Downy mildew (Peronospora manshurica) of soybean | Plamenjaca soje (Peronospora manshurica)
2008
Vidic, M., Institut za ratarstvo i povrtarstvo, Novi Sad (Serbia) | Jasnic, S., Poljoprivredni fakultet, Novi Sad (Serbia)
Downy mildew is the most widespread disease of soybean in the world as well as in Serbia. The causal agent is Peronospora manshurica. In years favourable for the development of the parasite, yields of susceptible cultivars may be reduced up to 8%. Disease symptoms may be systemic and local. Most typical symptoms occur on leaves, in the form of chlorotic spots which necrose and coalesce with time. Conidiophores and conidia grow over the reverse side of the leaf. P. manshurica survive by durable spores (oospores) which reside on seeds and plant residues. In the course of growing season, P. manshurica proliferates by conidia. Control measures include the growing of resistant cultivars, use of healthy seed or seed treatment with fungicides based on metalaxyl, oxadyxil, mancozeb, etc., crop rotation and thorough plowing under of plant residues.
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