BIOLOGY AND CONTROL OF CLAVICEPS PURPUREA (FR.) TUL. ON MALESTERILE WHEAT AND BARLEY
| dc.contributor.advisor | MATHRE, DONALD E | |
| dc.contributor.author | PURANIK, SHIVAYOGI BASAYA | |
| dc.date.accessioned | 2019-04-05T07:55:56Z | |
| dc.date.available | 2019-04-05T07:55:56Z | |
| dc.date.issued | 1970 | |
| dc.description.abstract | The seriousness of ergot caused by Claviceps purpurea (Fr.) Tul. in male sterile barley and wheat has prompted further study of the biology of this pathogen. For evaluation of various control measures, a technique of Inoculation was developed and involved the removal of the upper 2 - 4 mm of the glumes prior to inoculation with a conidial suspension using an atomizer. Use of this technique resulted in n e a r ly 100% head and floret infection whereas previously described methods resulted in 2 0 - 6 0 % head infection. Studies on inoculation density revealed that maximum infection occurred with 105 or more conidia per ml. Studies on duration of infection period of unfertilized and fertilized ovaries indicated that inoculation during and shortly after anthesis resulted in the highest levels of floret infection Resulted in the highest levels of floret infection. With unfertilized florets, susceptibility declined at 10days and was lost Completely 15days after the initiation of an thesis. Fertilized Ovaries were susceptible right after fertilization. After the ovaries Had been fertilized for 4days susceptibility decreased until no infection Occurred 9days after fertilization .Many chemicals were Screened for their effectiveness in inhibiting germination and growth Of C. purpurea. Benomyl at 10ppm inhibited germination of conidia While growth was completely inhibitedat 20ppm. Under field cond Itions using male sterile barley, 2400ppm benomyl applied three Times just prior to and during anthesis gave some control of ergot. To determine why economy did not give complete control various conentrations of benomyl were applied to florets with the upper portion of their glumes removed which had been previously inoculated with C. purpurea. Using this method, floret infection was reduced from 94% to 11% with 1000ppm benomyl and to 0% ,if a wetting agent such as Triton X-77 or Multifilm Buffer X was used along with 1000ppm benomyl. This Indicated that benomyl must reach the surface of the ovary at or before Infection to be effective since benomyl did not act as an eradicant Against this pathogen. | en_US |
| dc.identifier.citation | No . of references 57 | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810100550 | |
| dc.keywords | PLANT MATERIAL, INOCULATION TECHNIQUE, HONEY DEW EXTRACT, CHROMATOGRAPHY, POISON FOOD TESTS | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 79p. | en_US |
| dc.publisher | UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE | en_US |
| dc.research.problem | BIOLOGY AND CONTROL OF CLAVICEPS PURPUREA (FR.) TUL. ON MALESTERILE WHEAT AND BARLEY | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.subject | null | en_US |
| dc.theme | BIOLOGY AND CONTROL OF CLAVICEPS PURPUREA (FR.) TUL. ON MALESTERILE WHEAT AND BARLEY | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | BIOLOGY AND CONTROL OF CLAVICEPS PURPUREA (FR.) TUL. ON MALESTERILE WHEAT AND BARLEY | en_US |
| dc.type | Thesis | en_US |