1. Effective Control Measures for Sweet Potato Foot Rot Disease in Severely Affected Areas Based on Network Analysis.
- Author
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Takeo Shima, Masaki Ochiai, Yuki Kobayashi, Takanori Ishii, Tooru Kobayashi, Erika Kamada, Kirara Saitou, Hiroyuki Sekiguchi, and Shigenobu Yoshida
- Abstract
Since 2018, disease of sweet potato foot rot (diaporthe destruens) has been rampant in southern Kyushu, causing serious problems due to the decrease in yield caused by the withering of sweet potato plants and the rotting of tubers. As its appearance in Japan is recent, preventive countermeasures used overseas such as the selection of resistant cultivars and pesticide spraying have been used and have shown some effectiveness. However, in areas where the damage is severe, it has proved difficult to suppress with these countermeasure alone. We conducted a field survey in areas of southern Kyushu where the disease has caused severe damage to investigate its incidence in 36 fields and the use of countermeasures by farmers, and used the collected data and network analysis to examine the effectiveness of combinations of countermeasures. We found that damage was suppressed in fields where all three countermeasures were implemented. Firstly, resistant varieties were introduced, secondary residual treatment of decayed potatoes after harvest and crop rotation were implemented to reduce soil residual risk, and thirdly drainage measures were implemented to reduce flooding due to rainfall. In regions where sweet potato foot rot disease is severe, measures combining these countermeasures should be prioritized. [ABSTRACT FROM AUTHOR]
- Published
- 2024