Journal of Applied and Natural Science 6 (1): 62-67 (2014)
Field efficacy of some biorationals against the two spotted spider mite
Tetranychus urticae Koch (Acari: Tetranychidae)
Kanika Tehri* and Rachna Gulati
Department of Zoology, CCS Haryana Agricultural University, Hisar (125004), INDIA
*Corresponding author. E-mail: email@example.com
Abstract : Field trials were conducted to evaluate the acaricidal
potential of entomopathogenic fungus, Beauveria bassiana and aqueous
extracts of Withania somnifera and Glyccirrhyza glabra against
the mobile stages of Tetranychus urticae Koch on cucumber. The
treatments responded in a concentration dependent manner. Highest reduction in
T. urticae population was achieved with Omite (0.05%) followed by
Nimbecidine (5ml/l), B. bassiana (1010 spores
ml-1), W. somnifera (7.5%), B.
bassiana (108 spores ml-1), G. Glabra
(7.5%), G. Glabra (5%), G.
Glabra (2.5%), W. somnifera (5%) and
W. somnifera (2.5%). Higher yield was
recorded in all the treatments as compared to control. In terms of percent
increase in yield, Omite caused highest increase (23.65% over control) followed
by Nimbecidine, B. bassiana (1010 spores/
ml), W. somnifera (7.5%), B.
bassiana (108 spores/ ml), G. Glabra
(7.5%), W. somnifera (5%),
G. Glabra (5%), G.
Glabra (2.5%), and W. somnifera (2.5%)
showing 13.97, 11.82, 10.75, 8.67, 8.67, 8.6, 6.76, 6.48 and 6.45 percent
increase over control, respectively. These data suggest that the tested
biorationals at higher concentrations have the potential to be employed in pest
management programs designed for T. urticae control.
Keywords : Beauveria bassiana, Cucumber, Glyccirrhyza glabra, Tetranychus urticae, Withania somnifera