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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
20/08/1991 |
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Data da última atualização: |
28/02/2025 |
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Autoria: |
ALFARO, R. I. |
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Título: |
Mortality and top-kill in douglas-fir following defoliation by the western spruce budworm in British Columbia. |
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Ano de publicação: |
1986 |
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Fonte/Imprenta: |
Journal of Entomological Society of British Columbia, v. 83, p. 19-26, 1986. |
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Idioma: |
Inglês |
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Conteúdo: |
Surveys of mortal ity and top-kill caused by th e western spruce budworm, Choristoneura occidentaliss Freeman, in 65 stands of Douglas-fir. Pseudotsuga menziesii (Mirb.) Franco arc reported. Top-kill was detected in 85% of the s ta nds and 25o/c of the trees surveyed. Mortality amounted to 8% and less than 1% of the trees examined in the Vancouver and Kamloops Forest Regions. respectively. Both frequency of top-kill and mortality were related to the number of years defoliation in the stand and were higher on suppressed trees than on dominant or codominant trees. Younger stands sustained a higher incidence of top-kill than older stands. Tree mortality was higher on steep s lopes than on ilatterrain. These results suggested that lop-kill or mortality were the re.sults of physiological stress on the tree,. in addition to the dehilitaling elTects of defolialion. |
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Thesagro: |
Lagarta; Praga. |
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Thesaurus Nal: |
Choristoneura occidentalis; Pseudotsuga menziesii. |
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Categoria do assunto: |
O Insetos e Entomologia |
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Marc: |
null
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Embrapa Florestas (CNPF) |
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