Pale green sap sucking insects. Sucking sap from young shoot tips and secrete a toxic saliva that kills some of the plant cells in that area. Later as the leaves develop from the damage shoots these dead areas tear into many small holes. Damage can be seen from late spring to late summer. At first sign of plant damage treat with Provado Ultimate Bug Killer - Ready to Use/ Concentrate.
Cultural measures: In winter remove plant debris around affected plants, in summer remove weeds which harbour these pests.