Current Situation of Fire Blight in China.

Abstract

Fire blight, caused by the plant-pathogenic bacterium Erwinia amylovora, is a devastating disease that occurs on rosaceous plants, including pears and apples. E. amylovora is indigenous to North America and was spread to the Eurasian continent in the second half of the 20th century through contaminated plant materials. In 2016, fire blight was first observed in Yili, Xinjiang Province, in Northwestern China. Since then, it has spread to most pear-producing regions in Xinjiang Province and parts of Gansu Province. The disease has caused severe damage to China's pear and apple industries, including the 2017 disease epidemic in Korla, Xinjiang, which caused an overall yield reduction of 30 to about 50% in Korla and the destruction of over 1 million pear trees. Over the past few years, a combined effort of research, extension, and education by the Chinese government, scientists, and fruit growers has greatly alleviated outbreaks and epidemics in affected regions while successfully limiting the further spread of fire blight to new geographical regions. Here, we review the occurrence, spread, and damage of this disease to the Chinese fruit industry, as well as the management options used in China and their outcomes. We also discuss future perspectives for restraining the spread and alleviating the damage of fire blight in China.