GROWTH OF Trichogramma TEMPERATURE TOLERANT STRAIN VIS-À-VIS NON-TOLERANT POPULATION AT HIGH TEMPERATURE CONDITIONS
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Date
2015-10-10
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
The present study was conducted on the growth of Trichogramma chilonis
temperature tolerant strain and non-temperature tolerant population at ambient (27±2 ºC)
and various high temperature conditions (32º- 40 ºC) in order to assess their population
growth pattern in normal laboratory temperature condition and at high temperature
conditions, life tables studies at ambient and high temperature conditions and the growth
at deficient and abundant host ability. The temperature tolerant strain is adapted to both
the temperature conditions. For non-temperature tolerant strain per cent parasitism (65.44
%) and per cent adult emergence (69.7 %) decreased with increase in temperature. Mean
development period of both strains decreased with increase in temperature but female
ratio of the strains increased with increase in temperature. The life table studies shows
that both strains at high temperature conditions had the highest Ro, rm, and λ followed by
the same strains at ambient temperature condition. The studies on biological parameters
at different host density shows that number of parasitized eggs increased with egg density
but per cent parasitism decreased. The per cent parasitism of temperature tolerant strain
was found to be maximum (93.3 %) at lowest density (10 eggs) and minimum (86.9 %) at
density of 150 eggs. For non-tolerant strain the highest per cent parasitism was observed
at 90 eggs (91.44 %). The per cent adult emergence and per cent females of both strains
increased with egg density. The adult emergence was found to be maximum at 90 eggs
and minimum at 10 egg density.
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