Influence of water temperature, soaking period, and chemical dosage on Bakanae disease of rice (Gibberella fujikuroi) in seed disinfection

벼 종자소독시 수온 처리시간 및 약량이 벼 키다리병 발병에 미치는 영향

  • Park, Heung-Gyu (Chonnam Agricultural Research and Extension Service) ;
  • Shin, Hae-Ryong (Chonnam Agricultural Research and Extension Service) ;
  • Lee, Yeen (Chonnam Agricultural Research and Extension Service) ;
  • Kim, Suk-Wean (Chonnam Agricultural Research and Extension Service) ;
  • Kwon, Oh-Do (Chonnam Agricultural Research and Extension Service) ;
  • Park, In-Jin (Chonnam Agricultural Research and Extension Service) ;
  • Kuk, Yong-In (Biotechnology Research Institute, Chonnam National Univ.)
  • Published : 2003.09.30

Abstract

In order to develop effective control methods for Bakanae disease caused by Gibberella fujikuroi (Saito) Ito during rearing of rice seedlings, we investigated the disease resistance of 15 rice varieties to G. fujikuroi and control effect of six seed disinfectants, and tried to improve the using methods of the seed disinfectants. Disease resistance was tested by investigating the disease incidence on each rice cultivar grown in rice seedling box infested with or not infested with G. fujikuroi at 30 days after sowing seeds and 20 days after heading date. The results showed that Hwayongbyeo, Dongjinbyeo, Hwoanbyeo, Nonghobyeo, Nampyeongbyeo, and Hwojinbyeo were resistant G. fujikuroi, meanwhile Keulubyeo, Sobibyeo, Odaebyeo, Junambyeo, Samchonebyeo, Sangjubyeo, and Hwabongbyeo were susceptible. Three seed disinfectants, prochloraz, fludioxonil, and carproamid + thiram + fludioxonil controlled Bakanae disease of rice very well, while bonomyl + thiram, thiophanate-methyl + thiram and thiophanate-methyl + triflumizole did not suppress the disease enough. Water temperature was turned to be an important factor for controlling the disease by treating seed disinfectants. Prochloraz showed 61% control value on the disease at $10^{\circ}C$, but it showed above 95% control value at the range of $30-35^{\circ}C$. It was confirmed that the control effect of seed disinfectants increased with increasing water temperature. Meanwhile soaking period of rice seeds in the suspension of seed disinfectants and chemical dosage had no high relation to control the disease. This results suggest that rice varieties, water temperature, and optimal selection of suitable seed disinfectants are very important to control Bakanae disease effectively.

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