Muhammad Nor Al assaf(1)*, Muhammad shafik Hakim(2), Abdullatef ALassaf(2), Abdulla ALyossef (2)
- Center of scientific agriculture research of Aleppo, Aleppo, Syria.
- Dept. of Field Crops Faculty of Agriculture, University of Aleppo
(*Corresponding author: Muhammad al assaf, E-Mail assafnoor57@gmail.com.).
Abstract
The study was carried out at Humiema Research Station of Center of scientific agriculture research of Aleppo, during the growth season (2018/2019), aim at study effect genetic resistance, Sowing date and Chemical control of yellow rust caused by ( Puccinia striiformis Westend. f. sp. tritici) for some yield characters of bread wheat under natural infection conditions of pathogen population. Nine released cultivars of bread wheat (Cham10, Bohoth10, Cham6, Doma2, Doma6, Bohoth6, Cham8, doma4, Jolan2), resistant line ( Avocet Yr15) and susceptible cultivar( Morocco) were planted at two dates, with interlude twenty days with three replication according to randomized complete block design. The experience at second date was divided into sections: the first section was untreated where systematic fungicides for control of yellow rust treated the second section.
The study showed the importance of genetic resistance of two genotypes (Avocet Yr15, Doma6) in protecting number of grain / spike, grain weight / spike and 1000-grain weight characters and average coefficient of infection (ACI) reduced under natural infection conditions of yellow rust without need chemical control, whereas previous yield traits were affected significantly in susceptible varieties. The study showed that yield characters were effected with sowing dates and the most loss percentage was in susceptible varieties as Cham6 where the loss percentage was (56.1%) in grain weight / spike with increased average coefficient of infection up to (60). In addition, the study showed length spike was not effected with chemical control grain weight / spike and 1000-grain weight were significantly increased in susceptible varieties.
Keywords: yellow rust, bread wheat, resistance, sowing date, chemical control
Full paper in Arabic: pdf