Studies on the use of wheat cultivar mixtures for the control of leaf rust /
| Main Author: | |
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1989.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Abstract: | Three different experiments involving winter wheat cultivar mixtures were conducted at McGregor, Texas in the 1986-87 and 1987-88 growing years. The same experiments were also conducted during 1987-88 at Dallas, Prosper, Stephenville, and Uvalde, Texas. The objectives of the experiments were (1) to determine the effectiveness of cultivar mixture in reducing severity of leaf rust (caused by Puccinia recondite Rob. Ex Desm.); (2) to compare the grain yield of cultivar mixtures to that of the component cultivars grown as purelines; (3) to determine the virulence structure of P. recondite in mixtures and component purelines; and (4) to determine if leaf rust severity could be remotely assessed in cultivar mixtures and purelines. Results indicated that cultivar mixtures could significantly reduce leaf rust severity and area under the disease progress program curve (AUDPC). There was a mean reduction in AUDPC of 32% in the mixtures compared to the mean AUDPC of the component cultivars. The AUDPC in the mixtures was always less than that of the most susceptible component grown in a pure stand. Mixtures equaled or bettered the mean grain yield of their component cultivars in 68% of the cases. The reduction in leaf rust in mixtures was better expressed in higher thousand kernel weights than in overall grain yield.. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Plant Pathology." |
| Physical Description: | ix, 84 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |