[Control of Anocentor nitens (Neumann, 1897) (Acari: Ixodidae) on equines]. / Controle de Anocentor nitens (Neumann, 1897) (Acari: Ixodidae) em equinos.

This trial evaluated control practices of Anocentor nitens on equines, using spraying devices and application of acaricide paste formulation in the auricular pavilion and nasal diverticulum. The study was carried out from October 2003 to March of 2008 and the evaluations had been divided in the following stages: Phase 1--out/03 mar/04 and Phases 2, 3, 4 and 5, respectively, correspondents to the month's periods until março/08. It was used score of 0 to 3 to classify infestation levels. From abr/04 to mar/06 was implanted a schedule of acaricide sprayings every seven days and divided in two series. The first one beginning in April 2004 and the second beginning in July, both using six sprayings treatments with pyrethroid chemical base--cypermethrin 0,015%, plus topical treatments applied monthly in the auricular pavilions (powder acaricide). From abril/06 to março/08 was carried out similar schedule treatments, each two months, using an experimental acaricide paste in the auricular pavilion and nasal diverticulum. Phases 2 and 3 did not showed reduction of the parasitic loads of A. nitens compared to the control period. Whereas in Phases 4 and 5 registered significant reduction compared control period and also with the results of Phases 2 and 3, characterizing the effectiveness of the treatment with the acaricide paste formulation. Results demonstrated of A. nitens populations present in the nasal diverticulum are important in the maintenance of the infestations on equines, and necessary attention to this anatomical structure when controlling ticks.

[Effect of the urea fertilization in pasture on Rhipicephalus (Boophilus) microplus (Acari: Ixodidae)]. / Efeito da adubação com uréia em pastagem, sobre Rhipicephalus(Boophilus) microplus (Acari: Ixodidae).

The objective of this study was to verify the effect of the urea fertilization in pasture on Rhipicephalus (Boophilus) microplus population in free living stage. Two groups had been made, a control group and a urea treatment group, each group with 10 lots of Mombaça grass (Panicum maximum cv. Mombaça). In day zero had been placed 12 engorged tick females in each lot and made fertilization with urea in the dosage of 60 g in the lots of the treat group. In 27th day the grass was cutted out in 1 to 5 lots of both groups and fertilized with urea in the lots of 1 to 5 in the treat group. In 40th day was released a white flannel 1.60 x 1.00 m length on each lot to verify the presence of larvae. The results presented a difference of 85.97% (P < 0.0001) between the treat group and the control group.

Controle estratégico de Amblyomma cajennense (Fabricius, 1787) (acari: xodidae) em eqüinos, Minas Gerais, Brasil - Parte I / Strategic control of Amblyomma cajennense (Fabricius, 1787) (acari: ixodidae) on horses, Minas Gerais, Brazil - Part I

Objetivou-se verificar a eficiência de um programa de controle estratégico de Amblyomma cajennense em eqüinos sob condições de campo. Os tratamentos carrapaticidas foram realizados a cada sete dias e divididos em dois módulos: o primeiro com início em abril e término em maio de 2004 (oito banhos) e o segundo com início e término em julho de 2004 (cinco banhos), visando atingir as larvas e ninfas do carrapato. Empregou-se a base química piretróide - cipermetrina 0,015 por cento, para banhar os eqüinos. Após o programa de controle houve uma redução de 44,85 por cento da carga parasitária de adultos do carrapato no período de outubro de 2004 a março 2005, e de 59,74 por cento, em fevereiro e março de 2005. Os resultados demonstraram a efetividade do controle estratégico. No entanto, consideram-se importantes fatores operacionais e de gerenciamento que podem interferir na aplicação prática desta tecnologia.

The aim of this study was to verify the efficiency of a strategic control program of Amblyomma cajennense in horses under field conditions. Acaricide treatments were applied at seven days intervals and divided in two series, the first one beginning in April 2004 (eight treatments), and the second one beginning in July 2004 (five treatments), aiming to control larvae and nymphs of the tick. A pyrethroid chemical base cypermethrin 0.015 percent was used for spraying the horses. There was a reduction of 44.85 percent in the adults infestetion of the tick in the period of October 2004 to March 2005, and 59.74 percent, in February and March 2005. Results showed the effectiveness of the strategic control. Important administrative and operational procedures can interfere with the practical application of this technology, and should be considered.