PATEL, H. K.PATEL, MAGANLAL A.2018-05-172018-05-171983http://krishikosh.egranth.ac.in/handle/1/5810046422studies on the assessanent of inherent vulnerability o£ various high yielding wheat varieties (J-l-7, J-18, J-24, J-40, RAJ-911, Lok-1, WH-147, A-28, A-206 Kalyansona and Sonalika popularly grown in Gujarat State) to post harvest infestation by T. granarium and R. dominica were conducted at twelve combinations of temperature (25°, 30° and 35°C) and relative humidity (45, 60, 75 and 85 per cent) during 1980-82 at Anand (Gujarat). The studies revealed that maximum number of eggs were laid at 35°C temperature and 60 per cent relative humidity and 30°C temperature and 75 per cent relative humidity by T. granarium and R. dominica respectively. Poor oviposition was observed at 25 °C temperature and 45 per cent relative humidity by T. oranarium and at 25° or 35°C temperature and 45 per cent relative humidity by R. dominica. Rich oviposition was recorded in Sonalika, J-24, Lok-1 and J-40 by T. granarium and in RAJ-911, J-40, J-1-7, J-18, Kalyansona and sonalika by R. dominica. The temperature of 35°C was found quite optimum, while relative humidity of 60 per cent and 75 per cent respectively was found highly suitable for the growth and development of T. granarium and R. dominica. Wheat varieties Sonalika, Kalyansona, J-1-7 and J-18 were highly preferred and A-206 and A-28 were least suitable for the growth and development of both the insects. At 25°C temperature none of the larvae of T. granarium pupated even after five months. Studies on relative susceptibility of wheat varieties showed that Sonalika was the most susceptible and A-28 and A-206 were the least susceptible to the attach of both the insects. The observations on correlation between the pitysicochemical values of the variety and the level of susceptibility indicated that there was a positive correlation between protein and gluten content of a variety and level of susceptibility to T. granarium. Similarly positive correlation was observed between gluten content and level of susceptibility to R. dominica. Negative correlation was found between the pelshenke value and level of susceptibility to R. dominica. The loss in weight in different varieties due to T. granarium and R. dominica at optimum environmental conditions ranged from 1.52 to 18.93 and 3.40 to 27.18 per cent respectively. Maximum and minimum weight loss was observed in Sonalika and A-28 varieties respectively. Weight loss in each variety was related to the size of the insect population that developed in the variety. Studies on loss in viability Showed that with the increase in the infestation period by both the insects increase in loss in viability was observed in all the varieties. After 35 days of infestation by both the pests significant loss in viability than the normal germination was observed in almost all the varieties except A-28.enAGRICULTURAL ENTOMOLOGY, AGRICULTUREASSESSMENTThesis