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Several species of double-stranded RNA (dsRNA) were found to occur in the cassava clone Secundina, which was thought to be virus- free. A large dsRNA molecule (6.6 x 106 Mr = relative molecular mass)(L-dsRNA) was shown to be graft, but not mechanically transmitted and occurred primarily in a nucl...


Gabriel, C.J.WALSH, R.Nolt, Barry L.[Evidence for a latent viruslike agent in cassava]Evidence for a latent viruslike agent in cassava

A survey of weeds and weeding practices was carried out by a team of agricultural economists and agronomists on 283 farms in 5 cassava-growing regions of Colombia at 3 times during a cropping season. From 71-78 percent of the weed species present were broad- leaved species. As cassava grew older,...


Doll, J.Pinstrup-Andersen, PerDíaz, R.O.[An agro-economic survey of the weeds and weeding practices in cassava (Manihot esculenta Crantz) in Colombia]An agro-economic survey of the weeds and weeding practices in cassava (Manihot esculenta Crantz) in Colombia

Aspects related to breeding programs in cassava, the impact of past strategies and exptl results related to them are discussed. Even though sources of resistance have been identified for the majority of the diseases and pests, in addition to tolerance to adverse edaphic and climatic factors, it i...


Lozano, J.C.Byrne, D.Bellotti, Anthony C.[Cassava/ecosystem relationships and their influence on breeding strategy]Cassava/ecosystem relationships and their influence on breeding strategy

The aim of the study was to investigate the chemical composition and pasting properties of 43 cassava mosaic desease (CMD) resistant clones planted at different locations (Ibadan, Onne and Mokwa) in Nigeria under rainfed conditions in 2003 and 2004. Ranges of chemical contents (%) were for amylos...


Sanni, L.O.Adebowale, A.A.Maziya-Dixon, B.B.Dixon, A.[Chemical composition and pasting properties of CMD resistant cassava clones planted at different locations]Chemical composition and pasting properties of CMD resistant cassava clones planted at different locations

Studies on the translocation of the causal agent of cassava bacterial blight (considered to be a biotype of Xanthomonas manihotis) within the host tissues showed that this pathogen moves mainly through the xylem tissue. The primary stem symptoms appear on the green portion of the stem, but their ...


Takatsu, A.Lozano, J.C.[Translocacion del agente causal del anublo bacterial de la yuca (Manihot esculenta Crantz) en los tejidos del hospedero]Translocacion del agente causal del anublo bacterial de la yuca (Manihot esculenta Crantz) en los tejidos del hospedero
Autor: Lozano, J.C.

Bacterial blight of cassava is a serious problem in Central and South America and has been observed in parts of Africa. Symptoms include leaf spotting, wilting, dieback, gum exudation on young shoots, and vascular discoloration in mature stems and roots of susceptible cultivars. Dispersal by rain...


Lozano, J.C.[Bacterial blight of cassava]Bacterial blight of cassava

The effect of fertilizer and mulch across tropic level of the cassava ecosystem, i.e. the plant, the cassava mealybug(CM), the wasp Apoanagyrus lopezi and its hyperparasitoids, was studied in two field experiments planted ins southern Benin. Several cassava cultivars with different branching patt...


Schulthess, F.Neuenschwander, P.Gounou, S.[Multitrophic interactions in cassava, Manihot esculenta, cropping systems in the subhumid tropics of West Africa]Multitrophic interactions in cassava, Manihot esculenta, cropping systems in the subhumid tropics of West Africa

People of Zaire prefer cassava mosaic virus-infected cassava leaves to the healthy leaves for vegetable use. The diseased leaves are believed to be sweeter and more tender. To investigate this claim, leaves from three cassava clones, TMS 50395, TMS 30572 and Isunikankiyan, with disease ratings of...


Almazan, A.Theberge, R.[Influence of cassava mosaic virus on cassava leaf vegetable quality]Influence of cassava mosaic virus on cassava leaf vegetable quality

Cassava (Manihot esculenta Crantz) provides the cheapest source of food calories in Africa and forms the major staple for roughly 40% of Africans. More than 200 million people in sub-Saharan Africa derive over 50% of their carbohydrate intake from cassava. It has been recognised as a powerful pov...


Kanju, E.Mkamilo, G.S.Mgoo, V.Ferguson, M.[Statistical evidence linking the zigzag stem habit with tolerance to cassava brown streak disease]Statistical evidence linking the zigzag stem habit with tolerance to cassava brown streak disease

Though often perceived as an environmentally-risky practice, biological control of invasive species can restore crop yields, ease land pressure and thus contribute to forest conservation. Here, we show how biological control against the mealybug Phenacoccus manihoti (Hemiptera) slows deforestatio...


Wyckhuys, Kris A.G.Hughes, A. C.Buamas, C.Johnson, AnneVasseur, LietteReymondin, LouisDeguine, J. -P.Sheil, D.[Biological control of an agricultural pest protects tropical forests]Biological control of an agricultural pest protects tropical forests

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