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231225s2021 xx |||||o 00| ||eng c |
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|a 10.1094/PDIS-07-20-1424-RE
|2 doi
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|a eng
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1 |
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|a Liu, Cheng-Long
|e verfasserin
|4 aut
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|a Dieback and Leaf Spot in Box Elder (Acer negundo) Caused by Exserohilum rostratum
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|c 2021
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|a Date Completed 30.12.2021
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|a Date Revised 30.12.2021
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Leaf spot and dieback were observed on box elder (Acer negundo) grown in a nursery in Tai'an city, Shandong Province, China, in 2019, with a disease incidence of 86%. The incidences of Exserohilum rostratum isolation were 75% from the shoots and 66.6% from the leaves of field-infected plants. Isolates were identified at the species level on the basis of morphological characteristics and through phylogenetic analysis of concatenated partial sequences of the internal transcribed spacer (ITS) region and cam, gapdh, tef1, rpb2, tub2, and his genes from the Exserohilum isolates. The effects of temperature on the mycelial growth of the Exserohilum rostratum isolates were also characterized. In greenhouse tests, seedlings inoculated with the pathogen exhibited systemic symptoms similar to those observed in the field. In pathogenicity experiments on shoots, wounded seedlings were observed to be blighted, suggesting that leaf spot and dieback may develop into more severe blight or dieback when high winds, sudden temperature decreases, or insect infestations occur. To our knowledge, this is the first report of dieback and leaf spot caused by E. rostratum on a species of A. negundo
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| 650 |
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|a Journal Article
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|a forest pathology
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| 650 |
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4 |
|a fungal pathogens
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| 650 |
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4 |
|a fungi
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| 700 |
1 |
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|a Zheng, Xiang-Rong
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|a Chen, Feng-Mao
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