Erwinia amylovora species were isolated from the blossoms, exudates, infected fruits, leaves and bent branches of diseased apple, pear and hawthorn trees, selected in the Chy, Osh and Jalal Abad regions. Biochemical a...Erwinia amylovora species were isolated from the blossoms, exudates, infected fruits, leaves and bent branches of diseased apple, pear and hawthorn trees, selected in the Chy, Osh and Jalal Abad regions. Biochemical and pathogenicity tests, alongside PCR analyses, were conducted to identify the local isolates of Erwinia amylovora. The alternative antagonistic microorganisms which combat bacterium E. amylovora were tested within in vitro and in vivo conditions. The results revealed the ability of Streptomyces antagonistic bacteria to decrease fire blight severity on pear and apple trees during the first stage of the fire blight disease in leaf tissues. Streptomyces strain C1-4 suppressed E. amylovora disease symptoms in the leaf tissues and excised apple and pear shoots. The incidence of fire blight on leaves was reduced by about 70% with two applications of bacterial antagonists. Further studies at different locations in Kyrgyzstan, using large scale application, would allow for stronger recommendations to be made, including studies and recommendations on their ability to prevent disease and to use them as main components in an integrated pest management program.展开更多
Fire blight, caused by Erwinia amylovora, is a devastating disease of apples and pears, causing enormous economic losses around the world. The disease is indigenous to North America and has spread to more than 50 coun...Fire blight, caused by Erwinia amylovora, is a devastating disease of apples and pears, causing enormous economic losses around the world. The disease is indigenous to North America and has spread to more than 50 countries since its discovery in 1870 s. Recent reports of the disease in China's neighboring countries, including South Korea, Kyrgyzstan, and Kazakhstan, pose great threat to the world's leading producer of apples and pears. This mini-review intends to provide an update on the disease, pathogen biology, epidemiology, and control. It will also provide some perspectives and suggestions for the apple and pear industry and growers in China, which will face the imminent threat of this devastating disease.展开更多
[目的]探索4种杀菌剂对梨火疫病的田间防治效果与安全性。[方法]采用茎叶喷雾法在新疆库尔勒市香梨园进行了田间药效试验。[结果]4种杀菌剂的各处理对香梨花、果实安全。其中2%春雷霉素水剂100 g a.i./hm2处理和3%噻霉酮水分散粒剂112 g...[目的]探索4种杀菌剂对梨火疫病的田间防治效果与安全性。[方法]采用茎叶喷雾法在新疆库尔勒市香梨园进行了田间药效试验。[结果]4种杀菌剂的各处理对香梨花、果实安全。其中2%春雷霉素水剂100 g a.i./hm2处理和3%噻霉酮水分散粒剂112 g a.i./hm2处理对梨火疫病的防治效果分别为81.56%和78.63%。[结论]抗生素类杀菌剂2%春雷霉素水剂和有机杂环类杀菌剂3%噻霉酮水分散粒剂对梨火疫病田间防治效果较好,可作为今后田间防治梨火疫病选择化学药剂的依据。展开更多
文摘Erwinia amylovora species were isolated from the blossoms, exudates, infected fruits, leaves and bent branches of diseased apple, pear and hawthorn trees, selected in the Chy, Osh and Jalal Abad regions. Biochemical and pathogenicity tests, alongside PCR analyses, were conducted to identify the local isolates of Erwinia amylovora. The alternative antagonistic microorganisms which combat bacterium E. amylovora were tested within in vitro and in vivo conditions. The results revealed the ability of Streptomyces antagonistic bacteria to decrease fire blight severity on pear and apple trees during the first stage of the fire blight disease in leaf tissues. Streptomyces strain C1-4 suppressed E. amylovora disease symptoms in the leaf tissues and excised apple and pear shoots. The incidence of fire blight on leaves was reduced by about 70% with two applications of bacterial antagonists. Further studies at different locations in Kyrgyzstan, using large scale application, would allow for stronger recommendations to be made, including studies and recommendations on their ability to prevent disease and to use them as main components in an integrated pest management program.
基金supported by the National Key R&D Program of China(2016YFC1201200)the National Natural Science Foundation of China(31500107 and 31772231)
文摘Fire blight, caused by Erwinia amylovora, is a devastating disease of apples and pears, causing enormous economic losses around the world. The disease is indigenous to North America and has spread to more than 50 countries since its discovery in 1870 s. Recent reports of the disease in China's neighboring countries, including South Korea, Kyrgyzstan, and Kazakhstan, pose great threat to the world's leading producer of apples and pears. This mini-review intends to provide an update on the disease, pathogen biology, epidemiology, and control. It will also provide some perspectives and suggestions for the apple and pear industry and growers in China, which will face the imminent threat of this devastating disease.
文摘[目的]探索4种杀菌剂对梨火疫病的田间防治效果与安全性。[方法]采用茎叶喷雾法在新疆库尔勒市香梨园进行了田间药效试验。[结果]4种杀菌剂的各处理对香梨花、果实安全。其中2%春雷霉素水剂100 g a.i./hm2处理和3%噻霉酮水分散粒剂112 g a.i./hm2处理对梨火疫病的防治效果分别为81.56%和78.63%。[结论]抗生素类杀菌剂2%春雷霉素水剂和有机杂环类杀菌剂3%噻霉酮水分散粒剂对梨火疫病田间防治效果较好,可作为今后田间防治梨火疫病选择化学药剂的依据。
