2008-'09 - Kerala Forest Research Institute

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Annual Report 2008-09 Laboratory culturing of HpNPV H. puera larva on teak seedling conducted to see if resistance build-up occurred when the insects were sublethaly infected. Finally, lattice spraying of HpNPV was done at an epicentre population of the insect and the growth and reproductive parameters of the insect were quantified. The study indicated that virus dosages around a hundred polyhedral occlusion bodies when ingested by teak defoliator larvae resulted in mortality of 60% of the population. The insects that survived the above-said dose retained the baculovirus in their body in an unexpressed form and transmitted the disease to the next generation. The impact of vertical transmission included reduction in pupation, adult emergence, male and female longevity, egg laying period and fecundity. However, the sex ratio remained unchanged. One third of the offsprings which received the vertically transmitted baculovirus died and the survivors showed reduced pupation rate, adult emergence rate, fecundity and longevity. HpNPV when vertically transmitted reduced the reproductive potential of the insect during the parent and first filial generation so as to inflict 100 percent mortality in the second filial generation. The study indicated that sublethal seeding of baculovirus during the epicentre phase of the eruptive outbreaks of teak defoliator could cause viral epizootics which, in turn, could suppress population buildup and prevent large scale outbreaks. Detailed field studies involving control of the teak defoliator epicenter populations using the concept of vertical transmission impacts would confirm findings of the present study. Transfer of technology of biological control of the teak defoliator pest to the Kerala Forest Department for field implementation and entrepreneurs for commercial production The culture of host insect H. puera was maintained as part of mass production and formulation of HpNPV. The culture would cater to the requirement of Hyblaea larvae for HpNPV multiplication. HpNPV was produced as a routine activity so that the at any required time point the formulation could be developed. A database of teak farmers in Kerala and Karnataka who have taken planting Kerala Forest Research Institute 63
Annual Report 2008-09 Field demonstration of H. puera control using HpNPV HpNPV formulation material from KFRI nursery was prepared. They were contacted and informed about the availability of technology for teak defoliator management. Sustainable Forest management Optimizing management of bamboo stands using growth simulation model A set of 22 semi-permanent sample plots were laid out in bamboo plantations and natural bamboo stands representing various age groups, stocking levels and site conditions in different parts of the State of Kerala. The plot size varied from 30m x A typical bamboo stand 64 Kerala Forest Research Institute
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Page 93 and 94: Annual Report 2008-09 and Marketing
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Page 107 and 108: Annual Report 2008-09 BALANCE SHEET
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Page 117: Annual Report 2008-09 41. Shri. V.N
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2008-'09 - Kerala Forest Research Institute

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