In-vitro Studies on Efficacy of Native Entomopathogenic Nematodes (Steinernema carpocapsae) on Cattle Ticks: Efficacy of Entomopathogenic Nematodes on Cattle Ticks
2023
Kachhawaha, Subhash | Maru , Ajay Kumar | A.U. Siddiqui
Entomopathogenic nematodes (EPNs) have beensuccessfully used as biological control agents for insectsof economically important crops. In the present study,bio-efficacy of two different strains of entomopathogenicnematodes, Steinernema carpocapsae STSLU and S. carpocapsaeSTUDR against two different cattle hard ticks, Rhipicephalusmicroplus and Hyalomma savignyi was evaluated based onpercentage mortality under laboratory conditions. Theadult female cattle ticks (of both species) were treated withinfective juveniles (IJs) of both the strains of S. carpocapsae atdifferent inoculum levels. All the treatments were replicatedfour times at 20ºC. Percentage mortality of the cattle tickswas determined every 24 hours up to 120 hours from thetime of inoculation. The experimental results showed thecattle tick R. microplus was more susceptible to both strainsof Steinernema carpocapsae than that of H. savignyi. Further,S. carpocapsae STSLU was more efficient than S. carpocapsaeSTUDR and caused 100 and 97.5% mortality of R. microplusand H. savignyi, respectively at a concentration of 250 IJs Petridish-1 after 120 hours of inoculation. The entomopathogenicnematodes can be cultured easily in an artificial mediumand have high reproductive efficiency, broad host range,long storage ability, ease of application and being safe forthe host make them promising bio-control agent against R.microplus and H. savignyi. This may be evaluated further infield conditions in different seasons and temperatures. Futureresearch may be directed towards emerging technologies ofticks control without acaricide uses
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