PLANT&FOREST

Occurrence of black shoot blight in apple and pear trees in Korea

Mi-Hyun Lee1, Yong Hwan Lee1, Seong Chan Lee2, Hyo-Won Choi3, Mi-Suk Yang3, Jae Sun Moon4, SukYoon Kwon4, Jun Myoung Yu5,*

1Crop Protection Division, National Institute of Agricultural Sciences, Wanju 55365, Korea
2Horticultural and Herbal Environment Division, National Institute of Horticultural and Herbal Science, Wanju 55365, Korea
3Disaster Management Division, Rural Development Administration, Jeonju 54875, Korea
4Plant System Engineering Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Korea
5Department of Applied Biology, Chungnam National University, Daejeon 34134, Korea

*Corresponding author: junyu@cnu.ac.kr

Abstract

Erwinia pyrifoliae, which causes black shoot blight in apple and pear trees, was first identified in Korea in 1995. Extensive measures are typically used to control the disease by eradicating trees in diagnosed orchards, owing to the detrimental impact of the disease on apple and pear production. However, despite governmental efforts, the disease has continuously spread. In this study, we analyzed the current status of the black shoot blight occurrence in apple and pear orchards between 1995 to 2022. Our findings reveal that over the past 28 years, black shoot blight has occurred in 26 cities and districts across five Korean provinces. The affected regions are predominantly concentrated in the northern part of Korea, including the Gangwon and Gyeonggi provinces. Furthermore, black shoot blight has gradually expanded to the northern provincial regions of Chungbuk, Chungnam, and Gyeongbuk, which are centrally situated in Korea. Furthermore, the occurrence pattern of black shoot blight differed between apple and pear orchards; in apple orchards, black shoot blight occurred consistently each year, with a sudden increase in cases in 2020; however, in pear orchards, it has considerably decreased since 2007. To the best of our knowledge, this is the first comprehensive report on the occurrence of black shoot blight in apple and pear trees in 28 years, and the results will provide valuable insights for future disease management strategies.

Keywords

apple, black shoot blight, Erwinia pyrifoliae, pear

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