Screening Norway spruce (Picca abies (L.) Karst.) for resistance to white pine weevil (Pissodes strobi (Peck)) | [Tri du Picea abies (L.) Karst pour la resistance a Pissodes strobi (Peck)]
1999
Lavallee, R. (Canadian Forest Service Laurentian Forestry Centre, Sainte Foy (Canada). Natural Resources Canada) | Daoust, G. (Canadian Forest Service, Sainte Foy (Canada). Natural Resources Canada, Laurentian Forestry Centre) | Rioux, D.
This study reflects the initial steps in the development of Norway spruce trees resistant to white pine weevil and suitable for Quebec conditions. Weevils were caged on the terminal leaders of 67 clones over two years. Adults of the new generation were counted and weighed alive and the number of oviposition and feeding punctures, the length of the leaders and the length of damage under the bark were measured. Also, another group of 8 clones was used to test the influence of insect feeding on the formation of traumatic resin canals. Results demonstrated that the number of feeding and oviposition punctures was not affected by clones. The adult mean weight, the number of nymphal chambers, and the damage length were significantly affected by clone and per year. The use of a relative performance index to reduce the clone year interaction is discussed. Also, observations under the microscope demonstrated that insect punctures induced the formation of traumatic resin canals into the xylem as well as into the live bark
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