Investigations on yellowing of chestnut crowns in Trentino (Alps, Northern Italy)
Daniela Bertoldi (1), Paolo Miorelli (1), Federico Pedrazzoli (1), Stefano Delugan (2), Marco Deromedi (3), Giorgio Maresi (1)
iForest - Biogeosciences and Forestry, Volume 13, Issue 5, Pages 466-472 (2020)
doi: https://doi.org/10.3832/ifor3488-013
Published: Oct 07, 2020 - Copyright © 2020 SISEF
Research Articles
Abstract
Yellowing of part or the whole canopy of chestnut trees was observed during the summer of 2014 in the areas of Tenno, Pranzo and Drena in Trentino, where chestnut cultivation is traditional on the lateral moraine deposit in a context of a prevalent limestone lithological substrate. Symptoms were observed on chestnut trees of different ages, either grafted or not, scattered or in stripes along the maximum slope. Investigations were carried out in the form of field surveys, chemical and molecular analyses of soil and leaves and greenhouse trials, to assess the damage evolution and its causes. No known pathogens emerged during the field surveys, and laboratory tests excluded the presence of phytoplasma infections. A comparison of yellow and asymptomatic leaves evidenced significant deficiencies of manganese (Mn) and iron (Fe) in the yellow leaves, though the level of the two nutrients was the same in the soil below green and yellowed trees. Experimental run-off trials in the greenhouse reproduced the foliage damage with a continuous basic water regime; open-field fertilizations with Mn and Fe led to a slightly recovery on the part of some treated leaves, thus confirming the hypothesis of a probable, sudden deficiency of the mentioned microelements. A possible explanation of this phenomenon could be, on one side, the high precipitation level of 2014, and, on the other side, the previous outbreaks of the Asian chestnut gall wasp, that had reduced foliage volume and thus the organic substance in the soil. The natural recovery from symptoms was clearly visible in trees after four years in a context of normal rainfall regime and increasing organic acid in the soil, after effective biological control of wasp. Even if related to a particular and rare geological condition, this is the first description of Mn deficiency in Castanea sativa.
Keywords
Chestnut Yellowing, Castanea sativa, Phytoplasmas, Foliar Deficiencies, Manganese
Authors’ Info
Authors’ address
Paolo Miorelli
Federico Pedrazzoli 0000-0002-3841-4650
Giorgio Maresi 0000-0001-6806-6135
Fondazione Edmund Mach, Centre for Technology Transfer, v. E. Mach 1, 38010 San Michele all’Adige, TN (Italy)
Free worker, Trento (Italy)
Fondazione Edmund Mach, Research and Innovation Centre, Department of Sustainable Agroecosystems and Bioresources, San Michele all’Adige, TN (Italy)
Corresponding author
Paper Info
Citation
Bertoldi D, Miorelli P, Pedrazzoli F, Delugan S, Deromedi M, Maresi G (2020). Investigations on yellowing of chestnut crowns in Trentino (Alps, Northern Italy). iForest 13: 466-472. - doi: 10.3832/ifor3488-013
Academic Editor
Alberto Santini
Paper history
Received: Apr 29, 2020
Accepted: Aug 04, 2020
First online: Oct 07, 2020
Publication Date: Oct 31, 2020
Publication Time: 2.13 months
Copyright Information
© SISEF - The Italian Society of Silviculture and Forest Ecology 2020
Open Access
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