Coffee berry borer population on the arabica coffee beans from three different cropping patterns in Karo, North Sumatera

Abstract The coffee berry borer or CBB ( Hypothenemus hampei ) is a critical pest overgrowing on plants. This study was conducted to find out the intensity of infestation. method based field primarily from direct observations populations in sampling used systematically calculate population plantations, with sample 50 plants repeated three times for each type cropping pattern. In observation plants, four samples branches were taken according cardinal direction densest branches, and infested berries separated color observe it. Yield loss due infestation Karo District around 30-40%. Based observational data obtained up 10th observation, highest found plant fields monoculture pattern 0.55%, polyculture (coffee - vegetable) 0.43%, citrus) by 0.24%. Plant spacing could affect presence CBB, (coffee–citrus) cultivation advised since it has lowest rate CBB.