Two strains of nuclear polyhedrosis viruses isolated from important insect pests in Thailand, H. armigera and S. exigua, were studied and results suggest that they were two different viruses.
These findings were supported by the different patterns of arrangement of virions in the polyhedra, serological studies and data of bioassays of viruses against homologus and heterologous species of hosts.
The virus isolated demonstrated a selective species specific reaction. Both viruses isolated were found to effectively kill all stages of homologous larval species with LC50 values ranging from 6.72 to 1255.06 PIBs/mm2 for H. armigera NPV and 7.40 to 476.01 PIBs/mm2 for S. exigua NPV.
Each of the viruses displayed a similar set of symptoms caused by a typical characteristic of NPV. There was a slight increase in incubation period with the increase of larval age for both virus isolates against homologous host species.
It suggests that it is possible to use these two viruses isolated to control H. armigera and S. exigua larvae in the field.
by aovaluk Hungspruke; Mahidol Univ., Bangkok (Thailand). Faculty of Graduate Studies [Corporate Author]
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