P.K. Sehgal (b-1980) completed his M.Sc Zoology/Entomology in 2004 and done Ph.D Zoology/Entomology in 2008. He has 18 instant notes and 13 books, 19 Research Papers to his credit. At Presently he is working as Assistant Professor in the Department of Zoology/Entomology at Dolphin (P.G.) Institute of Biomedical and Natural Sciences, Dehradun, Uttarakhand, India. The books run like wild fair from city to city, state to state and crossed the frontier of the country. This book is helpfull for B.Sc Agricultural student for fundamental knowledge of Entomology. Several books for undergraduate and postgraduate students and competitive examination of state and National level followed in quick succession. The Language is simple, explanation are clear and presentation is very systematic.