;Penalver et al, 2005;Marzoug et al, 2011).…”