Barley (Hordeum vulgare) is a herbaceous annual crop from the grass family (Poaceae). It has been known as a culture for about seven thousand years in Egypt, and in some other countries for about five thousand years. Today, barley is produced on about 50 million hectares in the world, and the average yield is 2.3 tons per hectare. About 50,000 ha of barley are sown annually in Croatia, and its average yield is 3 t / ha. According to the time of sowing, it is divided into winter and spring, and according to the purpose into brewing (two-row) and cattle (six-row and four-row). When growing barley, it is necessary to monitor the growth and development of the crop and the appearance of harmful organisms, and to implement the necessary protection in time to prevent a reduction in yield. This final paper describes barley as a crop, its cultivation and harmful organisms and measures to control them. During the monitoring of spring barley crops on the Cvitković family farm in 2021, weeds were observed while diseases and pests were not present. The protection program was implemented only for weeds. The aim of the final work is, based on regular inspections, to monitor the occurrence of harmful organisms during the cultivation of spring barley on the family farm Cvitković in 2021 and to describe the implemented methods of their control.