LIFE TABLE CHARACTERISTICS OF T richogrammatoidea bactrae Nagaraja AT DIFFERENT TEMPERATURES ON EGGS OF Plutella xylostella (Linnaeus)

S. K. JALALI, S. P. SINGH, T. VENKATESAN

Abstract


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.


Keywords


Life table; Plufella xylostella; Trichogrammaloidea baclrae

Full Text:

PDF

Refbacks

  • There are currently no refbacks.


=====================================================================

PMHE, Pest Management in Horticultural Ecosystem. 2013 © Association for Advancement of Pest Management in Horticultural Ecosystems, all right reserved.
Use of this website signifies your agreement to the Terms of Use.

Concept Conceived By: Chief Editor and Online Team,AAPMHE
Executed By: Thippeswamy S, Asst. Chief Technical Officer
ICAR-IIHR,Bengaluru-89

Proudly powered by OJS