engleski

Occurrence and intensity of downy mildew on soybean seed in relation to planting date

The main objective of this research was to determinate the impact of downy mildew on soybean seed regarding to planting dates, as well as evaluated differences in occurrence and intensity of disease on seed among tested genotype (cultivar) and years, respectively. Infection of downy mildew in this trial was natural under field conditions. Four-year investigation (1998-2001) was undertaken on 10 domestic soybean cultivars with different level of resistance on downy mildew. The investigation was set up in two planting date (optimal and delayed) on experimental fields of the Agricultural Institute Osijek, Croatia. The obtained results indicate on significant differences in the occurrence and intensity of downy mildew on soybean seed among tested planting dates, cultivars and years. Variability of expression grain yield and percentage of diseased seed were caused by genotypic variability (cultivar) and environmental variability (year and planting date).

soybean seed; cultivar; planting date; downy mildew; climatic conditions

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