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Published in Crop Sci 9:765-766 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Tolerance of Cynodon Clones to Phytotoxemia Caused by the Two-lined Spittlebug1

C. M. Taliaferro, D. B. Leuck and M. W. Stimmann2

A highly variable collection of 398 vegetatively propagated Cynodon accessions was screened for host-plant resistance to the two-lined spittlebug, Prosapia bicincta (Say). Clonal reaction to spittlebug attack ranged from slight to very severe injury at the end of 7 to 8-day test periods. Among the 398 clones, about 5% (19) were rated highly tolerant, 47% (189) intermediate in tolerance, and 48% (190) as very susceptible to spittlebug phytotoxemia. All of the clones could be severely injured by prolonged spittlebug infestation. The specific mode of action responsible for differential clonal response appears to be a tolerance mechanism which enables some genotypes to withstand the spittlebug toxin better than others. The wide range in clonal reaction to spittlebug attack, and the acceptable levels of tolerance found in these investigaions, offer hope that breeding methods can be used to increase the level of spittlebug resistance in bermudagrass.

Key Words: Bermudagrass • Insect resistance • Prosapia bicincta

1 Cooperative investigations of the Crops Research and Entomology Research Divisions, Agricultural Research Service, U.S. Department of Agriculture, and the University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton, Georgia. Journal Series Paper No. 490, University of Georgia College of Agriculture Experiment Stations.

2 Formerly Research Agronomist, Crops Research Division, (Presently Asst. Professor, Department of Agronomy, Oklahoma State University) and Entomologists, Entomology Research Division, respectively, Agricultural Research Service, U.S. Department of Agriculture, and the University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton, Ga.

Received for publication April 30, 1969.




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