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Articles by K. Veenakumari
Total Records ( 2 ) for K. Veenakumari
  A. Mehrvar , R.J. Rabindra , K. Veenakumari and G.B. Narabenchi
  Experiments conducted to study the effect of various adjuvants on the larval mortality of Helicoverpa armigera NPV under simulated sunlight revealed that all the adjuvants (either alone or in combination) resulted in significantly higher larval mortality as compared to the virus alone. A combination of three adjuvants, viz., molasses (5.0%) + Tinopal (0.2%) + lampblack (0.1%) showed the highest larval mortality (94.2%) under simulated sunlight with the lowest LT50 values (99.6 h). It was also observed that the persistence of HearNPV was higher when molasses (5.0%) + Tinopal (0.2%) + lampblack (0.1%) was used as adjuvant with an OAR (original activity remaining) of 86 and 36.2% after 1 and 6 days after treatment, respectively under open weather conditions on tomato plants.
  A. Mehrvar , R.J. Rabindra , K. Veenakumari and G.B. Narabenchi
  The effect of four major parameters, viz., larval age and weight, inoculation dose, incubation temperature and time of harvesting the larvae, on the production of three isolates of nucleopolyhedrovirus of Helicoverpa armigera (HaNPV), viz., Ooty (OTY), Coimbatore (CMB) and Negamum (NGM) were evaluated. Early 5th instar larvae recorded the maximum yield of virus per larva when inoculated with a dose of 5χ105 POB larva‾1 and incubated at a temperature of 25°C. Also, highest POB yield was recorded when virosed larvae were harvested as cadavers. However, among the isolates tested in this study, CMB isolate collected from Tamil Nadu, India, showed the highest yield per larva in all of the conditions.
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