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TWO SPECIES OF ENTOMOPHTHORA PATHOGENIC TO THE EASTERN HEMLOCK LOOPER (LEPIDOPTERA: GEOMETRIDAE) IN NEWFOUNDLAND1

Published online by Cambridge University Press:  31 May 2012

I. S. Otvos ,
D. M. MacLeod  and
D. Tyrrell
I. S. Otvos
Affiliation:
Newfoundland Forest Research Centre, Canadian Forestry Service, St. John's, Newfoundland
D. M. MacLeod
Affiliation:
Insect Pathology Research Institute, Canadian Forestry Service, Sault Ste. Marie, Ontario
D. Tyrrell
Affiliation:
Insect Pathology Research Institute, Canadian Forestry Service, Sault Ste. Marie, Ontario
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Abstract

Two fungi, Entomophthora sphaerosperma and E. egressa, were collected and identified from larvae of the eastern hemlock looper, Lambdina f. fiscellaria (Guen.), in Newfoundland. These two fungi appear to play the most important role in the decline of looper infestations. Field trials indicate that the disease can be transmitted from laboratory-reared larvae artificially infected with the protoplast stage of E. egressa, to uninfected larvae. This suggests that infection may be established artificially within a population of the looper prior to the ’natural’ occurrence of the epizootic.

Résumé

Deux champignons, Entomophthora sphaerosperma et E. egressa, étaient collectionnés et identifiés à Terre Neuve, comme pathogènes des larves de l’arpenteuse de la pruche, Lambdina f. fiscellaria (Guen.). Il paraît que ces deux champignons jouent le rôle le plus important dans le contrôle des infestations de l’arpenteuse de la pruche. Les expériences en campagne indiquent que la maladie peut être transmise des larves élevées artificiellement au laboratoire, infectées de la phase protoplaste d’E. egressa, aux larves non infectées. Ceci suggère que l’infection peut être établie artificiellement dans une population de l’arpenteuse de la pruche avant que l’épizootie n’apparaisse naturellement.

Type
Articles
Information
The Canadian Entomologist , Volume 105 , Issue 11 , November 1973 , pp. 1435 - 1441
Copyright
Copyright © Entomological Society of Canada 1973

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References

Carroll, W. J. 1956. History of the hemlock looper, Lambdina fiscellaria fiscellaria (Guen.), (Lepidoptera: Geometridae) in Newfoundland, and notes on its biology. Can. Ent. 88: 587–599.CrossRefGoogle Scholar
de Gryse, J. J. and Schedl, K.. 1934. An account of the eastern hemlock looper on hemlock with notes on allied species. Scient. Agric. 14: 523–539.Google Scholar
Fresenius, G. 1858. Ueber die Pilzgattung Entomophthora. Abh. senckenb. naturforsch. Ges. 2: 201–210 (1856–1858).Google Scholar
McMorran, A. 1965. A synthetic diet for the spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae). Can. Ent. 97: 58–62.CrossRefGoogle Scholar
Müller-Kögler, E. 1959. Zur Isolierung und Kultur insektenpathogener Entomophthoraceen. Entomophaga 4: 261–274.CrossRefGoogle Scholar
Otvos, I. S., Clark, R. C., and Clarke, L.. 1971. The hemlock looper in Newfoundland: The outbreak, 1966 to 1971; and aerial spraying, 1968 and 1969. Can. Dep. Envir., Can. For. Serv., Inf. Rept. N-X-68. 62 pp.Google Scholar
Tyrrell, D. and MacLeod, D. M.. 1972. Spontaneous formation of protoplasts by a species of Entomophthora. J. invert. Path. 19: 354–360.CrossRefGoogle Scholar