AN APPROACH TO THE INTEGRATED MANAGEMENT OF THE TANNIA RAPID YELLOWING DISEASE

Pattanjalidial,, H. Adams and A. Clarke

No 261479, 21st Annual Meeting, September 8-13, 1985, Port of Spain, Trinidad and Tobago from Caribbean Food Crops Society

Abstract: Tannia, Xanthosoma spp. (L.) Schott, is a staple root crop in the humid tropics. In the East Caribbean, the crop is also of great survival and economic value to the largely subsistence farming population, amidst the constant threat of hurricanes. The crop is susceptible to Tannia Rapid Yellowing Disease (TRYD), especially in Dominica and St. Lucia. The disease is caused by the fungus, Pythium myriotvtum Drechsl, It is prevalent in poorly drained locations and particularly affects the desirable, smooth-skinned, white or purple-fleshed cultivars, It is spread through the use of infested planting material and perpetuated in fields with volunteer, diseased host plants. A rough-skinned, whitefleshed tannia cv of limited marketability is tolerant to TRYD. The eddoe, Colocasia esculente, is resistant. The use of fungicides, including metalaxyl, cultural practices, combined with host plant resistance, are suggested for the integrated management of the disease. In the long term, joint efforts with existing breeding programmes for resistance to the disease are recommended. ----- EI ocumo, Xentbosome spp (L.) Schott, es un tubeiculo alimenticio de importancia en el tr&'pico humedo. En el Caribe Oriental, este cultivo es tambien de gran valor econdmico y de sobrevivencia para la poblaci6n agriC'&la marginal. la cual se encuentra en constante amenaza de incidencia de huracanes. EI cultivo es susceptible a la enfermedad del Amarillamiento Rapido del Xanthosoma spp. (TRYD) especialmente en la isla de Dominica yen la de St. Lucia. La enfermedad es causada por el hongo Pythium myriotylum Drechsl. Este es predominante en lugares con pobre drenaje y afecta particularmente a los cultivates de d(scara lisa y de color blanco 0 morado, los cuales tienen mayor demanda. La enfermedad se disemina mediante el uso de material de plantlo infectado y perpetuado en campos con plantas voluntarias-huespedes. La Xanthosoma spp cv, blanca y con cascara rugosa y de mercadeo limitado, es tolerante ala enfermedad TRYD. La colocssie esculents, es resistente a dicha enfermedad. El uso de fungicidas, incluyendo el rnetalaxyl, y las formas de cultivo combinadas con plantas huespedes, son las practicas sugeridas para el manejo integrado de la enfermedad. A largo plazo se recomienda, la practica de esfuerzos mutuos con programas exsistentes de mejoramiento genltico.

Keywords: Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies (search for similar items in EconPapers)
Pages: 5
Date: 1985-09-08
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Persistent link: https://EconPapers.repec.org/RePEc:ags:cfcs85:261479

DOI: 10.22004/ag.econ.261479

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