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Wood Research and Technology


Cellulose – Hemicelluloses – Lignin – Wood Extractives

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Defoliation by insects reduces the wood quality and cellulosic pulp production

Antonio José Vinha Zanuncio
  • Corresponding author
  • Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Monte Carmelo, MG 38500-000, Brazil
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Amélia Guimarães Carvalho
  • Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Monte Carmelo, MG 38500-000, Brazil
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Mariane Bueno de Camargo / Flaviana Reis Milagres / Vinícius Resende de Castro / Jorge Luiz Colodette / Graziela Baptista Vidaurre
  • Universidade Federal do Espírito Santo, Centro de Ciências Agrárias, Jerônimo Monteiro, Brazil
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ José Cola Zanuncio
Published Online: 2019-11-14 | DOI: https://doi.org/10.1515/hf-2019-0134


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.

Keywords: bleaching; pulping; wood basic density; wood chemistry


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About the article

Received: 2019-05-09

Accepted: 2019-09-06

Published Online: 2019-11-14

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.

Citation Information: Holzforschung, 20190134, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf-2019-0134.

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