Species of the generaEretmocerusandEncarsia(Order: Hymenoptera, Family: Eulophidae) are parasites of the bandedwing whitefly,Trialeurodes abutilonea(Haldeman) in Louisiana cotton and soybean agroecosystems. In the order of their prevalence, they are:Eretmocerus haldemaniHoward,Encarsiaspecies (undescribed),Encarsia quaintanceiHoward, and EncarsiapergandiellaHoward.E. haldemaniis the predominant species both in cotton fields and in other host crop fields within cotton producing areas, accounting for ca. 70% of all parasites. Pupal parasitism was lower in cotton than other crop fields.Insect predators of the whitefly in Louisiana are as follows:Coleomegilla maculatalengiTimberlake,Coccinella novemnotataHerbst,Hippodamia convergensGuerin-Menaville,Olla abdominalis(Say),Delphastis pusillusLeConte;Geocoris punctipes(Say),Orius insidiosus(Say); species of Chrysopidae and Hemerobiidae; andNabisspecies. Mixtures of broad spectrum insecticides such as methyl parathion, toxaphene and DDT used in cotton fields for the control of boll weevil andHeliothisspecies were extremely harmful to both parasites and predators ofT. abutilonea.