EN
Basing on results obtained in Department of Biochemistry, Agriculture and Pedagogic University (WSR-P) in Siedlce and recent literature data author describes biochemical parameters referring to processes of choice and acceptance of wintet wheat by cereal aphids. The results indicate that the high concentration of green chlorophyls and steam distillate extracts as well os low level of yellow flavonols make biochemical criterion for choice and acceptance of winter wheat by grain aphid Sitobion avenae F.