Lasiodiplodia theobromae and Neoscytalidium dimidiatum associated with grafted walnut (Juglans regia L.) decline in Turkey
Date
2023
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SpringerLink
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Abstract
Surveys of canker diseases in 26 walnut orchards were conducted in the southeastern Turkish provinces of Batman, Diyarbakır,
and Şanlıurfa in 2020. Decline symptoms on trees were most severe in the trunks of grafted trees grown on unproductive
local rootstocks with Chandler and Franquette scions throughout the surveyed areas, and samples were taken from those
trees. Lasiodiplodia theobromae was identifed from the cankers on the trees of the seven orchards, while Neoscytalidium
dimidiatum was identifed from the other 19 orchards based on morphological characteristics. DNA sequencing analysis of
10 representative isolates using the ITS1-5.8S-ITS2 (ITS), the large subunit (LSU), and the translation elongation factor
1-alpha (EF-1α) genes confrmed the identifcation of the causal fungi. Pathogenicity tests on 2 year-old Chandler seedlings
revealed that L. theobromae and N. dimidiatum produced lesion length averages of 7–8 cm and 15–25 cm after 3 weeks
of stem-inoculation, respectively. Koch’s postulates were confrmed by successfully reisolating the fungi only from plants
inoculated. This is the frst study to document L. theobromae as the causal agent of walnut tree decline and cankers in Turkey.
Description
Keywords
Canker, Botryosphaeriaceae, Trunk pathogens
Turkish CoHE Thesis Center URL
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Source
Journal of Plant Diseases and Protection
Volume
Issue
Start Page
1
End Page
12