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1 April 2013 Effect of Time and Testing Method in Determining St. Augustinegrass Resistance to Southern Chinch Bugs (Hemiptera: Blissidae)
Long Ma, Huangjun Lu, Ron Cherry, Heather McAuslane, Kevin Kenworthy
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Abstract

St. Augustinegrass, Stenotaphrum secundatum (Walt.) Kuntze, is used as lawn grass throughout the southern United States for its wide adaptation to varying environmental conditions. The southern chinch bug, Blissus insularis Barber, is the plant's most damaging insect pest. Host plant resistance of St. Augustinegrass has been determined in numerous studies using various techniques. However, efficacy of these various procedures in determining St. Augustinegrass resistance to southern chinch bug has not been determined. The objective of this study was to determine the effect of time and methodologies in assesing St. Augustinegrass resistance to southern chinch bugs. Four varieties were tested for resistance using 4 methods (bag, jar, box, tube) and 5 time intervals to measure chinch bug mortality. Overall, survival was greater in whole-plant methods (box and tube) than excised stolon methods (bag and jar). The bag test gave the most erratic results of the 4 methods. The effect of time in determining resistance was also evident. In our tests, it was clear that shorter time intervals in measuring mortality may result in not measuring resistance in a variety. In summary, researchers should carefully consider method, time and temperature as important variables in determining St. Augustinegrass resistance to southern chinch bugs.

Long Ma, Huangjun Lu, Ron Cherry, Heather McAuslane, and Kevin Kenworthy "Effect of Time and Testing Method in Determining St. Augustinegrass Resistance to Southern Chinch Bugs (Hemiptera: Blissidae)," Journal of Entomological Science 48(2), 161-165, (1 April 2013). https://doi.org/10.18474/0749-8004-48.2.161
Received: 10 September 2012; Accepted: 1 October 2012; Published: 1 April 2013
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