The causes of premature nut fall of coconut palms in Nigeria were investigated. Coconut palms (Chowghat Green Dwarf (Indian), Malayan Yellow Dwarf and Malayan Red Dwarf were surveyed between May to August 2003.The primary cause of nut fall was identified as the attack of mite, Aceria (Eriophyes) guerreronis Keifer in the perianth. All three ecotypes examined were infested with a mean mite population of 187.94 ± 17.92 mites per nut. Mealybugs (Pseudococcus sp.) and some unidentified mites were also recorded. The role of these mites in the incidence of premature nut fall of coconut palms is discussed in this paper.