Establishment of exotic parasitoids of the coffee berry borer Hypothenemus hampei (Coleoptera: Curculionidae: Scolytinae) in Colombia through farmer participatory research

Publication Type:Journal Article
Authors:L. F. Aristizabal, Salazar, H. M., Mejia, C. G., Jimenez, M., Bustillo, A. E., Arthurs, S. P.
Journal:International Journal of Tropical Insect Science
Date Published:Mar

A participatory project was conducted with small-scale coffee growers from Quindio Department, Colombia. In 34 coffee lots in three municipalities, growers implemented an integrated management programme against the coffee berry borer (CBB) Hypothenemus hampei Ferrari, based on improved cultural harvesting and sanitation practices (to remove breeding habitats) and releases of exotic parasitoids. Growers released over 10 million Cephalonomia stephanoderis and 5 million Prorops nasuta (both Hymenoptera: Bethylidae) over 2 years. Populations of the CBB declined from a range of 7-14% infested berries (Quimbaya), 10-13% (Montenegro) and 15-48% (Buenavista) prior to the integrated pest management programme, to an average of 2.1 [plus or minus] 0.2% infested berries in Quimbaya, 3.5 [plus or minus] 0.2% in Montenegro and 2.8 [plus or minus] 2.1% in Buenavista, over the following 25 months. Damage to parchment coffee similarly declined during this period. Six months after the final release of parasitoids had been made, we found both parasitoid species established in all three municipalities. However, P. nasuta were recovered more frequently (in 71.4% of lots where they were previously released) compared with C. stephanoderis (recovered in 30.8% of release lots). Average parasitism rates remained low, i.e. 3.7% for P. nasuta and 2.9% for C. stephanoderis. This low rate was probably due to the frequent manual removal of mature berries containing developing parasitoid larvae. In addition, the entomopathogenic fungus Beauveria bassiana was observed on average on 9.5% adult CBB in Montenegro, compared with mean infection rates of 4.3 and 4.4% in Quimbaya and Buenavista, respectively. Cultural harvesting and sanitation is an important component of CBB control, although it may limit the impact of the pest's parasitoids.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith