Bio-ecology, symptoms of damage and yield loss caused by the coconut eriophyid mite Aceria guerreronis Keifer are described. The pest continues to be a cause of concern in Asian countries causing high economic losses. Chemical pesticides are not considered safe to human and environment. Screening of 31 coconut genotypes and 34 hybrids for four years revealed four genotypes Chowghat Orange Dwarf (1.99), Spicata (2.41), Siam (2.50), British Solomon Island (2.5) and two hybrids [JGxECT (1.61) and CCxPHO (2.34)] significantly recorded minimum damage grade index due to mite and found to be moderately resistant. Further screening will be needed. Application of Borax (50 g) or calcium (1 kg) along with the NPK (0.56: 0.32: 1.20 NPK kg/palm/ year) and Farm Yard Manure (50 kg) registered low damage grade index (3.36 and 3.53) due to mite compared to control (4.28). The effect of different nutrients against mite damage in young bunches could not be realised significantly even after two years. Application of all four bio-fertilisers Azospirillum, Azatobacter, Phosphobacteria and J;;4.M endomycorrhiza in combinations registered less damage grade index (3.08) compared to control (4.30). Mite damage in young bunches was also less (79.54%) in treatment with all four bio-fertilisers as compared to control (85.52%) but the differences were not significant after one year. Keywords : Coconut, eriophyid mite, Aceria guerreronis