Abstract
Cassava (Manihot esculenta Crantz) includes a multitude of varieties different by several parameters, each of them with specific characteristics. Some of these varietal specificities may constitute the seat of an influence on the vulnerability of this plant to stresses. In this present study, we proposed to assess the impact of physico-chemical parameters of the cassava stem on its varietal sensitivity to termites ravaging cuttings Odontotermes sp. aff. erraticus in Senegal. At the end of experiments conducted in laboratory, we have seen that the cassava varieties in which the stem bark was thick and hard with a reduced diameter of the marrow were more tolerant to the action of these pests, while those with thin and fragile bark and large stem marrow were more sensible. However the pH of the cassava stem did not affect the incidence of attack of the cuttings by the termites. Key words: Cassava, cuttings, tolerance, physico-chemical parameters, Odontotermes sp.
Highlights
Cassava (Manihot esculenta) is a plant of the Euphorbiaceae family native to Latin America
We proposed to assess the impact of physico-chemical parameters of the cassava stem on its varietal sensitivity to termites ravaging cuttings Odontotermes sp. aff. erraticus in Senegal
A correlation could be established between the diameter of the cassava stem marrow and the number of termites extracted from cuttings
Summary
Cassava (Manihot esculenta) is a plant of the Euphorbiaceae family native to Latin America. It is grown mainly for its starchy tubers which constitute the basis of food and the main source of energy of many populations across the world (FAO, 1990). Cassava world production of was estimated in 200 at 184 million tons with 55% in Africa (FAO, 2000). It is a very undemanding plant in relation to the fertility of the soil, rainfall and cultural practices (Raffailac, 1993). With an annual production of about 90 million tons, cassava is the most important of the R & T (Roots and Tubers) in Africa.
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