Efficacy of chemical control of germinating wheat plant [seeds] diseases
2005
Hudec, K.(Slovenska polnohospodarska univ. v Nitre (Slovak Republic) | Bokor, P. | Huszar, J.
In the presented work, the efficacy of selective fungicide against Fusarium graminearum was evaluated in in vitro conditions. The fungicide seed treatment efficacy was tested by winter wheat kernel germination in 100% pathogenic microenvironment of selected Fusarium graminearum (strain 399). The fungus was cultivated on potato-dextrose agar at 21 deg C and 12/12 hour photoperiods. After the whole culture surface colonisation by the species, the fungicide treated and untreated wheat kernels were placed on the surface of pathogenic medium of each strain. The wheat kernels were germinated by the same cultivation condition as culture incubation. For seed treatment, the following fungicides were used: quazatine, tebuconazole+thiram, carboxin+thiram, difenoconazole, iprodione+triticonazole. On the tenth day after seed placing on agar medium the germination of grains, infestation of roots, sprouts infection and weight of created biomasse were measured. The weight of created biomass is considered as the best general indicator of fungicide efficacy against all form of Fusarium diseases on germinating kernels. According to this indicator, the general efficacy of fungicides was measured in the following downward order against F. graminearum: quazatine, carboxin+thiram, tebuconazole+thiram, difenoconazole, iprodione+triticonazole. The fungicide efficacy against each pathogen is necessary to evaluate separately and the choice of the most effective fungicide requires appreciating according to the prevalent pathogens in the seeds.
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