Abstract: Tricyclohexyl tin hydroxide is very effective control newly hatched larvae, nymphs and adults of T.urticue.The ovicidal activity is very low at low dosage. However, it is very effective in killing the newly hatched larvae by residual contact action. Tricyclohexyl tin hydroxide is very effective control the haw red spider mite, the European red spider mite,and the citrus red spider mite, when a diluent of 20% formulation(2000 times by water)is sprayed in orchard.lt showed satisfactory residual activity in field test. Lasting effect were 90% after application 30 days.

Key words: Acaricide, Tricyclohexyl tin hydroxide, Red spider mite