Differential effect of delayed planting on soybean cultivars varying in susceptibility to bacterial pustule and wildfire in Korea |
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| Institution: | 1. Department of Horticultural Science, Gyeongnam National University of Science and Technology, Jinju 660-758, South Korea;2. Jeonnam Agricultural Research and Extension Service, Naju 520-715, South Korea;3. National Institute of Crop Science, Rural Development Administration, Suwon 441-857, South Korea;4. Department of Bio-Applied Sciences, Konkuk University, Seoul 143-187, South Korea;5. Laboratory of Plant Disease and Biocontrol, Division of Biotechnology, Korea University, Seoul 136-713, South Korea;1. Materials Group, Bhabha Atomic Research Centre, Mumbai, India;2. Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai, India;1. Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, Maharashtra, India;2. Reactor Engineering Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra, India;1. Uranium Extraction Division, Bhabha Atomic Research Centre, Mumbai 400085, India;2. Materials Group, Bhabha Atomic Research Centre, Mumbai 400085, India;3. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India |
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| Abstract: | In 2009 and 2010, the effect of delayed planting on bacterial pustule (Xanthomonas axonopodis pv. glycines) and wildfire (Pseudomonas syringae pv. tabaci) in four soybean cultivars was evaluated in fields in Suwon and Naju, Korea. Soybean was planted on 15 May as the first (traditional) planting date; then, planting was delayed at approximately 15-day intervals (three times) after the first planting. In plots planted approximately 15 or 30 days after the traditional planting date, the disease incidence in highly (Saeolkong and Taegwangkong) and moderately (Pungsannamulkong) susceptible cultivars was significantly reduced under moderate disease pressure, but disease reduction in highly susceptible cultivars was sometimes diminished especially against bacterial pustule under high disease pressure. Altered planting date had no effect on disease incidence in the least susceptible (resistant) cultivar (Cheongja-3-ho), regardless of disease pressure. Consistent differences in disease occurrence were not observed between planting locations. The results from this study indicate that delayed soybean planting reduced the bacterial disease incidence and differentially affected resistant and susceptible cultivars. Thus, planting resistant cultivars at the optimal planting date is desirable, but in the case of susceptible cultivars, delayed planting could be considered along with application of other control measures such as agrochemicals. |
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