Jofrey M. Oleke, Victor Manyong, and Djana Mignouna
International Institute of Tropical Agriculture, Tanzania
Aida Isinika and Khamaldin Mutabazi
Sokoine University of Agriculture, Tanzania
Rachid Hanna
International Institute of Tropical Agriculture, Cameroon
Maurice Sabelis
University of Amsterdam

The coconut mite, Aceria guerreronis Keifer, has been identified as one of the pests that pose a threat to the coconut industry in Benin using a standard economic surplus model. The study presents the simulation results of the economic benefits of the biological control of coconut mites in Benin. In the least optimistic scenario, the economy would derive an overall net-gain of US$155,213.40. Considered at a discount rate of 12% for the period 2008-2027, net present value was about US$207,721, while the internal rates of return or break-even discount rates are high at 13.21%. It is therefore recommended that contemporaneous with the release of natural predators of the coconut mite, plans should be underway for improving research and extension services to coconut farmers in Benin.

Key words: Aceria guerreronis, biological control, Benin, exante economics, Tanzania.