Influence of agro-environmental factors on fusarium infestation and populationstructure in wheat kernels.
Tibor Rohácik 1, Kamil Hudec 2 1 - Research and Breeding Institute Inc., Bucany, Slovak Republic. 2 - Ann Agric Environ Med 2005; 12 (1): ICID: 420259
The influence of location, year and cultivar on occurrence, level of infestationand Fusarium species spectrum in winter wheat seeds were evaluated. The wheat seeds from different cultivarsand localities of the Slovak Republic were used for Fusarium species evaluation during years 1999, 2000,2002 and 2003. The significant influence of the locality on total Fusarium kernel infestation was confirmed.The total sample infestation was significantly higher in the colder and moister localities, lower infestationwas in warmer and dryer ones. Cultivar "Astella" was significantly the most susceptible. The widest Fusariumspecies spectrum was recorded in the locations with a high level of total kernel infestation. In localitieswith lower infestation, the species spectrum was less numerous. F. poae was the dominant species in alllocations. The species F. culmorum, F. avenaceum and Microdochium nivale were subdominant and relativelyfrequent in the locations with higher altitude. The frequency and density of other isolated species (F.graminearum, F. sporotrichioides, F. tricinctum, F. semitectum, F. acuminatum, F. heterosporum, F. sambucinum,F. solani, F. compactum and F. oxysporum) was trivial in all localities. The kernel infestation and Fusariumpopulation structure in wheat grains mostly depends on microclimatic condition of the locality. Risingof rainfall rate and altitude led to an increase in the species spectrum. The wide Fusarium species spectrumis connected with the high frequency of coincident species. The species with low and medium frequencyachieved low or trivial density in population structure.