Coffee’s natural insect repellent, caffeine, is usually enough to keep away most bugs. However, there is one bug that can beat the caffeine Jitters: the Coffee Berry borer bug. This bug is responsible for up to 80 percent of global coffee crop losses annually. The secret to their success? The microbes in their gut. These microbes live off of caffeine, breaking it down and using it for nutrition. Fortunately, we have other natural pesticides to keep our coffee crops safe from these bugs.