Development of Superior Strain of Trichogramma chilonis Ishii for Temperature Tolerance
Adaptation to climatic conditions (more importantly the temperature) of an area play a decisive role in influencing the parasitoid efficiency in controlling pests. Besides, the optimal conditions for inundative release of parasitoid e.g. Trichogramma, may also depend on strain. A strain of Trichogramma chilonis tolerant to high temperature was developed in the Biological control laboratory of IARI (PUSA), New Delhi and effect of temperature was studied on parasitoid efficiency. The biological traits viz., fecundity, emergence, survivability (male&female) and female populations were studied at 25, 27, 29, and 31ºC. The fecundity and emergence were recorded highest at 27 ºC. An increase of 107.23% (fecundity), 184.50% (emergence) and 15.65% (female survival) was observed from base to 35th generation, while male survival and female population decreased by 8.2 and 1.2%, respectively. The survival of immature stages of tolerant strain of Trichogramma proved their ability to withstand the temperature.
Emergence, Fecundity, Parasitoid, Longevity, Trichogramma, Sex Ratio.
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