Amarasinghe, L.D.Ganehiarachchi, G.A.S.M.2016-06-232016-06-232015Amarasinghe, L.D. and Ganehiarachchi, G.A.S.M. 2015. Lesson 22: Identify the types of insect pests and their damage, In: Practical Manual for GCE A/L Biosystem Technology Teachers. Ministry of Education and University of Kelaniya, Sri Lanka. 157-165 pp.978-955-4563-50-6http://repository.kln.ac.lk/handle/123456789/13663enLearning Object