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A new standard pupation shelter for sampling pupae and estimating mortality of the hemlock looper (Lepidoptera: Geometridae)

  • Christian Hébert (a1), Luc Jobin (a1), Richard Berthiaume (a1), Jean-François Mouton (a2), Alain Dupont (a3) and Clément Bordeleau (a4)...

Abstract

A new standard pupation shelter for sampling hemlock looper (Lambdina fiscellaria) pupae is described and compared with the burlap band method developed by Otvos (1974; The Canadian Entomologist106: 329–31). The new pupation shelter is placed on the bole, at breast height or in the crown, to estimate population abundance and mortality. The utilization of two shelters at breast height was as efficient as the use of burlap bands to estimate hemlock looper abundance and more efficient for sampling braconid cocoons. It provided reliable estimates of braconid and tachinid parasitism but overestimated that by ichneumonids. This new pupation shelter is an inexpensive tool that can be used easily by nonspecialized personnel, thus allowing increases in the number of sample plots, which is necessary to improve detection of outbreaks of the hemlock looper. This new shelter could be used to sample other lepidopterans whose late-instar larvae aggregate in concealed pupation sites.

Un nouveau gîte de nymphose standard pour échantillonner les chrysalides de l'arpenteuse de la pruche (Lambdina fiscellaria) est décrit et comparé avec la méthode des bandes de jute développée par Otvos (1974; The Canadian Entomologist106: 329–31). Le nouveau gîte de nymphose est placé sur le tronc, à hauteur de poitrine ou dans la cime, pour estimer l'abondance et la mortalité des populations. L'utilisation de deux gîtes de nymphose à hauteur de poitrine est aussi efficace que les bandes de jute pour estimer l'abondance de l'arpenteuse de la pruche et plus efficace pour échantillonner les cocons de braconidae. Il procure des estimations fiables du parasitisme par les braconidae et les tachinidae mais surestime celui fait par les ichneumonidae. Ce nouveau gîte de nymphose est un outil peu coûteux qui peut être utilisé par du personnel non-spécialisé, permettant ainsi d'augmenter le nombre de parcelles d'échantillonnage nécessaires afin d'améliorer la détection des épidémies de l'arpenteuse de la pruche. Ce nouveau gîte de nymphose pourrait être utilisé pour échantillonner d'autres Lépidoptères dont les larves âgées se rassemblent dans des sites de pupaison leur permettant de se dissimuler.

Copyright

Corresponding author

1Corresponding author (e-mail: Christian.hebert@nrcan.gc.ca).

References

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