10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 3 2013 (July - September) Neem oil is used in manufacturing of insecticide, because it contains lessThan i greaterThan Azadirachtin lessThan /i greaterThan which affect over six hundred species of pests. It is completely safe to non-target organisms. lessThan i greaterThan Azadirachtin lessThan /i greaterThan acts as a famous natural anti- feedent, growth regulator and ovipositional repellent against insects, which makes it useful as a perfect alternative to chemical pesticides. The present investigation carried out on the biological effects of neem oil to control the lessThan i greaterThan Pericallia ricini lessThan /i greaterThan . Neem oil plays on important role in evolving on ecologically and environmentally acceptable disease management system. Neem oil affects both the feeding and growth rates of lessThan i greaterThan Pericallia ricini lessThan /i greaterThan . The results recorded in the present study that neem oil was less economic, less hazardous to the environment and it was effective to control the lessThan i greaterThan P. ricini lessThan /i greaterThan pest. M.VIKRAM SIVASAKTHI, S. DHANASEKARAN AND K. MANIMEGALAI Neem oil, castor leaves, Pericallia ricini and Azadirachtin. 259-263