The effect of temperature and fasting period on the viability of free-living females of Rhipicephalus sanguineus (Acari: Ixodidae) under laboratory conditions.

Little is known about the effect of temperature on viability of free-living phases of the life cycle of Rhipicephalus sanguineus (Latreille, 1806) despite of its importance as vector of several pathogens. Knowledge of the effect of abiotic factors on the capacity of a given tick species to infest new hosts is important for routine experimental activities under laboratory conditions, and may be relevant to understand the transmission of pathogens. The study evaluates the viability of R.

Spatial distribution and impact of cattle-raising on ticks in the Pantanal region of Brazil by using the CO(2) tick trap.

This study evaluates the impact of cattle-raising on ticks associated with wildlife in the Pantanal region of Brazil, by trapping free-living ticks using a CO(2) tick trap. The traps were equally distributed in two areas: a 600-ha protected area (PA) and the Nhumirim Ranch (NR). Both areas are contiguous and located at the sub-region of Nhecolândia (18 degrees 59'S; 56 degrees 39'W), Pantanal, Brazil.

[Influence of aggregation on the molting process of Rhipicephalus sanguineus, (Latreille, 1806) (Acari: Ixodidae) under laboratory conditions].

The objective of this experiment was to evaluate the influence of different aggregations on the molting process of Rhipicephalus sanguineus (Latreille, 1806). Tick-naïve domestic rabbits (Oryctolagus cuniculus) were used as experimental hosts for the parasitic phase. A total of 10 rabbits were used on the experiment.

[Influence of aggregation on the molting process of Haemaphysalis leporispalustris (Acari: Ixodidae) under laboratory conditions].

The aim of the experiment was to evaluate the influence of different aggregations on the molting process of the nidicoulus ticks, Haemaphysalis leporispalustris. Tick-naïve domestic rabbits (Oryctolagus cuniculus) were used as experimental hosts for the parasitic phase. All free-living phases were kept into 4.

[Infestation with Linognathus africanus (Kellogg e Paine, 1911) (Linognathidae) and Bovicola caprae (Ewing, 1936) (Trichodectidae) in goat flock of the State of Rio de Janeiro, Brazil].

Mixed infestations with Linognathus africanus and Bovicola caprae were diagnosed in a lot of 20 goats from a flock of 40, belonging to a farm from the Universidade Federal Rural do Rio de Janeiro, Rio de Janeiro, RJ (22 degrees 44'38''S and 43 degrees 42'27''W). Animals were of both sexes, varied ages and different breeds (half blood Saanen/Boer, Saanen, cross breeds), were examined in April of 2004. With an exception of one goat, parasitized only by L.

[The effect of immersion in distilled water on the engorged larvae and nymphs of Amblyomma dubitatum Neumann, 1899 (Acari: Ixodidae)].

To evaluate the effect of the immersion of engorged larvae and nymphs of Amblyomma dubitatum experimentally fed on rabbits, the ticks were collected and formed control groups, without immersion, and groups witch were immersed by 24, 48, 72, 96 hours and, for engorged larvaes, by eight weeks, in test tubes containing distilled water. During all experiment ticks were kept at 27 +/- 1 degrees C, 80 +/- 10% RU and scotophase The parameters evaluated were: pre-ecdysis, ecdysis and moulting periods; and ecdysis and mortality percentages. When compared with the control group, the effect (p<0,05) of immersion varied intra and inter stages.