A species of Central American ant will kill coffee-bush pests if you give it the means to do so
wreak more havoc on coffee plantations than the berry-borer beetle. In Brazil alone its depredations are reckoned to cost $300m a year, so keeping the insects under control is a priority for plantation owners around the world. That is easier said than done. Berry borers spend most of their lives inside the berries. Their eggs hatch there. Their larvae feed, grow and pupate there. And their adults mate there.
Working with a team of colleagues, Dr Jimenez-Soto and Dr Morris studied a coffee plantation in Chiapas, Mexico. All of the coffee bushes there were growing under a canopy of shade trees, and some of these trees were cuaniquil. The researchers selected 20 sites, each separated from the others by at least ten metres, for their experiment. All included a cuaniquil that hosted an active ant colony and six coffee bushes that were not touching one another.
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