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Sajeev, T. V.
- Seeding baculovirus HpNPV in the epicentre populations of teak defoliator, Hyblaea puera to prevent large-scale outbreaks
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Authors
Affiliations
1 Division of Forest Protection, Kerala Forest Research Institute, Thrissur 680 653, India; Wildlife Research and Conservation Trust, Anupallavi, Chungathara, Nilambur 679 334, IN
2 Division of Forest Ecology and Biodiversity Conservation, Kerala Forest Research Institute, Thrissur 680 653, India; Wildlife Research and Conservation Trust, Anupallavi, Chungathara, Nilambur 679 334, IN
3 Division of Forest Protection, Kerala Forest Research Institute, Thrissur 680 653, IN
1 Division of Forest Protection, Kerala Forest Research Institute, Thrissur 680 653, India; Wildlife Research and Conservation Trust, Anupallavi, Chungathara, Nilambur 679 334, IN
2 Division of Forest Ecology and Biodiversity Conservation, Kerala Forest Research Institute, Thrissur 680 653, India; Wildlife Research and Conservation Trust, Anupallavi, Chungathara, Nilambur 679 334, IN
3 Division of Forest Protection, Kerala Forest Research Institute, Thrissur 680 653, IN
Source
Current Science, Vol 122, No 7 (2022), Pagination: 812-818Abstract
The defoliation caused by Hyblaea puera can result in approximately 44% reduction in the annual volume increment of teak, a major timber tree. Several management options used in the past to control the pest were not effective due to high cost and environmental problems. In the present study we have used the vertical transmission characteristics of Hyblaea puera nucleopolyhedrovirus (HpNPV) for cost-effective and environment-friendly control of the most devastating pest. First, a laboratory experiment was conducted to verify the vertical transmission of HpNPV and later field spraying was done to study the effect under natural conditions. Vertical transmission of HpNPV in the laboratory ranged between 13% and 59%. The sublethal transmission caused reduction in pupation, adult emergence, male and female longevity, egg-laying period, fecundity, hatching of F1 eggs, F1 mortality, F1 pupation and F1 fecundity, but had no influence on the F2 survival compared to the control. Spraying of HpNPV in the epicentre population of the pest resulted a viral epizootic at the F2 generation and led to collapse of the host population. Seeding of HpNPV in the epicentre populations of the teak defoliator has been proved to be an economical and environment-friendly method for management of the pest.Keywords
Baculovirus, epicentre populations, field spraying, Hyblaea puera, teak, vertical transmission.Full Text
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- Role of soil and larval excreta in the horizontal transmission of the baculovirus HpNPV and its implications in the management of teak defoliator Hyblaea puera
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PDF Views:89
Authors
Affiliations
1 Division of Forest Protection, Kerala Forest Research Institute, Thrissur 680 653, India; Wildlife Research and Conservation Trust, Anupallavi, Chungathara, Nilambur 679 334, IN
2 Division of Forest Ecology and Biodiversity Conservation, Kerala Forest Research Institute, Thrissur 680 653, India; Wildlife Research and Conservation Trust, Anupallavi, Chungathara, Nilambur 679 334, IN
3 Division of Forest Protection, Kerala Forest Research Institute, Thrissur 680 653, IN
1 Division of Forest Protection, Kerala Forest Research Institute, Thrissur 680 653, India; Wildlife Research and Conservation Trust, Anupallavi, Chungathara, Nilambur 679 334, IN
2 Division of Forest Ecology and Biodiversity Conservation, Kerala Forest Research Institute, Thrissur 680 653, India; Wildlife Research and Conservation Trust, Anupallavi, Chungathara, Nilambur 679 334, IN
3 Division of Forest Protection, Kerala Forest Research Institute, Thrissur 680 653, IN
Source
Current Science, Vol 122, No 11 (2022), Pagination: 1321-1326Abstract
In baculovirus–insect systems, a mixed-mode transmission strategy involving vertical transmission of virus from parent to offspring, and horizontal transmission from infected to susceptible or from the environment is well known. In this study, we examined the role of soil and excreta as alternative routes of horizontal transmission of Hyblaea puera nucleopolyhedrovirus (HpNPV) in the teak defoliator H. puera and how larval crowding influences these processes. The laboratory experiment failed to identify horizontal transmission of the virus from the soil during pupation or eclosion. However, the role of soil as a reservoir cannot be ignored as chances of transport of viral particles from soil to tree bark are expected through termite nests built on teak stems, which needs further examination. On the other hand, the experiments proved excreta as a major route of horizontal transmission and the rate of infectivity during crowding of larvae was significantly higher. Further research on other routes of horizontal transmission and host behaviour influencing the same are discussed here in the context of their role in managing of teak defoliator outbreaksKeywords
Baculovirus, Horizontal Transmission, Hyblaea Puera, Pest Management, Soil and Larval Excreta, TeakFull Text
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