Cotton boll mycoflora from Sudan
- 15 Downloads
Flower pedicels, more contaminated with moulds than cotton boll apices, contributed to the infection of the cellulose-rich locks. Similar to the total number of contaminants recovered from all boll segments, locks mycoflora was also significantly enhanced with boll age. Number of isolates from Gezira consistently conformed with changes in atmospheric relative humidity attaining a maximum in the 4th week following flower opening. Locks from the relatively dry and hot Shambat area exhibited an inconsistent mycofloral development although they collected 6.3% more infection than those picked from Gezira. An insignificant correlation between boll age and either pedicel or boll apex ifection was recorded. The relatively humid Gezira not only stimulated greater mould isolates (49.4% over Shambat's), but provided for 52.3% more infected boll apices over Shambat's.
Twenty fungal genera and species, 90% of which were cellulolytic (2), were recovered from 1–7 week-old green bolls. Aspergillus nidulans and Cladosporium herbarum unintermittently persisted throughout the sampling duration. Abundance of these two contaminants insignificantly matched with either boll age or sampling area. Eurotium was first record to native lint.
KeywordsRelative Humidity Aspergillus Sampling Area Sudan Flower Opening
Unable to display preview. Download preview PDF.
- 1.Abdalla, M. H. & El-Tayeb, N. M., 1980. Preliminary survey of cotton flower mycoflora from Sudan Gezira. Transactions of the British Mycological Society (in the Press).Google Scholar
- 2.Abdalla, M. H. & El-Tayeb, N. M., 1981. Implication of fungi in the loss of strength of Sudanese cotton fibre. The Journal of the Univ. of Kuwait (Science) (in the press).Google Scholar
- 3.Abdalla, M. H. & El-Tayeb, N. M., 1981. Spoiloge of stored cotton fibre from Sudan Gezira. Mycopathologia (in the press).Google Scholar
- 4.Ashworth, L. J., Rice, R. E., McMean, J. L. & Brown, C. M., 1971. The relationship of insects to infection of cotton bolls by Aspergillus flavus. Phytopathology 61: 488–493.Google Scholar
- 5.Bagga, H. S. & Ranney, C. D., 1969. Boll rot potential organisms involved and actual boll rot in seven cotton varieties. Phytopathology 59: 255–256.Google Scholar
- 6.Baher, L. F. & Pinckard, J. A., 1970. Histological studies on the mode of penetration of boll rotting organisms into developing cotton bolls. Phytopathology 60: 581 (Abst.).Google Scholar
- 7.Caquil, J. & Ranney, C. D., 1967. Studies on internal infection of green cotton bolls and the possibility of genetic selection to reduce the incidence of boll rot. Miss. State Univ. Tech. Bull. 54: 24 (cited by Sparnicht & Roncardori, 1972).Google Scholar
- 8.Huston, B. R. & Garber, R. R., 1959. A lint rot of cotton in California caused by Nigrospora oryzae. Plant Disease Reporter suppl. 259: 233–235.Google Scholar
- 9.Jazewski, A. A., 1929. Some diseases of cotton fibre. Microbial Journal 9: 159–167.Google Scholar
- 10.Luke, W. J. & Pinckard, J. A., 1970. The role of bract on boll rot of cotton. Cotton Growing Review 49: 20–28.Google Scholar
- 11.Roncardori, R. W., 1969. Fungal invasion of developing cotton bolls. Phytopathology 59: 1356–1358.Google Scholar
- 12.Roncardori, R. W., 1972. Evaluation of various control measures for cotton boll rot. Phytopathology 65: 567–570.Google Scholar
- 13.Sparnicht, R. H. & Roncardori, R. W., 1972. Fusarium boll rot of cotton. Pathogenicity and histopathology. Phytopathology 62: 1381–1386.Google Scholar
- 14.Stands, I. E., Fiori, L. A. & Groves, N. H., 1962. The utilization of Diplodia — damaged boll — rot cotton. Part 1. Effects on yarn properties and spinning efficiency. Textile Research Journal 32: 1013–1022.Google Scholar
- 15.Wiles, A. B., 1963. Relation of seed-borne fungi to boll rots of cotton, Phytopathology 53: 984.Google Scholar