LIFE TABLE CHARACTERISTICS OF T richogrammatoidea bactrae Nagaraja AT DIFFERENT TEMPERATURES ON EGGS OF Plutella xylostella (Linnaeus)
Life table of Triclmgralrzmatoizlea baclme Nagaraja, an egg parasitoid of Plutella xylastella (Linnaeus) was studied at different temperatures in the laboratory. Highest net reproductive rate was obtained at 25°C. At temperatures 15° to 20°C parasitoids exhibited Slobodkin‘s Type l response to mortality indicating that in lower temperatures mortality acts more heavily on the old individuals. At 25° and 30°C, parasitoids exhibited Type III response, which refers to constant mortality rate and at 33° and 35°C they exhibited Type IV response indicating mortality acts most heavily on the young individuals. Parasitoid was able to double its population in 2.64 and 2.23 days at 25° and 30°C, however, it took 3.79 to 9.9 days and 4.0 to 4.36 days at temperatures <20°C or >33°C to double its population. Very low reproductive rate, survival and finite rate of increase obtained at temperatures below 20°C or above 30°C indicated that this parasitoid could be used in the field in narrow range of temperature.
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