K. Padma Vathamma ¹, G. K. Veeresh ²

Affiliations
1 S. V. Agricultural College, Tirupati 517 502, A.P., IN
2 Department of Agricultural Entomology, University of Agricultural Sciences, GKVK, Bangalore - 560 065, IN

Abstract

The occurrence of granulosis virus in Plutella xylostella was first recorded in Japan (Asayama and Osaki, 1970). Though, Nagarkatti and Jayanth (1982) collected two diseased larvae infected with nuclear polyhedrosis virus from Bangalore. no further work was on record regarding this virus in the country. In March. 1987, diseased larvae of diamond back moth were found in a cabbage field at Sriramapura village near Bangalore and on examination, the infected individuals revealed the presence of nuclear polyhedral inclusion bodies (PIB) and further detailed investigations were undertaken.

Keywords

Plutella xylostella, NPV, Electron Microscopy, Symptomatology.

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K. Padmavathamma ¹, G. K. Veeresh ¹

Affiliations
1 Department of Agricultural Entomology, University of Agricultural Sciences, Bangalore 560 065, IN

Abstract

Nuclear polyhedrosis viruses are transmitted through generations in two possible ways (Steinhaus, 1954; Aizawa. 1963). Transmission of virus through the contaminated egg surface is tenned as transovum whereas, transmission of the virus within the egg itself is designated as transovarial (Martignoni and Milstead, 1962). The time of application of nuclear polyhedrosis virus (NPV) in relation to egg hatching is a critical factor for achieving a high degree of effectiveness as observed in Heliothis spp. (House et al., 1976). Hence. the present investigation was taken up to study the effect of different concentrations of the virus when applied on eggs of different ages of Plutella xylostella (L.).

Keywords

NPV, Plutella xylostella, Eggs, Control.

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