STATISTICAL ASSESSMENT OF POPULATION DYNAMICS OF TEA MOSQUITO BUG ON CASHEW
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Date
2010-07-12
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University of Agricultural Sciences, Bangalore
Abstract
A modest attempt has been made to assess the population
dynamics of tea mosquito bug on cashew .For the present study data is
taken from Zonal Agricultural Research Station, Brahmavar about
infestation parameters and weather parameters, in weekly intervals for
10 years (1998-2008) on the cashew variety vengurla-4 in a control plot.
The regression analysis indicated that the weather parameters namely
wind speed, rainfall, sunshine hours, minimum and maximum
temperature are found to be highly significant in influencing the mirid
population, except mean sunshine hours all other factors negatively
influenced the population of TMB. Multiple discriminant analysis for the
entire data with four groups indicated that damage at new flush, fruit
development stage and Rh2, Rh1, mrf are the major contributors for
discrimination. The principal component analysis showed that the pest
at new flush stage, Panicle initiation and shoot infestation attack stages
which are the critical stages of cashew production significantly
influences the crop yield. The correspondence analysis indicated that
there is association between the months and the different infestation
stages. The infestation parameters are closely associated with one or the
other month and the existing weather conditions. Any control measure to
be taken can be planned much before the infestation occurs.
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