7
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: not found

      The Regulation of European Spruce Sawfly Numbers in the Maritime Provinces of Canada from 1937 to 1963

      ,

      The Canadian Entomologist

      Cambridge University Press (CUP)

      Read this article at

      ScienceOpenPublisher
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          The European spruce sawfly, Diprion hercyniae(Htg.), was first discovered in Canada in 1930 and in the next few years attained outbreak proportions in spruce forests over large areas in the Gaspé Peninsula and New Brunswick. The accidental introduction of a polyhedrosis in the early 1930’s was responsible for the rapid decline of the infestation, and under the influence of both disease and introduced parasites, densities throughout the range of the sawfly have been fluctuating at very low levels for the past 20 years. Population studies have been conducted on this insect in New Brunswick since 1938 and data are now available for 50 consecutive generations over a 25-year period. Morris’ key-factor approach, using parasites, disease and weather as the key factors, has been used in the analyses of the data. Although disease obscured the effect of other control factors, during high sawfly densities, larval parasites have been largely responsible for maintaining the low densities experienced in New Brunswick for the past 20 years. A pronounced change in the relative importance of the different parasite species and in the amount of cocoon predation attributable to small mammals and wireworms has occurred during the change from high to low host densities.

          Related collections

          Most cited references 5

          • Record: found
          • Abstract: not found
          • Article: not found

          Some Characteristics of Simple Types of Predation and Parasitism

           C S Holling (1959)
            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Differentiation by Small Mammal Predators Between Sound and Empty Cocoons of the European Spruce Sawfly

              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Artificially Disseminated Virus as a Factor Controlling the European Spruce Sawfly, Diprion hercyniae (Htg.) in the Absence of Introduced Parasites

                Bookmark

                Author and article information

                Journal
                applab
                The Canadian Entomologist
                Can Entomol
                Cambridge University Press (CUP)
                0008-347X
                1918-3240
                May 1964
                May 31 2012
                May 1964
                : 96
                : 05
                : 773-784
                Article
                10.4039/Ent96773-5
                © 1964

                Comments

                Comment on this article