Abstract: Resistance to birdcherry aphid 〔Rhopalosiphum padi (L. ) 〕in 35 turfgrass varieties from 7 genera in Triticeae was studied. 15 high resistant , 3 middle resistant and 2 low resistant varieties were identified. Both creeping bentgrass and buffalograss have the best resistance and are in immune level . 4 of the 6 bermudagrass varieties are also immune from the pest . Resistance in tall fescue varieties varied from immune to low resistant and Kenturky bluegrass from high resistant to middle susceptible. Zoysiagrass exhibited low or middle susceptible resistance level . Ryegrass varieties , however , are all high susceptible to the pest . The analysis of the symptom and the correlation between aphid density and plant injury degree suggested that antibiosis and tolerance contribute to the resistance in turfgrasses to the insect .

Key words: Turfgrass, Rhopalosiphum padi (L. ), Insect resistance