Coffee berry borer

The adults are typically dark brown or black in color. There is a significant sexual dimorphism, where females are larger and capable of flight, while males are flightless and spend their entire life cycle inside the coffee bean.

The primary host for this pest is the coffee tree (Coffea spp.). The beetle specifically targets the reproductive organs, focusing on the fruits that are developing or reaching maturity.

The female bores a hole into the fruit, usually at the floral disc, to lay her eggs. As the larvae hatch, they feed on the endosperm of the coffee bean, rendering it useless for processing or commercial consumption.

This feeding behavior not only destroys the yield quantitatively but also ruins the quality, leading to lower prices and potential rejection of the coffee crop during international trade.

The seasonal appearance of the beetle is dictated by the phenological stages of the coffee crop. Infestations typically begin when the coffee berries reach the stage of high nutritional value for the developing larvae.

Given the short life cycle, which can be completed in about 25 to 30 days, the population can increase rapidly under warm and humid environmental conditions, typical for tropical coffee growing regions.

The most visible sign of infestation is the presence of tiny, circular entry holes in the coffee cherries, usually found near the fruit's navel. These holes are often accompanied by frass (boring dust) near the entrance.

Affected cherries may drop prematurely or turn necrotic. Opening the infested cherry reveals the characteristic tunneling damage within the bean, where adults and larvae can often be found.

Effective management relies heavily on strict phytosanitary practices, such as the complete removal and destruction of all fallen berries from the orchard floor after harvest to reduce the pest reservoir.

Chemical control is only effective during the short window when females are flying to find new berries. Once the beetle enters the bean, it is protected from most insecticides, making timing crucial.

Integrated Pest Management (IPM) strategies, including the use of pheromone traps and biological controls like specific entomopathogenic fungi, are highly recommended to keep populations below the economic injury level.