The experiment was conducted to evaluate the efficiency of monocrotophos at full (400m1/Feddan), half and quarter of the recom‌mended rate alone and in mixures with mineral oil, (misrona and kz-oil) and natural plant oil, (cotton seed oil) against thrips, Thrips [abaci on coton seedlings at Sakha, Agricultural research Station during 1997 cot‌ton growing season. Also two natural products, milbemectin and thiocy‌clam hydrogen oxalate, new insecticide acetamiprid as well as mineral and plant oil alone. The obtained results indicated insignificant differences in the effi‌ciency of monocrotophos between the recommended rate (400 ml.), and its half and quarer rates against thrips at 2 days after spraying (initial toxicity), i.e. 95.32, 92.80 and 92.73% reduction, respectively. On the other hand, significant differences in monocrotophos efficiency in insect population were found between the low rate and the other two high rates within 2 weeks after spraying. Adding of kz-oil, misrona and cotton seed oil to monocrotophos at the rate of 200 ml./Feddan did not contribute significantly on the in‌secticide the efficiency against thrips. On the contary, the mixtures of cotton seed oil and kz-oil to monocrotophos at 100 ml./Feddan gave additive to residual effect, where it was equitoxic to the monocrotophos at 200 ml./Feddan. Acetamiprid at 30gm. a.i/fed. caused percent reduction slightly less than monocrotophos at 200 ml./Feddan as initial or residual activity milbemectin, cotton seed oil and kz-oil exhibited moderate initial toxicity and low residual effect. On the other hand, misrona and thiocyclam hy‌drogen oxalate caused weak insecticidal activity in this respect.