Seven outbreaks of the gypsy moth in Serbia for the last seven decades were researched in relation to the solar activity cycles and the solar flux at 2.8 GHz. Based on data analysis, three types of outbreaks were selected. A–type includes the second half of the solar cycle. This type of the outbreak doesn’t get into the next cycle (the values of the solar flux at 2.8 GHz decrease in the final phases). Besides the final years of the solar cycle, B–type also includes the initial years of the next cycle. C–type appears in the beginning of the solar activity cycle. At B-type and C-type the interruption of the outbreak occurs while the solar flux at 2.8 GHz value is increasing. The outbreaks of A-type were: 1970–1976 and 2004–2007; B-type: 1952–1956, 1962–1966, 1984–1987 and 1995–1998; C-type: 2009–2014. The obtained results suggest that the gypsy moth outbreaks are caused by corresponding range of energy coming from the Sun.