Lee, Sung-Hee
(Bureau of Research & Development, Chungcheongbuk-do Agricultural Research and Extension Services)
,
Shin, Hyunman
(Bureau of Research & Development, Chungcheongbuk-do Agricultural Research and Extension Services)
,
Chang, Who-Bong
(Bureau of Research & Development, Chungcheongbuk-do Agricultural Research and Extension Services)
,
Ryu, Kyoung-Yul
(Department of Agro-food Safety and Crop Protection, National Institute of Agricultural Sciences, Rural Development Administration)
,
Kim, Heung Tae
(Department of Plant Medicine, Chungbuk National University)
,
Cha, Byeongjin
(Department of Plant Medicine, Chungbuk National University)
,
Cha, Jae-Soon
(Department of Plant Medicine, Chungbuk National University)
Recently, the severe dieback of apple trees resulting from soil-borne diseases has occurred in South Korea. The casual agents of dieback were surveyed on 74 apple orchards that had been damaged nationwide in 2016-2019. The number of apple orchards affected alone by Phytophthora rot, violet root rot,...
Recently, the severe dieback of apple trees resulting from soil-borne diseases has occurred in South Korea. The casual agents of dieback were surveyed on 74 apple orchards that had been damaged nationwide in 2016-2019. The number of apple orchards affected alone by Phytophthora rot, violet root rot, and white root rot was 31, 34, and 3, respectively. Also, the total number of mixed infection orchards was 6. Out of 9,112 apple trees affected by dieback, the trees damaged by Phytophthora rot, violet root rot, and white root rot were 3,332, 3,831, and 44, respectively. Moreover, the total number of mixed infection apple trees was 1,905. The provinces mainly affected were Gyeongnam, Gyeongbuk, Chungbuk, and Jeonbuk. The survey on these infected apple orchards will be available to form management strategy for the dieback that had been increased by soil-borne fungal pathogens.
Recently, the severe dieback of apple trees resulting from soil-borne diseases has occurred in South Korea. The casual agents of dieback were surveyed on 74 apple orchards that had been damaged nationwide in 2016-2019. The number of apple orchards affected alone by Phytophthora rot, violet root rot, and white root rot was 31, 34, and 3, respectively. Also, the total number of mixed infection orchards was 6. Out of 9,112 apple trees affected by dieback, the trees damaged by Phytophthora rot, violet root rot, and white root rot were 3,332, 3,831, and 44, respectively. Moreover, the total number of mixed infection apple trees was 1,905. The provinces mainly affected were Gyeongnam, Gyeongbuk, Chungbuk, and Jeonbuk. The survey on these infected apple orchards will be available to form management strategy for the dieback that had been increased by soil-borne fungal pathogens.
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제안 방법
, 2016; Rural Development Administration, National Institute of Agricultural Science and Technology, 1993; Sivanesan and Holliday, 1972). In addition, the survey was made on the number of surveyed trees and initial pathogenesis year (from 2015 to 2019, 2010 to 2015, before 2010) in diseased orchard lot were investigated.
성능/효과
Although our survey could not be directly compared with the report above, it showed that the incidence degree of Phytophthora rot had increased from rare (+) to frequent (++)– ubiquitous (+++), and that of white root rot had decreased to rare (+) from frequent severity (++).
(2016) reported that 3,350 apple trees had been infected by soil-borne diseases at 24 apple orchards in Chungbuk province from 2013 to 2015. Among these infected apple trees, the number of apple trees diseased by Phytophthora rot was 2,015 (60.2%) at 14 orchards, that of by violet root rot was 1,085 (32.4%) at 5 orchards, and that of by white root rot was 250 (7.5%) at 5 orchards. Our data represent additional pathogenesis apple trees in Chungbuk, compared to the previous report (Lee et al.
In conclusion, our survey has been conducted on much more apple trees and orchards than those of the past reports, and it possible to represent the mixed infection in South Korea. Since the dieback symptom resulting from soil-borne fungal pathogens in apple trees are not easily to be controlled by the fungicides, it is essential to establish a comprehensive and effective control method, and clarify the dieback causes based on the understanding of cultivation characteristics and soil environment for the infected apple orchards throughout the country.
The mixed infection caused by all the diseases such as Phytophthora rot, violet root rot, and white root rot occurred at 1 orchard in Chungnam and Gyeongbuk province each (Table 1). This survey indicates that at least 87.9% of the apple orchards that had shown dieback symptom was mainly caused by Phytophthora and Helicobasidium. It also reveals that the mixed infection such as Phytophthora rot, violet root rot, and white root rot has occurred later.
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