Acaricidal and repellent activity of the essential oils of Backhousia citriodora, Callistemon viminalis and Cinnamodendron dinisii against Rhipicephalus spp

ABSTRACT The aim of this work was to evaluate the insecticidal and repellency activity of the essential oil of Cinnamomum camphora var. linaloolifera Y. Fujita (Ho-Sho) and Cinnamomumcamphora (L.) J Presl.var. hosyo (Hon-Sho), against the Sitophilus zeamais in maize grains. The essential oils were obtained by hydrodistillation and analyzed by GC-MS.The insecticidal activity was determined by the toxicity of different concentrations of essential oils during 24 hours of contact with the insects, in the absence of feed substrate. The Bioassays of repellency were conducted with lethal doses (LD50,LD25,and LD12.5) obtained from insecticidal bioassay. In order to compare the treatments the preference index (PI) was employed. The analysis of the essential oils of Cinnamomum camphora leaves indicated 68% of camphor and 9% of linalool for the variation Hon-Sho and 95% of linalool to the variation Ho-Sho. The variation Ho-Sho presented greatest insecticidal activity than the variation Hon-Sho against the Sitophiluszeamais, with LD50 of 0.35 μL/cm2, whereas in the variation Hon-Sho the ratewas 0.48 μL/cm2. However, considering only the concentrations of linalool and camphor of Ho-Sho and Hon-Sho, the lethal doses’ evaluation of these compounds were similar. The values of the preference index ranged from -0.3 to -0.8 for thevariation Ho-Sho and -0.2 to -0.7 for the variation Hon-Sho. The essential oils evaluated in this work showed repellent activity against Sitophiluszeamais in vitro and in trials performed in mini-silos.

Download Full-text

CHEMICAL COMPOSITION, ADULTICIDAL AND REPELLENT ACTIVITY OF ESSENTIAL OILS FROM Mentha longifolia L. AND Lavandula dentata L. AGAINST Culex pipiens L.

Journal of Plant Protection and Pathology ◽

10.21608/jppp.2014.87995 ◽

2014 ◽

Vol 5 (7) ◽

pp. 817-826

Author(s):

Ali Al-Sarar

Keyword(s):

Chemical Composition ◽

Essential Oils ◽

Culex Pipiens ◽

Repellent Activity ◽

Mentha Longifolia

Download Full-text

Antimicrobial activity of essential oils on pathogenic fungi

Revista Agrogeoambiental ◽

10.18406/2316-1817v9n32017979 ◽

2017 ◽

Vol 9 (3) ◽

Author(s):

Daniele Aparecida do Couto ◽

Felipe Da Silva Dias ◽

Mírian Lobo Sáber

Keyword(s):

Essential Oils ◽

Eucalyptus Globulus ◽

Plant Pathogens ◽

Pathogenic Fungi ◽

Human Beings ◽

Cymbopogon Winterianus ◽

Callistemon Viminalis ◽

Pathogenic Agents ◽

Citronella Grass ◽

Mycelial Development

Since the induction of chemical defensives in agriculture, human beings have suffered from our own actions, caused by the indiscriminate and abusive use of those substances; therefore, researches have been motivated to look for alternative ways, aiming to use plant inputs to control pathogenic agents in agriculture. As the essential oils from the species Eucalyptus globulus (eucalyptus), Callistemon viminalis (weeping bottlebrush), Cymbopogon winterianus (citronella grass) and Tetradeniariparia (misty plume bush) have proved effectiveness and an immense applicability, this research studied the use of those essential oils, aiming the effectiveness against plant pathogens. The plants were collected from Universidade do Vale do Sapucaí, Pouso Alegre (MG). The fungi’s samples belong to the mycology collection from the institution and the tests were based on the mycelial development comparison of the control fungi on the dishes with essential oils. Notice that the inhibition caused by the oils over fungi’s mycelial developing and the analysis of the data have been made through Turkey’s statistic. From the data analyzed, it was possible to realize that the citronella’s grass essential oil was efficient to control the mycelial development of fungi analyzed, followed by, in order of efficiency, the eucalyptus oil, the weeping bottlebrush oil and the misty plume bush oil.

Download Full-text