|
Registro Completo |
|
Biblioteca(s): |
Embrapa Florestas. |
|
Data corrente: |
20/08/1991 |
|
Data da última atualização: |
28/02/2025 |
|
Autoria: |
ALFARO, R. I. |
|
Título: |
Mortality and top-kill in douglas-fir following defoliation by the western spruce budworm in British Columbia. |
|
Ano de publicação: |
1986 |
|
Fonte/Imprenta: |
Journal of Entomological Society of British Columbia, v. 83, p. 19-26, 1986. |
|
Idioma: |
Inglês |
|
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. |
|
Thesagro: |
Lagarta; Praga. |
|
Thesaurus Nal: |
Choristoneura occidentalis; Pseudotsuga menziesii. |
|
Categoria do assunto: |
O Insetos e Entomologia |
|
Marc: |
LEADER 01430naa a2200169 a 4500
001 1279741
005 2025-02-28
008 1986 bl uuuu u00u1 u #d
100 1 $aALFARO, R. I.
245 $aMortality and top-kill in douglas-fir following defoliation by the western spruce budworm in British Columbia.$h[electronic resource]
260 $c1986
520 $aSurveys 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.
650 $aChoristoneura occidentalis
650 $aPseudotsuga menziesii
650 $aLagarta
650 $aPraga
773 $tJournal of Entomological Society of British Columbia$gv. 83, p. 19-26, 1986.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Florestas (CNPF) |
|
