CHEMICAL COMPOSITION AND TOXICITY OF CITRUS ESSENTIAL OILS ON Dysmicoccus brevipes (HEMIPTERA: PSEUDOCOCCIDAE)

LUIS MOREIRA DE ARAUJO JUNIOR,ADILSON VIDAL COSTA,GISELE DOS SANTOS OLIVEIRA MARTINS,JOSÉ ROMÁRIO DE CARVALHO,HUGO BOLSONI ZAGO

doi:10.1590/1983-21252017v30n330rc

LUIS MOREIRA DE ARAUJO JUNIOR, ADILSON VIDAL COSTA + Show 3 more

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https://doi.org/10.1590/1983-21252017v30n330rc

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Journal: Revista Caatinga	Publication Date: Sep 1, 2017
Citations: 17	License type: cc-by

Affiliation: Universidade Federal do Espírito Santo

Abstract

ABSTRACT The insect Dysmicoccus brevipes (Hemiptera: Pseudococcidae) has been reported as an important pest for several crops, especially coffee. The citrus essential oils can be obtained as by-products of the citrus-processing industry and have been tested as an alternative to control different insect groups. Therefore, the objective of this work was to determine the chemical composition and evaluate the toxicity of commercial sweet orange (Citrus sinensis), bitter orange (Citrus aurantium) and Sicilian lemon (Citrus limon) essential oils and pure monoterpene D-limonene on D. brevipes. The essential oils were analyzed by gas chromatography. Two bioassays were conducted; the first assessing the insect mortality in all oils and the second assessing the lethal concentrations (LC50 and LC95) of the most effective oils. The main components of the oils were D-limonene (83.33%) and Linalool (8.91%) (sweet orange); D-limonene (78.53%) and γ-terpinene (12.65%) (bitter orange); D-limonene (59.78%), beta-pinene (14.71%) and γ-terpinene (10.19%) (Sicilian lemon) and the compound D-limonene had 97% of purity. The highest mortalities were found with the use of the Sicilian lemon (98.68%) and sweet orange (94.11%)oils. The sweet orange oil presented lethal concentrations at 2.21% (LC50) and 3.55% (LC95), and the Sicilian lemon oil at 0.72% (LC50) and 2.91% (LC95). The main component of the sweet orange and Sicilian lemon essential oils was the D-limonene, and the Sicilian lemon oil was most effective oil to control D. brevipes.

Highlights

MATERIAL AND METHODSCochineals (Hemiptera: Coccoidea) constitute one of the main groups of insect pests in various production systems, and may infest cultivated and wild plants (SANTA-CECÍLIA, 2005)
The sweet orange and Sicilian lemon essential oils promoted the highest mortality rates, they were subjected to concentration-mortality curves (LC50 and CL95) in Bioassay II
The bitter orange essential oil presented the lowest mortality rate, which did not differ from the pure D-limonene (Table 2)

Summary

Introduction

MATERIAL AND METHODSCochineals (Hemiptera: Coccoidea) constitute one of the main groups of insect pests in various production systems, and may infest cultivated and wild plants (SANTA-CECÍLIA, 2005). The objective of this work was to determine the chemical composition and evaluate the toxicity of commercial sweet orange (Citrus sinensis), bitter orange (Citrus aurantium) and Sicilian lemon (Citrus limon) essential oils and pure monoterpene D-limonene on D. brevipes. In Bioassay I, the sweet orange, bitter orange, Sicilian lemon and pure D-limonene solutions were used at concentrations of 10% (v v-1) to identify the most toxic products.

Objectives

Results

Conclusion