Determination of the lethal conditions for sclerotia of Sclerotium cepivoirum Berkley using a simulative soil solarization system in a plastic bottle

Hiroyuki Iyozumi, Fuyumi Takahashi, Ayaka Terada
2020 Annual Report of The Kansai Plant Protection Society  
The authors determined the lethal conditions for sclerotia of Allium white rot pathogen (Sclerotium cepivorum Berkeley) during soil solarization. We found that during soil solarization at continual high soil temperature conditions (above 30°C daily average over 6 weeks), the green manure incorporation (GMI), with or without calcium cyanamide, was effective in reducing the living sclerotia in commercial fields, and was enhanced at higher soil moisture. To verify the conditions of this
more » ... of this conventional soil solarization, GMI into soil with calcium cyanamide and temporal flooding of the treated soil space were performed using a simulated soil solarization method in a plastic bottle. The simulation was carried out in growth chambers set at approximately 36°C (14L/10D, 40/30°C), 30°C (12L/12D, 35/25°C), or 25°C (10L/14D, 30/20°C). Around 36°C, no living sclerotia were found after the 2-weeks incubation irrespective of the GMI. Around 30°C, on the other hand, living sclerotia were found after 6 weeks of incubation only in bottles without GMI. Around 25°C, living sclerotia were found even after 6 weeks in both treatments. These results indicate that this simulative method is capable of reproducing the lethal conditions of sclerotia during soil solarization.
doi:10.4165/kapps.62.107 fatcat:a2m7m7s57zdrpkplsltoo6jywa