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Title: HISTORY OF THE OCCURRENCE OF GREENBUG BIOTYPES IMPORTANT TO GRAIN SORGHUM

Author
item Kindler, Dean - Dean
item HARVEY, TOM - KANSAS STATE UNIVERSITY
item WILDE, GERALD - KANSAS STATE UNIVERSITY
item SHUFRAN, ROXANNE - KANSAS STATE UNIVERSITY
item SLODERBECK, PHILIP - KANSAS STATE UNIVERSITY

Submitted to: Biennial Grain Sorghum Research and Utilization Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 2/21/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Since 1975, resistant sorghum hybrids have been used to reduce damage by greenbugs. However, the success of managing greenbugs with plant resistance has been challenged by the occurrence of resistance-breaking biotypes. Known field-occurring biotypes recognized as seriously damaging to sorghum are C, E, and I. Biotype C was the first biotype considered a major pest of fsorghum. Biotype E replaced biotype C in the 1980s, when it was found to b virulent to sorghum hybrids resistant to biotype C. Biotype I, which is virulent to the sorghum hybrids resistant to biotype E, appears to be gradually replacing biotype E in the field. In 1995, biotype K, which damages sorghum resistant to biotype I, was identified in a greenhouse colony originating from wheat collected in Haskell County, KS, in April 1992, and maintained on susceptible sorghum in the greenhouse. Field samples of greenbugs were collected from wheat and sorghum in Kansas and Oklahoma from 1996 to 1998. Biotype K was identified in samples collected from 11 counties in Kansas and 10 counties in Oklahoma during the sampling period. The documentation of biotype K in field samples is important information since commercial grain sorghum hybrids resistant to biotype I, but susceptible to biotype K, are being developed. There is a need to identify biotype K-resistant germplasm in biotypes are to be managed by greenbug-resistant hybrids.