The cherry trees are one of the highly widespread orchards in Bulgaria. They grow in the most regions of the country, but the optimum conditions are got in the Kyustendil, Plovdiv, Pazardjik, Sliven, Stara Zagora and Burgas. Investigation of the relationship between main stages of development of the cherry and sum of active temperature (ΣTa>0) collected during these periods are present for eight station - Blagoevgrad, Dupnitsa, Kyustendil, Chirpan, Karnobat, Dobrich, Targovishte and Lovech for the period 1992 - 2006. Finding of empirical relationships for long-range forecasts of the occur different stages from the cherry orchards development during a vegetative season in dependence of temperature conditions.
Phenological development forecasting of cherry trees (Prunus Avium L.) in Bulgaria