In-vitro Studies on Efficacy of Native Entomopathogenic Nematodes (Steinernema carpocapsae) on Cattle Ticks
Efficacy of Entomopathogenic Nematodes on Cattle Ticks
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Abstract
Entomopathogenic nematodes (EPNs) have been
successfully used as biological control agents for insects
of economically important crops. In the present study,
bio-efficacy of two different strains of entomopathogenic
nematodes, Steinernema carpocapsae STSLU and S. carpocapsae
STUDR against two different cattle hard ticks, Rhipicephalus
microplus and Hyalomma savignyi was evaluated based on
percentage mortality under laboratory conditions. The
adult female cattle ticks (of both species) were treated with
infective juveniles (IJs) of both the strains of S. carpocapsae at
different inoculum levels. All the treatments were replicated
four times at 20ºC. Percentage mortality of the cattle ticks
was determined every 24 hours up to 120 hours from the
time of inoculation. The experimental results showed the
cattle tick R. microplus was more susceptible to both strains
of Steinernema carpocapsae than that of H. savignyi. Further,
S. carpocapsae STSLU was more efficient than S. carpocapsae
STUDR and caused 100 and 97.5% mortality of R. microplus
and H. savignyi, respectively at a concentration of 250 IJs Petri
dish-1 after 120 hours of inoculation. The entomopathogenic
nematodes can be cultured easily in an artificial medium
and have high reproductive efficiency, broad host range,
long storage ability, ease of application and being safe for
the host make them promising bio-control agent against R.
microplus and H. savignyi. This may be evaluated further in
field conditions in different seasons and temperatures. Future
research may be directed towards emerging technologies of
ticks control without acaricide uses
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