Impact of release of Baculovirus oryctes into a population of Oryctes rhinoceros in an oil palm plantation in India. - (:unkn) unknown (My University)
Baculovirus was released into a natural population of Oryctes rhinoceros beetles with indigenous baculovirus disease incidene (60) in an oil palm plantation located in a mainland area in India between July and August 1986. Impact of the virus release on pest infestation and on the prevalence of the viral disease in the larval population were monitored from July 1986 to December 1991. After the virus release, the intensity of infestation in oil palm declined drastically in the first three years, after which the infestation level attained an equilibrium. Yearly cumulative infestation also came down from 70.8 to 20.7 percent in the first three years after virus release, after which it remained low (23.4-25.5). During the second and third year aftervirus release, disease incidence among the O. rhinoceros larvae was higher in the breeding sites located in (36.81-44.08 in zone I) and around 37.0-42.7 in zone II) the site of virus release, than in the breeding sites located away from the site of virusrelease (30.45-31.72 in zone III). However, from the fourth year after virus release the percentage of larvae infected with baculovirus declined in all the three zones, and during the fifth year there were no significant differences the three zones (19.67-23.82). Circumstantial results suggest that the reduction in pest infestation after virus release is due to greater input of pathogens into pest population. The results also suggest that even in the bacilovirus disease prevalent mainland area, additional release of baculovirus infected beetles could further reduce the O. rhinoceros population.
25 ref.
Baculovirus was released into a natural population of Oryctes rhinoceros beetles with indigenous baculovirus disease incidene (60) in an oil palm plantation located in a mainland area in India between July and August 1986. Impact of the virus release on pest infestation and on the prevalence of the viral disease in the larval population were monitored from July 1986 to December 1991. After the virus release, the intensity of infestation in oil palm declined drastically in the first three years, after which the infestation level attained an equilibrium. Yearly cumulative infestation also came down from 70.8 to 20.7 percent in the first three years after virus release, after which it remained low (23.4-25.5). During the second and third year aftervirus release, disease incidence among the O. rhinoceros larvae was higher in the breeding sites located in (36.81-44.08 in zone I) and around 37.0-42.7 in zone II) the site of virus release, than in the breeding sites located away from the site of virusrelease (30.45-31.72 in zone III). However, from the fourth year after virus release the percentage of larvae infected with baculovirus declined in all the three zones, and during the fifth year there were no significant differences the three zones (19.67-23.82). Circumstantial results suggest that the reduction in pest infestation after virus release is due to greater input of pathogens into pest population. The results also suggest that even in the bacilovirus disease prevalent mainland area, additional release of baculovirus infected beetles could further reduce the O. rhinoceros population.
Keywords: Baculoviridae.; Coleoptera.; Control biológico; Control de plagas.; escarabajo rinoceroente; Oryctes.; Virus de invertebrados.; Palma de aceite