@INBOOK {LANGEWALD:1992, title = {Effects of neem oil treatment on the phase status of desert locust, Schistoccerca gregaria}, author = {Langewald, J. and Schmutterer, H. }, editor = {Lomer, C. and Prior, C. }, year = {1992}, type = {Biological control of locusts and grasshoppers}, pages = {142--154}, publisher = {CAB International}, address = {Wallingford, Oxon, UK.}, }