Avaliação da atividade repelente do timol, mentol, salicilato de metila e ácido salicilico sobre larvas de Boophilus microplus (Canestrini, 1887) (Acari: Ixodidae)

Abstract

Verificou-se a atividade repelente do timol, mentol, ácido salicílico e salicilato de metila sobre larvas de Boophilus microplus. Essas substâncias foram usadas em emulsões em dimetilsulfuxido aquoso a 1% ou solução aquosa. Para cada substância foram testadas três concentrações, 1,0%; 0,5% e 0,25%, com cinco repetições cada. Cerca de 100 larvas, com 21 dias de idade, foram inseridas na base de hastes de madeira para avaliação da repelência, a cada duas horas, totalizando 12 horas. As concentrações mais elevadas apontaram que as quatro substâncias causaram alteração no comportamento das larvas. Timol, com mortalidade de 65% e 35% de repelência e mentol e salicilato de metila, ambos com 80% de repelência foram os mais eficientes.

Composition and biological activity of essential oils from Labiatae against Nezara viridula (Hemiptera: Pentatomidae) soybean pest

“…EO from T. vulgaris proved to be an efficient repellent against different mosquito species 17, 62, 63. Thymol also produced repellency against other pests 64, 65. On the other hand, the EO from O. vulgare did not produce a repellent effect on Culicoides imicola (Kieffer), the vector of the African horse sickness virus 66, 67.…”

Assessment of the repellent effect of Lippia alba essential oil and major monoterpenes on the cattle tick Rhipicephalus microplus

“…target species away from the odour source (Jaenson et al, 2005). The repellent effect of active substances of plants can be used in the formulation of products to repel ticks from humans and animals (Novelino et al, 2007). The effect of L. alba essential oil on the behaviour of climbing ticks is an indicator of the degree of repellence of this essential oil against R. microplus larvae.…”

Acaricide and ovicide activities of thymol on engorged females and eggs of Rhipicephalus (Boophilus) microplus (Acari: Ixodidae)

“…This monoterpene has already had its insecticide, bactericide, fungicide, and molluscicide potential evidenced by different authors (Imdorf et al 1995;Mansour et al 2000;Ferreira et al 2009), though its acaricide effect was only demonstrated recently for immature of R. (B).microplus (Novelino et al 2007a, b), Rhipicephalus sanguineus (Latrelle 1906) (Acari: Ixodidae) Monteiro et al 2009). Its repellent activity on tick larvae of the bovine was also demonstrated by Novelino et al (2007b). Thus, the objective of the present work was to evaluate the influence of the different concentrations of thymol on the biological parameters of engorged females of R.…”