Outbreak of Rice Panicle Blast in Southern Provinces of Korea in 2014

Abstract

Rice panicle blast occurred severely in southern provinces of Korea in 2014. The proportion of panicle blast incidence area to cultivated area of rice were 11.0% and 14.6% in Jeollanam-do and Gyeongsangnam-do, respectively. To identify the causal factors of the outbreak, we investigated weather conditions in August, amount of cultivated area of mainly grown cultivars, and nitrogen contents in plants with different disease incidences in 2014. 'Saenuri,' 'Ilmibyeo,' 'Unkwang,' 'Dongjin 1 ho,' 'Nampyeongbyeo,' and 'Hwangkeumnuri' were mainly grown cultivars. Monthly average of daily air temperature in August 2014 was 3.2°C and 3.1°C less than 2018 in Haenam and Miryang, respectively. Rainfall in August 2014 was 70.0% and 42.0% greater than 2018 in Haenam and Miryang, respectively. The numbers of blast warning days in August calculated nationwide using a forecast model for blast infection were higher in 2014 than in 2018, and they were in high level throughout the country in 2014. Nitrogen contents in plant samples from high-incidence plots were significantly higher than those from low-incidence plots. Consequently, excessive use of nitrogen fertilizers was the main factor for the disease outbreak at the level of specific farms, in addition to the collective cultivation of susceptible cultivar, low temperatures and frequent rainfalls in August.

Study on Major Disease-insect Incidence of Scented Gobindabhog Rice in New Alluvial Zone of West Bengal

“…Rice blast development is intimately related to meteorological factors that include air temperature, accumulated rainfall, and amount of sunshine kang [9][10][11][12]. The blast lesions observed on Gobindabhog rice plants were found to increase from 28 DAT to 84 DAT during both years of investigation (Table 3).…”

Outbreak of Rice Panicle Blast in Jeonbuk Province of Korea in 2021

“…The favorable weather conditions for rice blast are known to be low air temperature and accumulated rainfall ( Kang et al, 2019 ; Katsantonis et al, 2017 ; Kim et al, 2018 ; Lee and Park, 1979 ). Frequent rainfall during the heading season of rice is intimately related to panicle blast occurrence ( Lee et al, 2010 ).…”

Outbreak of Rice Blast Disease at Yeoju of Korea in 2020

“…Rice blast development is intimately related to meteorological factors that include air temperature, accumulated rainfall, and amount of sunshine (Kang et al, 2019;Katsantonis et al, 2017;Kim et al, 2018;Lee and Park, 1979) 2). In 2019, the average air temperature in June was close to the climatological normals but was 0.7 o C higher in July.…”

“…Rice blast development is intimately related to meteorological factors that include air temperature, accumulated rainfall, and amount of sunshine ( Kang et al, 2019 ; Katsantonis et al, 2017 ; Kim et al, 2018 ; Lee and Park, 1979 ). Meteorological factors including the average air temperature, rainfall, rainy days, and the average amount of sunshine at Yeoju from June to July in 2019 and 2020 were compared with mean values of climate parameters (climatological normals) from 1981 to 2010 to investigate the meteorological factors affecting the incidence of rice leaf blast.…”