The study on extensive survey of wheat stores in Semi-Arid Eastern Plain of Rajasthan (India) revealed the insect pest species, Rhyzopertha dominica (Fab.), Tribolium castaneum (Herbst), Trogoderma granarium Everts, Sitophilus oryzae (L.) and Sitotroga cerealella (Ol.). The bioecological studies revealed that reproduction and survival rate of lesser grain borer, R. dominica was maximum at 301 C temperature and 755% R.H., whereas, minimum at 40 1 C temperature and 655% R.H. No grain damage was revealed when wheat grain was treated with margosa leaf and seed kernel powder 5% each, and margosa...