Management of Tetranychus urticae Koch. (Acarina : Tetrancychidae) of Carnation mite Under Polyhouse Condition
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Date
2010-06
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Agricultural Entomology Department, N. M. College of Agriculture, Gujarat Agricultural University
Abstract
An investigation was carried out on biology, population
dynamics, varietal screening and chemical control against
carnation mite T. urticae (Acari: Tetranychidae) at Navsari
Agricultural University, Navsari, Gujarat during 2008-2009.
Studies on biology of T. urticae revealed that both the
sexes passed through five stages viz. egg, larva, proto nymph,
deutonymph and adult with a short resting period known as
quiescent. Morphology of all the stages, period of immature stages,
longevity of adults and reproductive potential of T. urticae were
also studied.
Studies on population dynamics of T. lIrticae revealed
that incidence of T. urticae was started from the last week of
February then increased gradually to reach its peak during first
week of July (34.51 mite/plant). The maximum and minimum
temperature was significantly positive correlation and morning RH
•
and evening RH were negatively correlated with T. urticae
population.
Studies on varietal screening of carnation against T.
urticae revealed that Orange firato proved less susceptible variety
with low mite incidence. While, varieties Beaumonde was found
more susceptible to T. urticae.
The bioefficacy of different insecticides tested under
poly hose against T. urticae revealed that the propargite 0.05 per
cent as most effective insecticide in per cent reduction the T.
urticae population with good net BCR (1: 8.98). Abamectin 0.0025
per cent stood second best treatment where as dimethoate 0.03 per
cent found effective against mite with good net BCR (\: 8.93) .
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PATIL DINESH LILADHAR_43855