Abstract
Wheat production and grain quality increase in Serbia become more dependent of plant protectors linked with liberalization of assortment chose and simultaneous field owners structure changes. Forecasting model of grain yield losses based on parasite interaction effects and variety growth characters was necessary proposal as well as variety maturating time because of fungicides harvest restriction. Usefulness was founded in assortment formation throw time for particular variety change and single fungicide application during the resistant variety application. Method for superior genotypes chose also had to be corrected by forecasting model. Application of 13% higher yielding susceptible genotype from standard Pobeda obligated by treatment was defined as economic. In such direction, yield potential difference of new varieties with intermediate resistance to obligate parasites had to be at least 5%. The reduction of facultative parasites development and so toxin amount decrease could be achieved simultaneous.
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