Forest entomology . den Forstinsektenkunde, seite 359. 4 Fifth Report of the United States Entomological Commission. ForestInsects, by Packard. 1890. 5 Canadian Entomologist, Nov. 1884. HYMENOPTERA—SAW-FLIES, ETC. li plantations and report (see Journal of the Board of Agriculture,October 1906). I had in the same year found this species sparsely dis-tributed in Northumberland. As this hitherto rare species has suddenlyappeared as a destructive insect, it affords a good case in point of thenecessity for the student being well grounded in general entomology. The damage done by this species consis
Forest entomology . den Forstinsektenkunde, seite 359. 4 Fifth Report of the United States Entomological Commission. ForestInsects, by Packard. 1890. 5 Canadian Entomologist, Nov. 1884. HYMENOPTERA—SAW-FLIES, ETC. li plantations and report (see Journal of the Board of Agriculture,October 1906). I had in the same year found this species sparsely dis-tributed in Northumberland. As this hitherto rare species has suddenlyappeared as a destructive insect, it affords a good case in point of thenecessity for the student being well grounded in general entomology. The damage done by this species consists in defoliating larch-treesof various ages (see fig. 17C) ; and as the injury is done whilst the treesare vigorous, it is obvious that the increment is not only appreciablyaffected, but the health of the tree may be considerably impaired. Asthe larch is very susceptible to disease, it is important that everythingbe done to obviate injuries of all sorts. Dr MacDougall thus describes the insect: Adult.—The adult.
Size: 1220px × 2048px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisheredinburghwblackwoo
