2011-05-272011-05-271993https://hdl.handle.net/10365/17183E-493(Revised)NDSU Agriculture and University Extenson: Creative Commons Licensing Deed (http://creativecommons.org/licenses/by-nc-sa/3.0/)Grain.Food crops.Insect pests.Aphid management in small grains, corn and sorghumE-493 rev