Parasitism of aphids (Homoptera: Aphididae) associated with Texas sorghum

More than 7,700 greenbug and nearly 2,200 corn leaf aphid mummies were collected from sorghum grown in the six vegetational regions of Texas. Adult parasites emerged from 5,635 of the collected greenbug mummies and 1,468 of the collected corn leaf aphid mummies. Of the mummies producing adult parasites, 4,040 resulted in three species of hymenopterous primary parasites, Lysiphlebus testaceipes (Cresson) and Diaeretiella rapae (M'Intosh) (Braconidae), and Aphelinus varipes (Foerster) (= A. nigritus Howard) (Aphelinidae). The remaining 3,064 emerged adults represented five species of hymenopterous hyperparasites, Pachyneuron siphonophorae (Ashmead) and Asaphes lucens (Provancher(Pteromalidae), Alloxysta sp. (megourae complex) (Cynipidae), Aphidencyrtus aphidivorus (Mayr) (Encyrtidae), and Tetrastichus minutus (Howard) (Fulophidae). The survey did not recover any of the six species of exotic greenbug parasites previously imported from Europe and released in Texas or Oklahoma.