Insecticide activity of clove essential oil on bean weevil and maize weevil

Abstract

A B S T R A C TBean weevil and maize weevil can cause considerable damage to stored grains. These insects are mainly controlled with synthetic chemical insecticides, which may bring serious problems to human and environmental health. Therefore, this study aimed to evaluate the efficiency of the essential oil of clove [Syzygium aromaticum (L.) Merrill & Perry (Myrtaceae) (origin: Bahia, season Sep.2014-Feb.2015] in the control of S. zeamais and A. obtectus under laboratory conditions. The essential oil was extracted through the classic hydrodistillation process and its chemical components were identified via gas chromatography. Oil efficiency was tested at the doses of 35, 17.9, 8.9, 3.6, 1.8, 0.4 and 0.2 µL g -1 (derived from a pilot study) for insect control and the LC 50 was determined. The results showed that eugenol was the major compound. The essential oil caused mortality of 100% for both species 48 h after treatment with the concentrations of 17.9 and 35 µL g Atividade inseticida do óleo essencial de cravo-da-índia sobre o caruncho-do-feijão e o gorgulho-do-milho R E S U M OO caruncho-do-feijão e o gorgulho do milho podem causar grandes prejuízos aos grãos armazenados. Entre as alternativas de controle está a utilização de óleos essenciais de plantas com propriedades inseticidas; objetivou-se, assim, avaliar a eficiência do óleo essencial de cravo-da-índia no controle de S. zeamais e A. obtectus em condições de laboratório. O óleo essencial foi extraído por processo clássico de hidrodestilação e seus constituintes químicos foram identificados por cromatografia gasosa. A eficiência deste óleo foi testada nas doses 35; 17,9; 8,9; 3,6; 1,8; 0,4 . A CL 50 para A. obtectus foi 9,45 µL g -1 contra 10,15 µL g -1 do S. zeamais. A utilização do óleo essencial de cravo-da-índia representa uma alternativa promissora a ser usada em condições de armazenagem para o manejo integrado de pragas de grãos armazenados.

Acaricidal activity of essential oil of Syzygium aromaticum, hydrolate and eugenol formulated or free on larvae and engorged females of Rhipicephalus microplus

“…The relative percentages of components were calculated based on the total quantity of the four major components because other compounds were also present, although not in significant proportions. Despite all the factors that may interfere in the chemical composition of an essential oil, the present results corroborate the findings of other research studies carried out on clove essential oil that showed the major constituent in this oil to be eugenol (Silvestri et al ., ; Mello et al ., ; Jairoce et al ., ).…”

Etapas da construção científica: da curiosidade acadêmica à publicação dos resultados

“…A CL50 para A. obtectus foi 9,45 μL g-1 contra 10,15 μL g-1 do S. zeamais. A utilização do óleo essencial de cravo-da-índia representa uma alternativa promissora a ser usada em condições de armazenagem para o manejo integrado de pragas de grãos armazenados (JAIROCE et al, 2016).…”

Medium-Chain Fatty Acids from Eugenia winzerlingii Leaves Causing Insect Settling Deterrent, Nematicidal, and Phytotoxic Effects

“…However, studies focusing on the effects of extracts or metabolites on plant pests are scarce [27,28]. The toxicity of essential oils and organic extracts of Eugenia caryophyllata leaves has been reported in the human ectoparasite Pediculus capitis [29], the mosquito Aedes aegypti [30], the stored grain pests Acanthoscelides obtectus , Sitophilus zeamais , and Tribolium castaneum [31,32] and the plant feeders Oryctes agamemnon , Pochazia shantungensis , and Trialeurodes vaporariorum [33,34,35], and in the nematodes Bursaphelenchus xylophilus and Meloidogyne incognita [36]. In addition, essential oils from Eugenia uniflora have shown strong repellent effects on Diaphania hyalinata [37].…”