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Journal of Biological Sciences
Year: 2009  |  Volume: 9  |  Issue: 3  |  Page No.: 264 - 267

Persistence of Different Geographical Isolates of Helicoverpa armigera Nucleopolyhedrovirus in Two Types of Soils under Different Conditions

A. Mehrvar    

Abstract: An experiment was conducted to evaluate the persistence of Helicoverpa armigera NPV after 6 months of storage in two types of soil viz., black soil and red soil under different conditions to screen the relatively persistent HearNPV geographical isolate. The isolates of the virus used in this study were CMB (Coimbatore), NGM (Negamum) and OTY (Ooty) all collected from Tamil Nadu, India. Two types of soils viz., black soil and red soil were selected to study the persistence of HearNPV. Each virus isolate (1x109 OB mL-1) was added to 2 kg of each soil and kept in indoor and outdoor conditions in plastic troughs for 6 months. Assays were carried out with extracted viruses from each soil at monthly intervals against early second instar larvae of H. armigera. Results indicated that as the period of storage of virus in soil was advanced the mean mortality percentage declined. Also, the comparison of results showed that the virus treated black soil kept indoor could relatively retain its infectivity (52.66, 58.56 and 54.35% OAR with CMB, NGM and OTY isolates, respectively) longer period compared to the soil kept outdoor. Similar kind of trend was also noticed with red soil. However, the infectivity was relatively more in the case of HearNPV stored in red soil compared to those stored in black soil. This high amount of persistence in red soil may be due to the fact that adsorption rate was higher in red soil than black soil. However, among the isolates evaluated in this study, NGM isolate was found to be the most relatively tolerant to inactivation through the storage time.

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