JavaregowdaVinutha C. S.2017-03-062017-03-06http://krishikosh.egranth.ac.in/handle/1/5810004091“Great Indian Teak” is an important timber species preferred all over the world because of its versatile range of uses and priced for its valuable timber. Its distinctive qualities make it an ideal raw material for multifarious products as well as an important agro-forestry species. About 187 insect species have been found feeding on the living teak tree in India. Among these, the teak defoliator, Hyblaea puera Cramer is the most widespread and considered as serious national pest. Of the nine leaf traits considered, leaf pubescence and leaf texture was found to be associated with the levels of resistance. Fifty clones of teak from nine provenances of Karnataka have been evaluated for their resistance/susceptible in vivo in search of resistance against H. puera. Clones ID STG-3 and STG-12 (State Graft) were found to be the most resistant and susceptible clone, respectively. The resistance clones viz., STG-3 showed a significant higher concentration of phenol and most susceptible clone, STG-12 of state grafts contain very low amount of phenol (0.02%). The higher concentration of nitrogen was recorded in the most susceptible clone STG-12. Potassium content was directly proportional to their degree of resistant. The leaves of selected teak clones showed gradual increase in moisture contents in relation to leaf area consumption.ennullThesis