Starks, K.J. and Wood, E.A. Jr and Burton, R.L. (1974) Relationships of plant resistance and Lysiphlebus testaceipes to population levels of the greenbug on grain sorghum. Environmental Entomology, 3 (6). pp. 950-952.
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Abstract
The density relations of Schizaphis graminum (Rond.) on resisant and susceptible grain sorghum and the interaction of Lysiphlebus testaceipes (Cress.) was studied in field cages in Oklahoma. A simulated early natural infestation of 450 female parasites/acre was compared to a simulated early release of an additional 2500 parasites/acre. The populations of Schizaphis in all cages increased for 4 weeks after infestation regardless of the presence of parasites or of plant resistance, but the increase was much more pronounced on susceptible plants. Resistant plants had about the same pattern of aphid dynamics regardless of the level of parasites; in contrast, susceptible plants with the high level of parasites had less than 20% of the peak number of aphids found when low levels of parasites were present and the decline in the aphid population started about a week earlier. The numbers of mummies on resistant plants were similar for treatments with low and high levels of parasites. However, treatment of susceptible plants with the high level of parasites in comparison with the low one produced a peak occurrence of mummies about a week earlier. Plant data at harvest supported the counts of the pest and parasite. In general, the results verified theoretical calculations by other workers, but they also demonstrated that plant resistance was more promising than the release of L. testaceipes as an alternative to insecticidal control of S. graminum on sorghum
| Item Type: | Article |
|---|---|
| Author Affiliation: | ARS, USDA, Department of Entomology, Oklahoma State University, Stillwater, OK 74074, USA |
| Subjects: | Plant Protection |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 17 Sep 2012 05:35 |
| Last Modified: | 17 Sep 2012 05:35 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/7917 |
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