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POPULATION DENSITY AND DYNAMICS OF LARCH CASEBEARER (LEPIDOPTERA: COLEOPHORIDAE) IN THE BLUE MOUNTAINS OF OREGON AND WASHINGTON BEFORE THE BUILD-UP OF EXOTIC PARASITES

Published online by Cambridge University Press:  31 May 2012

R. B. Ryan
R. B. Ryan
Affiliation:
Forestry Sciences Laboratory, Pacific Northwest Forest and Range Experiment Station, U.S. Department of Agriculture, Forest Service, Corvallis, Oregon 97331
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Abstract

Population density and parasitism of larch casebearer, Coleophora laricella (Hübner), were monitored for 10 years before parasites introduced for biological control became abundant. Overwintering densities remained fairly stable at about 100 larvae per 100 buds. The factor most closely correlated with population change was something, as yet unknown, other than the native parasites, which tended to be inversely density-dependent. The data will serve as the “before” period in a before and after evaluation of the biological control program.

Résumé

La densité de population et le parasitisme du porte-case du mélèze, Coleophora laricella (Hübner), ont été recensés pendant 10 ans avant que des parasites introduits comme auxiliaires de lutte biologique ne soient devenus abondants. Les densités d'hivernement sont restées assez stables à environ 100 larves par 100 bourgeons. Le facteur le plus étroitement correlé avec les variations d'abondance est encore inconnu. Ce facteur est différent des parasites indigènes, qui sont inversement dépendant de la densité. Ces données serviront à couvrir la période “avant” d'une étude d'évaluation avant et après de ce programme de lutte biologique.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 9 , September 1983 , pp. 1095 - 1102
Copyright
Copyright © Entomological Society of Canada 1983

