EN
In 2007–2008 the number of Gastroidea viridula populations and the percentage of damaged surface of leaves of four common sorrel cultivars (Belwilski, Biva, Belleville, Lyoński) were determined. Correlation between the content of oxalates in leaves of sorrel with the feeding parameters of this pest were studied, too. Two sorrel cultivars (Belwilski and Lyoński) were damaged by G. viridula to the greater degree than other two cultivars (Biva and Belleville). In 2008 (June 18), the largest number of feeding adult insects (114 individuals per 1 m2 area) was recorded on cv. Belwilski. The number of feeding insects was smaller on the other two cultivars, i.e. 62 individuals on cv. Biva, and 51 on Belleville cultivar. A high and negative correlation between the total oxalate content in sorrel leaves and the value of leaf surface damaged by G. viridula was stated. The experiment proved that the higher content of soluble oxalates in leaves did not negatively affect the number of feeding adult beetles and the percentage of plants damaged by this pest.