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INCIDENCE OF LEIDYANA CANADENSIS (APICOMPLEXA: EUGREGARINIDA) IN LAMBDINA FISCELLARIA FISCELLARIA LARVAE (LEPIDOPTERA: GEOMETRIDAE)

Published online by Cambridge University Press:  31 May 2012

C.J. Lucarotti ,
T.L. Leclerc  and
R.E. Clopton
C.J. Lucarotti*
Affiliation:
Atlantic Forestry Centre, Canadian Forest Service, Natural Resources Canada, P.O. Box 4000, Fredericton, New Brunswick, Canada E3B 5P7
T.L. Leclerc
Affiliation:
Atlantic Forestry Centre, Canadian Forest Service, Natural Resources Canada, P.O. Box 4000, Fredericton, New Brunswick, Canada E3B 5P7
R.E. Clopton
Affiliation:
Division of Science and Technology, Peru State College, Peru, Nebraska, 68421 United States
*
1 Author to whom all correspondence should be addressed.
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Abstract

The gregarine, Leidyana canadensis Clopton and Lucarotti was found infecting the guts of larvae in a declining population of the hemlock looper, Lambdina fiscellaria fiscellaria (Guenée), in Charlotte County, New Brunswick. Total mortality, in rearing, of field-collected larvae and pupae was 75.5% in 1993 and 89.2% in 1994. Leidyana canadensis infections were present in 60.1 and 80.5% of these dead insects in the two respective years. The incidence of L. canadensis in larvae that died in rearing was greater than 50% for all instars except those collected in the fifth instar, where the incidence was below 30%. Gregarine infections were present in first-instar larvae on the first days of collection for both years and, in 1994, 74% of all first-instar larvae collected were infected with L. canadensis. Of 678 larvae collected in 1994, 73 survived to adults and, of these, 44 had harbored L. canadensis as larvae. The incidence of other microbes and parasitoids in dead larvae and pupae is also reported.

Résumé

On a constaté que le grégarien Leidyana canadensis Clopton et Lucarotti contaminait les intestins de larves d’une population en dépérissement de l’arpenteuse de la pruche, Lambdina fiscellaria fiscellaria (Guenée) dans le comté de Charlotte au Nouveau-Brunswick. La mortalité totale en élevage de larves et de nymphes prélevées sur le terrain a été de 75,5% en 1993 et de 89,2% en 1994. L’infection à L. canadensis était présente dans 60,1 et 80,5% de ces insectes morts les deux années respectives. L’incidence de L. canadensis dans les larves mortes en élevage était supérieure à 50% pour tous les stades larvaires, sauf pour les larves prélevées au cinquième stade, où l’incidence était inférieure à 30%. Les infections à grégarien étaient présentes dans les larves au premier stade dés premiers prélèvements dés deux années et, en 1994, 74% de toutes les larves prélevées au premier stade étaient contaminées par L. canadensis. Sur les 678 larves prélevées en 1994, 73 ont survécu jusqu’à l’adulte et, de ce nombre, 44 avaient hébergé L. canadensis à l’état larvaire. On signale également une incidence d’autres microbes et parasitoïdes dans des larves et des nymphes mortes.

Type
Articles
Information
The Canadian Entomologist , Volume 130 , Issue 5 , October 1998 , pp. 583 - 594
Copyright
Copyright © Entomological Society of Canada 1998

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