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References

Bousfield, W., Tunnock, S., Pettinger, L., and Ross, D.. 1974. Establishment and distribution of the larch case-bearer parasite Agathis pumila in Idaho, Montana, Washington, Oregon, and British Columbia. U.S. Dep. Agric., For. Serv., Rep. 74–3. 40 pp. Div. State and Private For., Missoula, Mont.Google Scholar
Coppel, H. C. and Mertins, J. W.. 1977. Biological Insect Pest Suppression. Springer-Verlag, Berlin, Heidelberg. 314 pp.CrossRefGoogle Scholar
DeBach, H. and Huffaker, C. B.. 1971. Experimental techniques for evaluation of the effectiveness of natural enemies. pp. 113–140in Huffaker, C. B. (Ed.), Biological Control. Plenum Press, New York.Google Scholar
Denton, R. E. 1958. The larch casebearer in Idaho—a new defoliator record for western forests. U.S. Dep. Agric., For. Serv., Res. Note INT-51. 6 pp. Ogden, Utah.Google Scholar
Denton, R. E. 1972. Establishment of Agathis pumila (Ratz.) for control of larch casebearer, and notes on native parasitism and predation in Idaho. U.S. Dep. Agric., For. Serv., Res. Note INT-164. 6 pp. Intermtn. For. & Range Exp. Stn., Ogden, Utah.Google Scholar
Denton, R. E. 1979. Larch casebearer in western larch forests. U.S. Dep. Agric., For. Serv., Gen. Tech. Rep. INT-55. 62 pp. Ogden, Utah.Google Scholar
Flanders, S. E. 1953. Predatism by the adult hymenopterous parasite and its role in biological control. J. econ. Ent. 46: 541–544.CrossRefGoogle Scholar
Graham, A. R. 1949. Developments in the control of the larch casebearer, Coleophora laricella (Hbn.). 79th A. Rep. ent. Soc. Ont. (1948), pp. 45–50.Google Scholar
Luck, R. F. 1971. An appraisal of two methods of analyzing insect life tables. Can. Ent. 103: 1261–1271.CrossRefGoogle Scholar
Podoler, H. and Rogers, D.. 1975. A new method for the identification of key factors from life-table data. J. Anim. Ecol. 44: 85–114.CrossRefGoogle Scholar
Quednau, F. W. 1967. Notes on mating, oviposition, adult longevity, and incubation period of eggs of the larch casebearer, Coleophora laricella (Lepidoptera: Coleophoridae), in the laboratory. Can. Ent. 99: 397–401.CrossRefGoogle Scholar
Quednau, F. W. 1970. Competition and co-operation between Chrysocharis laricinellae and Agathis pumila on larch casebearer in Quebec. Can. Ent. 102: 602–612.CrossRefGoogle Scholar
Ryan, R. B. 1980. Rearing methods and biological notes for seven species of European and Japanese parasites of the larch casebearer (Lepidoptera: Coleophoridae). Can. Ent. 112: 1239–1248.CrossRefGoogle Scholar
Ryan, R. B. 1981. Recent (1977–1980) releases of imported larch casebearer parasites for biological control. U.S. Dep. Agric., For. Serv., Res. Note PNW-377. 6 pp.Google Scholar
Ryan, R. B., Bousfield, W. E., Denton, R. E., Johnsey, R. L., Pettinger, L. F., and Schmitz, R. F.. 1975. Additional releases of larch casebearer parasites for biological control in the western United States. U.S. Dep. Agric., For. Serv., Res. Note PNW-242. 7 pp. Pacif. Northwest For. & Range Exp. Stn., Portland, Oreg.Google Scholar
Ryan, R. B., Bousfield, W. E., Johanningmeier, C. W., Parsons, G. B., Schmitz, R. F., and Theroux, L. J.. 1977. Releases of recently imported larch casebearer parasites for biological control in the western United States, including relocations of Agathis pumila. U.S. Dep. Agric., For. Serv., Res. Note PNW-290. 8 pp. Pacif. Northwest For. & Range Exp. Stn., Portland, Oreg.Google Scholar
Ryan, R. B. and Denton, R. E.. 1973. Initial releases of Chrysocharis laricinellae and Dicladocerus westwoodii for biological control of larch casebearer in the western United States. U.S. Dep. Agric., For. Serv., Res. Note PNW-200. 4 pp. Pacif. Northwest For. & Range Exp. Stn., Portland, Oreg.Google Scholar
Ryan, R. B. and Theroux, L. J.. 1981. Establishment and distribution in 1977 of Chrysocharis laricinellae (Hymenoptera: Eulophidae), a parasite of the larch casebearer, Coleophora laricella (Lepidoptera: Coleophoridae), in western forests. Can. Ent. 113: 1129–1130.CrossRefGoogle Scholar
Sloan, N. F. 1965. Biotic factors affecting populations of the larch casebearer, Coleophora laricella Hbn. in Wisconsin. Ph.D. Thesis, U. Wis. 193 pp.Google Scholar
Smith, H. S. 1916. An attempt to redefine host relationships exhibited by entomophagous insects. J. econ. Ent. 9: 477–486.CrossRefGoogle Scholar
Southwood, T. R. E. 1966. Ecological Methods. Methuen, London. 391 pp.Google Scholar
Turnbull, A. L. and Chant, D. A.. 1961. The practice and theory of biological control in Canada. Can. J. Zool. 39: 697–753.Google Scholar
Varley, G. C. and Gradwell, G. R.. 1968. Population models for the winter moth. pp. 132–142in Southwood, T. R. E. (Ed.), Insect Abundance. Symp. R. ent. Soc. Lond., Vol. 4.Google Scholar
Varley, G. C., Gradwell, G. R., and Hassell, M. P.. 1974. Insect population ecology. Univ. Calif. Press, Berkeley, Los Angeles. 212 pp.Google Scholar
Webb, F. E. 1953. An ecological study of the larch casebearer, Coleophora laricella Hbn. (Lepidoptera: Coleophoridae). Ph.D. Thesis, U. Mich. 210 pp.Google Scholar
Webb, F. E. and Denton, R. E.. 1967. Larch casebearer. pp. 85–88 in Important Forest Insects and Diseases of Mutual Concern to Canada, the United States and Mexico. Dep. For. Rural Devel. Can. Publ. 1180. Ottawa.Google Scholar
Webb, F. E. and Quednau, F. W.. 1971. Coleophora laricella (Hübner), larch casebearer (Lepidoptera: Coleophoridae). pp. 131–136in Biological Control Programmes Against Insects and Weeds in Canada 1959–1968. Commonw. Inst. Biol. Cont. Tech. Comm. Commonw. Agric. Bur., Slough.Google Scholar