of certain non-conventional plant based oils against
spider mite of tea
Roy, G. Handique*, F.R. Bora and A. Rahman
Entomology, Tocklai Tea Research Institute, Jorhat- 785 008, India
Author E-mail: firstname.lastname@example.org
Plant based oils
Paper received :
19.10.2016 Revised received :
23.02.2017 Accepted : 01.07.2017
Aim: Red spider mite, Oligonychus
coffeae is considered as one of the most severe and persistent pest of
tea. To limit the use of synthetic acaricides against the pest and to promote
alternative pest control strategies using natural products, the present study
aimed to determine the anti-mite properties of seven plant based oils viz.,
castor oil, sesame oil, rose oil, olive oil, mustard oil, groundnut oil and
karanja oil against O. coffeae.
spider mites were collected from a commercial tea garden of Jorhat, Assam,
India. Bioassays were performed on adults and eggs of O. coffeae with
5 to 7 different concentrations of plant oils. Mortality data was expressed
by Abbott's formula and lethal concentration of 50% mortality (LC50)
was calculated using Finney probit analysis and expressed in ppm.
the plant oils, karanja oil was the most toxic adulticide followed by mustard
oil and olive oil. The egg hatchability was significantly affected in all
treatments with rose oil being most toxic ovicide among the plant oils
followed by karanja oil and olive oil. Further, their bioefficacy was
comparable to synthetic insecticide, ethion.
data suggest that the selected plant oils have potential to control tea red
spider mite, and therefore could be effectively utilized in integrated pest
management programme envisaged for tea mite.
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