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NOTES ON THE OCCURRENCE, DISTRIBUTION, POPULATION LEVELS, AND CONTROL OF GRAPHOLITA LIBERTINA HEINR. (LEPIDOPTERA: TORTRICIDAE), A PEST OF LINGONBERRIES IN NEWFOUNDLAND1

  • Ray F. Morris (a1), B.G. Penney (a1), G. Greenslade (a2), P.A. Hendrickson (a3) and K.B. McRae (a4)...

Abstract

Grapholita libertina Heinr. larvae are a pest of economic importance in lingonberries (partridgeberries), Vaccinium vitis-idaea L. var. minus Lodd, in Newfoundland. Both domestic and export markets are affected. Surveys conducted during the period 1973–1982 to determine distribution and larval population levels, in localities where berries were harvested commercially, indicated they were infested to varying intensities in all 15 localities studied. Highest infestations occurred at Pouch Cove (5 September 1974 — 122 larvae per kilogram of ripe berries) and on Witless Bay Line (9 August 1977 — 276 larvae per kilogram of green berries).

In experiments conducted from 1980 to 1982 at six locations, there was a significant decrease in level of infestation as the crop reached maturity. Our results suggest that delaying the opening of the lingonberry harvest season until the last week of September decreased the risk of infestation.

Observations on the life history of G. libertina and a naturally occurring hymenopterous parasite are presented.

Les larves de Grapholita libertina Heinr. sont un parasite d’importance économique de l’airelle vigne-d’Ida, Vaccinium vitis-idaea L. var. minus Lodd, à Terre-Neuve. La présence de l’insecte affecte les marchés domestiques et d’exportation. Des inventaires pour suivis entre 1973–1982 dans le but de déterminer la distribution et l’abondance des larves indiquèrent que les 15 zones de production commerciale etudiées étaient infestées à différents niveaux. Les infestations les plus élevées prirent place à Pouch Cove (5 septembre 1974 — 122 larves par kilogramme de fruits mûrs) et place à Witless Bay Line (9 août 1977 — 276 larves par kilogramme de fruits verts).

Des expériences effectuées à six localités entre 1980–1982 démontrèrent que l’infestation diminue de façon significative lorsque la culture atteint la maturité. L’analyse des résultats obtenus indique que l’ouverture de la saison de récolte de l’airelle devrait être remise jusqu’à la dernière semaine de Septembre.

Des observations sur l’écologie de G. libertina et un hyménoptère parasite naturellement présent sont aussi incluses.

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References

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Hall, I.V., and Shay, J.M.. 1981. The biological flora of Canada. 3. Vaccinium vitis-idaea L. var. minus Lodd. Supplementary Account. Can. Fld. Nat. 95: 434464.
Heinrich, C. 1926. Revision of the North American Moths of the Subfamilies Laspeyresiinae and Olethreutinae. Bull. Smithson. Inst. U.S. Nat. Mus. 132: 29.
Penney, B.G., McRae, K.B., Hall, I.V., Morris, R.F., and Hendrickson, P.A.. 1985. Effect of harvest date and location on the yield of Vaccinium vitis-idaea L. var. minus Lodd in Eastern Newfoundland. Crop Res. (Hort. Res.) 25: 2126.
Ryan, A.G. 1978. Native trees and shrubs of Newfoundland and Labrador. Park Interpretation Publ. 14: 39. Parks Div., Dept. of Tourism, Govt. of Newfoundland & Labrador.
Stark, R., Hall, I.V., and Hendrickson, P.A.. 1978. The partridgeberry of Newfoundland. Canadex(Hort. Crops) 230.

NOTES ON THE OCCURRENCE, DISTRIBUTION, POPULATION LEVELS, AND CONTROL OF GRAPHOLITA LIBERTINA HEINR. (LEPIDOPTERA: TORTRICIDAE), A PEST OF LINGONBERRIES IN NEWFOUNDLAND1

  • Ray F. Morris (a1), B.G. Penney (a1), G. Greenslade (a2), P.A. Hendrickson (a3) and K.B. McRae (a4)...

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