Defoliation by insects reduces the wood quality and cellulosic pulp production
-
Antonio José Vinha Zanuncio
,
Amélia Guimarães Carvalho
Abstract
Defoliating insects damage forest plantations, but the estimation of their losses does not take into account wood quality changes. The objective was to evaluate the wood quality and pulp production of two clones of Eucalyptus grandis × Eucalyptus urophylla (clone A) and Eucalyptus saligna (clone B) damaged or not by defoliating insects. Five healthy trees and five attacked by Gonipterus platensis Marelli (Coleoptera: Curculionidae) were selected per clone. The wood volume per hectare in the affected settlements was at least 9% lower and damaged trees showed lower wood basic density, with at least 4.6%. The lignin and extractive content in the wood increased by at least 5.6 and 45%, respectively, while the syringyl/guaiacyl (S/G) ratio remained constant for clone A and increased 10% for clone B. For pulps, an increased effective alkali and decreased pulp yield were experienced for both clones while bleaching or pulp quality was not affected. In the stands affected by defoliating insects, productivity was 9 and 19% lower considering the wood volume per hectare and 15 and 24% considering the cellulose pulp production per hectare, respectively.
Acknowledgments
Dr. Phillip John Villani (University of Melbourne, Australia) revised and corrected the English language in this manuscript.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: We are grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Fundação de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) and “Programa Cooperativo sobre Proteção Florestal (PROTEF)” of the “Instituto de Pesquisas e Estudos Florestais (IPEF)” for financial support.
Employment or leadership: None declared.
Honorarium: None declared.
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©2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- An effective technique for constructing wood composite with superior dimensional stability
- Numerical analysis of moisture-induced strains and stresses in glued-laminated timber
- Contribution of lignin to the stress transfer in compression wood viewed by tensile FTIR loading
- Effect of enzymatic hydrolysis lignin on the mechanical strength and hydrophobic properties of molded fiber materials
- Investigating tool engagement in groundwood pulping: finite element modelling and in-situ observations at the microscale
- Defoliation by insects reduces the wood quality and cellulosic pulp production
- Effect of pulp fibers on the surface softness component of hygiene paper
- Cellulose triacetate from different sources: modification assessment through thermal and chemical characterization
- Incorporation of nano lignin reverse micelles on the transparency, UV-blocking and rheological properties of high-density polyethylene films
- Cellulose nanocrystals/silver nanoparticles: in-situ preparation and application in PVA films
- Larch-derived hierarchical nitrogen-doped carbon with echinus-like architecture for supercapacitor applications
Articles in the same Issue
- Frontmatter
- An effective technique for constructing wood composite with superior dimensional stability
- Numerical analysis of moisture-induced strains and stresses in glued-laminated timber
- Contribution of lignin to the stress transfer in compression wood viewed by tensile FTIR loading
- Effect of enzymatic hydrolysis lignin on the mechanical strength and hydrophobic properties of molded fiber materials
- Investigating tool engagement in groundwood pulping: finite element modelling and in-situ observations at the microscale
- Defoliation by insects reduces the wood quality and cellulosic pulp production
- Effect of pulp fibers on the surface softness component of hygiene paper
- Cellulose triacetate from different sources: modification assessment through thermal and chemical characterization
- Incorporation of nano lignin reverse micelles on the transparency, UV-blocking and rheological properties of high-density polyethylene films
- Cellulose nanocrystals/silver nanoparticles: in-situ preparation and application in PVA films
- Larch-derived hierarchical nitrogen-doped carbon with echinus-like architecture for supercapacitor applications
