EXTRATO Hidroetanólico de Erva-de-santa-maria (chenopodium Ambrosioides L.) no Controle do Carrapato de Bovinos [rhipicephalus (boophilus) Microplus Canestrini, 1888 (acari: Ixodidae)]
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Data
2011-09-13
Autores
Almança, Carlos Cesar Jorden
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Universidade Federal do Espírito Santo
Resumo
Aim of this study was to evaluate the effectiveness of the wormseed ( Chenopodium ambrosioides L.) hydroethanolic ex tract in cattle tick [ Rhipicephalus (Boophilus) microplus Canestrini, 1888 (Acari: Ixodidae)] from o ctober to n ovember 2010. Two surveys were conducted : in vivo and in vitro . At first, we used 18 crossbred h ol stein cattle were di stributed into three groups of six animals each. One group was treated with 0,025% amitraz, the second group was treated with a wormseed hydroethanolic ex tract , corresponding to 5.0% of plant and the third group was treated with the veh icle used to prepare the extract above. For the evaluation were counted engorged ticks, length equal to or greater than 4.5 mm before ( - 3, - 2 and - 1 day) and after application of the products ( + 1, + 3, + 7, + 9, + 16 and +21 day). The solution containing 5.0% wormseed hydroethanolic ex tract showed a partial control of ticks, being 52.50%, 60.00% and 56.25% at days + 1, + 9 and + 16 , after application, respectively. A mitraz presented at days + 1, + 3 and + 7 , after application, 55.95%, 67.86% and 66.67% effective agai nst ticks engorged females, respectively. The solution of the vehicle (propylene glycol 5% , ethanol 25% and distilled water) performed at days + 1, + 3 and + 16 , after application, efficiency of 40.54%, 62.16% and 63.51% respectively. In in vitro experiments evaluated the effectiveness of different concentrations obtained by maceration of wormseed hydroethanolic ex tract on posture and hatchability of eggs of ticks, using the adult immersion test. The treatments consisted of distilled water , vehicle solution ( consisting of 5% propylene glycol, ethanol 25% and 70% distilled water) and solutions containing 5.0%, 10% and 25% wormseed hydroethanolic ex tract . The ticks were distributed in homogeneous groups, by size, level of engorgement and weight were 10 ticks per group (average 2.0 g) and were subjected to an immersion for five minutes in each of the products tested. The solutions containing 5%, 10% and 25% wormseed hydroethanolic ex tract had average efficiencies 13.27%, 22.56% and 31.87% respectively on the postu re and hatchability of eggs. The solution of the vehicle had an efficiency of 10.48%. Based on these results, C. ambrosioides L. , at the concentrations tested, does not present significant potential for the control of the strains researched Rhipicephalus ( Boophilus) microplus , although they showed toxic effects. Further experiments are needed to evaluate the acaricidal activity of other 10 extracts and essential oils of C. ambrosioides L. , on adults and larvae of R hipicephalus (B.) microplus , and evaluate the toxicity of these products in cattle
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Acaricide , Engorged females , Medicinal plants , Phytotherapy , Acaricida , Fitoterapia , Plantas medicinais , Teleóginas