Races of Xanthomonas campestris pv. malvacearum (Smith) Dye, the Causal Organism of Bacterial Blight of Cotton, in Nigeria

Abstract

Races 6, 7 and 10 of Xanthomonas campestris pv. malvacearum (Smith) Dye, the causal organism of bacterial blight of cotton, were identified among twelve isolates of the pathogen from the three cotton growing zones of Nigeria. Races 7 and 10 were, however, predominant. The races were distinguished by inoculation of eight cotton lines known to differentiate through possession of different resistance genes. Further work is necessary, on a much greater number of isolates, to determine therange and distribution of different virulence types in Nigeria.

Field bioefficacy of mahogany seed extract (Khaya senegalensis: meliaceae, (desv.) a. juss) for management of bollworm infestation on cotton in Zaria, Nigeria

“…Cotton is an important cash crop of considerable social and economic importance in Nigeria, cultivated for its fibre and oil. It is mainly grown in the Savanna region of the Northern States in the areas extending from latitude 7 0 N to 13 0 N under rain-fed (Poswal, 1988) [19] . In cotton production, there are many factors that can reduce yield.…”

Identification of Novel Physiological Races of Phytophthora capsici Causing Foliar Blight Using the New Mexico Recombinant Inbred Pepper Lines Set as a Host Differential

“…The first host differential was reported by Barrus (1911), in which several races of anthracnose (Colletotrichum lindemuthianum) were identified using different bean (Phaseolus vulgaris) cultivars. Since that report, a range of host differentials has been used to successfully characterize physiological races in other crops (Andrie et al, 2006;Cho and Goodman, 1979;Dutta et al, 1960;Irish et al, 2007;Poswal, 1988). Currently, in soybean (Glycine max), more than 50 physiological races of Phytophthora sojae have been reported using a host differential (Bhattacharyya et al, 2005).…”