Incidence, carry-over and control of common scab Streptomyces scabies (Thaxter) Waksman and Henrici
| MSI99P0080 | |
| Ferré, P. Autrey, L. J. C. | |
| Incidence, carry-over and control of common scab Streptomyces scabies (Thaxter) Waksman and Henrici | |
| Autrey, L. J. C., Hunt, G. L. T., Govinden, N., Ferré, P. (eds)., Proceedings of the 2nd Triennial Meeting and Conference of the African Potato Association, Réduit, Mauritius, 23-27 July 1990 | |
| Book chapter | |
| 1991 | |
| p.79-85 | |
| Réduit, African Potato Association, MU | |
| En | |
| En Fr | |
| High levels of infection by common scab ranging from 58.4 to 78.2 per cent, on average 68.7 per cent, were found in the field in progveny issuing from locally produced seed variety Up to Date. Under the same conditions, the disease was practically absent in imported seed of the same variety. A similar trend was found in four other varieties, Sahel, Van der Plank, Dani and BP1. Under three different overhead irrigation regimes namely 37 mm at planting followed by rainfed conditions, 25 mm every six days and 37-50 mm every twelve days throughout the crop cycle, common scab infection in progeny of local seed Up to date was 41.2, 49.1 and 52.8 per cent respectively while in that of imported seed, infection reached a maximum of 2.4 per cent. In a pot experiment in sterilized medium in the glasshouse, progeny issuing from local mother tubers of Up to date without visible and with slight, moderate and severe lesions, had 62.8, 75, 54.5 and 66.7 per cent scabbed tubers respectively. Further glasshouse trials showed in progeny of tubers without visible and with moderate lesions, treated at planting with Mancozeb, infections were 9.5 and 22 per cent respectively while with Aretan treatment corresponding infection levels were 20.0 and 55.1 per cent compared to 58.2 and 61.5 per cent in untreated controls. Treatment of seed prior to planting with Mancozeb at 3 g per kg of seed by the paper bag method resulted in absence of scab or infection levels not eexceeding 1 per cent. It is concluded that the high level of common scab in progeny of local seed is due to seed borne infection rather than to physiological changes after cold storage and/or water stress at tuber initiation, as is the case elsewhere. Adoption of seed dressing with Mancozeb on a routine basis since 1983 has led to the practical absence of common scab in commercial fields of Up to date and other varieties in Mauritius. | |
| POTATOES STREPTOMYCES FUNGAL DISEASES DISEASES COMMON SCAB | |
| MAURITIUS | |
| Potatoes: Diseases and disease management | |
| Fungal diseases: Common scab | |
| 1991-12-12 | |
| En | |
| Mauritius Sugar Industry Research Institute | |
| LIB FC PATH | |
| CAT | |
| PATH |