00942nam a2200205Ia 4500 CTU_27201 210402s9999 xx 000 0 und d Sai ISBN ;38.81Dfl 632.9 E54 Helmut F van Emden Pest control and its ecology Helmut F van Emden Cambridge, New York Cambridge Univ. Press 1989 The book discusses how far chemical control has created problems and how far these may be solved by further chemical control or by alternative methods. The reasons why insects are pest problems are discussed so that the ecological merits and demerits of the various control methods can be assessed. Stress is laid on both the biotic and economic environments in which pest control has to operate pests control Minh, 981203 Trung tâm Học liệu Trường Đại học Cần Thơ