Seasonal Activity of Ticks (Acarina: Metastigmata) on Cattle in Southwestern Texas

Drummond, R. O.

doi:10.1093/aesa/60.2.439

Cited by 26 publications

(14 citation statements)

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“…Although infestation with a single species of tick were recorded, most of the animals examined during the study had mixed infestation with different tick species. A similar trend of tick infestation has been observed by different workers (Drummond 1967;Iqbal 1971). However, variation in the rates of prevalence between single and mixed infestation exist, which can be attributed to the exposure of the animals and/ or innate resistance to some species of ticks (Daynes and Gutierrez 1980).…”

Section: Tick Species Identified In Pakistansupporting

confidence: 88%

Status of tick distribution in Bangladesh, India and Pakistan

et al. 2007

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On a global basis, ticks transmit a greater variety of pathogenic microorganisms, protozoa, rickettsiae, spirochaets, and viruses than any other arthropods and are among the most important vectors of diseases affecting livestock, humans, and companion animals. Ticks and tick-borne diseases (TTBDs) affect 80% of the world cattle population and are widely distributed throughout the world, particularly in tropical and subtropical countries including India, Pakistan, and Bangladesh. Ticks and tick-transmitted infections have coevolved with various wild animal hosts, which constitute the reservoir hosts for ticks and tick-borne pathogens of livestock, pets, and humans. In this region, the livestock sector is suffering from a number of disease problems caused by bacteria, viruses, fungi, and parasites. Among the parasitological problems, the damage caused by TTBDs is considered very high, and the control of TTBDs has been given priority.

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Section: Tick Species Identified In Pakistansupporting

confidence: 88%

Status of tick distribution in Bangladesh, India and Pakistan

et al. 2007

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“…Similar discordant results have been reported in South Africa, where Theiler & Salisbury (1958) found no seasonal trend for O. megnini , but Dreyer et al (1998) reported the highest infestation during the warmer months of the year. Drummond (1967) found seasonal peaks in different seasons during a 6‐year‐long study in southwestern Texas (U.S.A.).…”

Section: Discussionmentioning

confidence: 96%

Field and laboratory studies in a Neotropical population of the spinose ear tick,Otobius megnini

Nava

Mangold

Guglielmone

2009

Medical Vet Entomology

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One ear of each of five cows on a property close to Dean Funes, province of Córdoba, Argentina, was inspected monthly from December 2004 to November 2006 to determine the presence of Otobius megnini (Dugès) and to ascertain its seasonality. Ticks were collected to study the biological parameters of larvae, nymphs and adult ticks. Groups of nymphs were also maintained at three different photoperiods at 25 degrees C. The abundance of immature stages was greatest during January-April and August-October in the first and second years of the study, respectively. No larvae successfully moulted. Nymphs weighing < 17 mg also failed to moult, but 89% of heavier nymphs moulted into adults. Nymphs moulting to males weighed less (49.5 +/- 16.09 mg) than nymphs moulting to females (98.1 +/- 34.08 mg). The pre-moult period was similar for nymphs moulting to either sex and significantly longer (P < 0.01) for female nymphs maintained at 25 degrees C compared with nymphs kept at 27 degrees C. No effect of photoperiod on the pre-moult periods of nymphs was detected. Female ticks produced a mean of 7.0 +/- 1.94 egg batches after a preoviposition period of 16.4 +/- 8.41 days for the first batch. The mean oviposition period was 61 +/- 20.8 days and the duration of oviposition for each batch varied from 1 to 6 days. The mean number of eggs per batch was 93.1 +/- 87.53. The minimum incubation period for the first egg batch was 13.6 +/- 2.77 days. The total number of eggs laid by each female was 651.6 +/- 288.90. Parthenogenesis was not observed. The reproductive efficiency index (REI) (number of eggs laid/weight of female in mg) was 5.5 +/- 1.26. Pearson's correlations showed a significant direct relationship between the weight of the female and number of eggs laid (P < 0.01) and REI (P < 0.05). Several of the biological values presented above for the tick population from the Neotropical zoogeographic region showed marked differences to equivalent values for O. megnini populations from the U.S.A. (Nearctic) and India (Oriental). Nevertheless, the only two sequences of 16S rDNA deposited in GenBank from ticks originating in Argentina and allegedly in the U.S.A. indicate that they are conspecific (99.8% agreement). We tentatively consider the biological differences among populations of this tick species to represent adaptations for survival at different conditions.

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“…Studies conducted in Argentina [6,58], South Africa [59,60], and Texas, USA [61] have reported discordant results for seasonal activity for O. megnini indicating absence of a clear seasonal pattern. Further, climatic factors such as annual rainfall, temperature, and altitude appear to have no profound effect on distribution and seasonal dynamics of O. megnini populations in Argentina and the Union of South Africa [58,60,62].…”

Section: Seasonal Dynamicsmentioning

confidence: 99%

Spinose Ear Tick Otobius megnini Infestations in Race Horses

Rajakaruna¹,

Diyes²

2019

Ticks and Tick-Borne Pathogens

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Spinose ear tick, Otobius megnini, has a worldwide distribution causing otoacariasis or parasitic otitis in animals and humans. It mainly infests horses and cattle. It is a nidicolous, one-host soft tick spread from the New World to the Old World and is now distributed across all the continents. Only the larvae and nymphs are parasitic, feeding inside the ear canal of the host for a long period. Adult males and females are free-living and nonfeeding, and mating occurs off the host. Being inside the ear canal of the host allows the tick to be distributed over a vast geographic region through the distribution of the host animals. The presence of infectious agents Coxiella burnetii, the agent of Q fever, spotted fever rickettsia, Ehrlichia canis, Borrelia burgdorferi, and Babesia in O. megnini has been reported, but its role as a vector has not been confirmed. Human infestations are mostly associated with horse riding and farming through close contacts with companion animals. Control measures involve use of acaricides, repellants, and biological control methods. However, controlling the tick population and its spread is extremely difficult due to its life cycle pattern, seasonal dynamics, and resistance to certain acaricides.

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Seasonal Activity of Ticks (Acarina: Metastigmata) on Cattle in Southwestern Texas

Cited by 26 publications

References 0 publications

Status of tick distribution in Bangladesh, India and Pakistan

Status of tick distribution in Bangladesh, India and Pakistan

Field and laboratory studies in a Neotropical population of the spinose ear tick,Otobius megnini

Spinose Ear Tick Otobius megnini Infestations in Race Horses

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