Disease resistance is often defined as reduction of pathogen growth on or in the plantit denotes less disease development in a genotype than that in the susceptible variety and is a relative . Plant breeding for disease resistance plant breeders emphasize selection and development of disease resistant plant lines plant diseases can also be partially controlled by use of pesticides and by cultivation practices such as crop rotation tillage planting density disease free seeds and cleaning of equipment but plant varieties with inherent genetically determined disease resistance . Specialisation molecular plant breeding and pathology molecular approaches to analyse and change qualitative and quantitative traits in cultivated plants are highly effective to improve yield and quality of food and renewable resources disease resistance and abiotic stress tolerance. Pathogen population genetics and breeding for disease resistance contributed by this approach to monitoring pathogen populations has been tremendously valuable in the development and deployment of host resistance andrivon and de vallavieille pope 1993 roelfs 1985 wolfe and limpert 1987 and has provided important insights into the
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