Lauka pupu slimības un to ierobežošanas efektivitāte | Diseases of faba bean and their control possibilities
2016
Bankina, B., Latvia Univ. of Agriculture, Jelgava (Latvia) | Bimsteine, G., Latvia Univ. of Agriculture, Jelgava (Latvia) | Katamadze, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Kreita, Dz., Latvia Univ. of Agriculture, Jelgava (Latvia)
Diseases of faba bean are an important risk factor for bean cultivation; different diseases have been observed during last years, but causal agents, harmfulness of diseases and possibilities of control are still unclear. The aim of this research is to investigate development of diseases depending on varieties, seed rate and fungicide application. Three factor field trials were carried out at the Study and Research Farm „Peterlauki” of the Latvia University of Agriculture in 2015: 1) cultivars – Laura’, ‘Isabell’ and ‘Boxer; 2) seed rate – 30; 40 un 50 seeds mE-2; 3) fungicide application – boscalid 267.0 g kgE-1 and piraclostrobin 67.0 g kgE-1 at the beginning of flowering and no application of fungicide. Incidence and severity (0-9 point scale) were assessed every week after emerging of the first symptoms, and values of AUDPC were calculated. Leaf spots, caused by Alternaria spp., and chocolate spot, caused by Botrytis spp., were dominating diseases, but also rust was observed. Development of rust and chocolate spot was influenced by varieties, but Alternaria spot – by seed rate. Fungicide treatment essentially decreased development of diseases, but efficacy was low: 40–42% in relation to Alternaria spot, and only 12–25% in relation to chocolate spot. All three pathogens from genus Botrytis – B. fabae, B. fabiopsis and B. cinerea were identified, but importance of each pathogen should be investigated.
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