Hymenopterous parasites of biotype C greenbug in the high plains of Texas

Walker, A.L. and Bottrell, D.G. and Cate, J.R., Jr. (1973) Hymenopterous parasites of biotype C greenbug in the high plains of Texas. Annals of the Entomological Society of America, 66 (1). pp. 173-176.

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The Braconid, Lysiphlebus testaceipes (Cress.) was the major primary parasite attacking Biotype C of Schizaphis graminum (Rond.) on grain sorghum, johnsongrass [Sorghum halepense], barley, wheat, oats and rye in the High Plains of Texas in 1970. Other parasites reared from mummies of S. graminum collected on one or more of these food-plants were the Braconid Diaeretiella rapae (M'Intosh), a primary parasite, and the Hymenopterous hyperparasites Charips sp., Pachyneuron siphonophorae (Ashm.), Asaphes lucens (Prov.) and Aphidencyrtus aphidivorus (Mayr). S. graminum is apparently a new host record for D. rapae. Another apparently new parasite record for S. graminum is that of the Eulophid Tetrastichus minutus (How.), which is probably a secondary parasite. It was not recovered in the High Plains, but it emerged from collections of parasitised S. graminum collected on grain sorghum in Hunt County, Texas. Seasonal parasitism, as determined by the appearance of mummies in the population of S. graminum on untreated grain sorghum, was a delayed density-dependent action; that is, the percentage parasitism by primary parasites reached its maximum (100%) about 4 weeks after the population of S. graminum had reached its peak. A large percentage of the mummies infested with primary parasites did not produce the adults of these parasites, however, because of the attack by hyperparasites, primarily Charips sp. and P. siphonophorae

Item Type: Article
Author Affiliation: Texas Agricultural Experiment Station, Texas A&M University Agricultural Research and Extension Center, Lubbock, Tex. 79401, USA
Subjects: Plant Protection
Divisions: Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 02 Jul 2012 10:57
Last Modified: 02 Jul 2012 10:58
URI: http://eprints.icrisat.ac.in/id/eprint/6448

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