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METZNERIA PAUCIPUNCTELLA ZELLER (LEPIDOPTERA: GELECHIIDAE), A MOTH INTRODUCED AGAINST SPOTTED KNAPWEED: ITS FEEDING STRATEGY AND IMPACT ON TWO INTRODUCED UROPHORA SPP. (DIPTERA: TEPHRITIDAE)1

Published online by Cambridge University Press:  31 May 2012

J.M. Story ,
K.W. Boggs ,
W.R. Good ,
P. Harris  and
R.M. Nowierski
J.M. Story
Affiliation:
Montana Agricultural Experiment Station, Western Agricultural Research Center, 580 Quast Ln., Corvallis, Montana, USA 59828
K.W. Boggs
Affiliation:
Montana Agricultural Experiment Station, Western Agricultural Research Center, 580 Quast Ln., Corvallis, Montana, USA 59828
W.R. Good
Affiliation:
Montana Agricultural Experiment Station, Western Agricultural Research Center, 580 Quast Ln., Corvallis, Montana, USA 59828
P. Harris
Affiliation:
Montana Agricultural Experiment Station, Western Agricultural Research Center, 580 Quast Ln., Corvallis, Montana, USA 59828
R.M. Nowierski
Affiliation:
Montana Agricultural Experiment Station, Western Agricultural Research Center, 580 Quast Ln., Corvallis, Montana, USA 59828
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Abstract

Metzneria paucipunctella Zeller is a seed head moth introduced for biological control of spotted knapweed, Centaurea maculosa Lamarck, in the Pacific Northwest. A cage study was conducted in Montana in 1987 and 1988 to assess the feeding strategy of the M. paucipunctella larva and its impact on two seed head flies, Urophora spp., also introduced on spotted knapweed. Each moth larva destroyed an average of 8.13 knapweed seeds. Most of the seeds were destroyed prior to seed dispersal in early September but the remaining seeds were attacked in the spring of the following year. Each larva tied an average of 7.0 seeds with silk webbing which allowed for feeding long after normal seed dispersal. Seed survival in cages containing both the moth and the two fly species (4.71 seeds per head) was significantly less than in fly-only cages (9.75 seeds per head). The moth larvae caused extensive mortality to the two Urophora species, especially during the spring months. Moth-caused mortality to U. affinis larvae increased from 19% during June through October to 67% in May of the following year. Mortality to U. quadrifasciata also occurred but did not increase significantly in the spring. Data from 10 field sites showed very little association between M. paucipunctella and the two Urophora species which suggests that the unnatural conditions associated with the cages did not increase the incidence of joint moth and fly attack to individual seed heads. The moth is a valuable biocontrol agent as it is contributing significantly to the overall consumer pressure on spotted knapweed seed heads.

Résumé

Metzneria paucipunctella Zeller, papillon vivant dans les capitules, a été introduit pour assurer le contrôle biologique de la Centaurée maculée Centaurea maculosa Lamarck dans le nord-ouest américain. L’installation de cages en 1987 et 1988 a permis d’évaluer la stratégie alimentaire des larves de M. paucipunctella et d’estimer leur impact sur deux mouches parasites des capitules, Urophora spp., également introduites pour le contrôle de la centaurée. Chaque chenille a détruit en moyenne 8,13 graines de la centaurée. La plupart des graines ont été détruites avant la dispersion au début de septembre, mais d’autres graines ont été attaquées au cours du printemps de l’année suivante. Chaque larve attachait en moyenne 7,0 graines dans une toile de soie, ce qui lui allouait une quantité de nourriture suffisante pour subsister longtemps après la période normale de dispersion des graines. La survie des graines dans les cages contenant à la fois le papillon et les deux espèces de mouches (4,71 graines per capitule) était significativement moins élevée que celle des graines dans les cages ne contenant que des mouches (9,75 graines per capitule). Les larves du papillon ont entraîné une forte mortalité chez les deux espèces d’Urophora, surtout au cours des mois de printemps. La mortalité des larves d’U. affinis attribuable au papillon, évaluée à 19% entre juin et octobre, est passée à 67% en mai de l’année suivante. Le papillon a aussi causé de la mortalité chez U. quadrifasciata, mais cette mortalité n’a pas augmenté significativement au printemps. Les données recueillies en 10 points d’échantillonnage ont révélé qu’il y avait peu de lien entre M. paucipunctella et les deux espèces d’Urophora, ce qui indique que les conditions artificielles créées par les cages n’ont pas augmenté le nombre d’attaques conjointes du papillon et des mouches par capitule. Le papillon est un agent de contrôle biologique efficace puisqu’il contribue de façon inportante à la pression de consommation générale opérée sur les capitules de la Centaurée maculée.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 5 , October 1991 , pp. 1001 - 1007
Copyright
Copyright © Entomological Society of Canada 1991

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References

Englert, W. 1973. Metzneria paucipunctella Zel. (Gelechiidae, Lepidoptera): A potential insect for the biological control of Centaurea stoebe L. in Canada. pp. 161–165in Proceedings of the Second International Symposium on Biological Control of Weeds, Rome, Italy.Google Scholar
Englert, W. 1974. Revision der gattung Metzneria Zeller (Lepid., Gelechiidae) mit Beitragen zur biologie der arten. Z. ang. Ent. 75: 381–421.CrossRefGoogle Scholar
Gillespie, R.L. 1983. Bionomics of Urophora affinis Frauenfeld, and U. quadrifasciata Meigen (Diptera: Tephritidae) in Northern Idaho. M.S. thesis, University of Idaho, Moscow, ID. 90 pp.Google Scholar
Harris, P. 1980 a. Establishment of Urophora affinis Frfld. and U. quadrifasciata (Meig.) (Diptera: Tephritidae) in Canada for the biological control of diffuse and spotted knapweed. Z. ang. Ent. 89: 504–514.CrossRefGoogle Scholar
Harris, P. 1980 b. Effects of Urophora affinis Frfld. and U. quadrifasciata (Meig.) (Diptera: Tephritidae) on Centaurea diffusa Lam. and C. maculosa Lam. (Compositae). Z. ang. Ent. 90: 190–201.CrossRefGoogle Scholar
Harris, P. 1989. The use of Tephritidae for the biological control of weeds. Biocontrol News Inf. 10(1): 7–16.Google Scholar
Harris, P., and Muir, A.. 1986. Biological control of spotted knapweed by Metzneria paucipunctella (Zeller). Canadex 641:613. Agriculture Canada.Google Scholar
Harris, P., and Myers, J.H.. 1984. Centaurea diffusa Lam. and C. maculosa Lam. s. lat., diffuse and spotted knapweed (Compositae). pp. 127–137in Biological Control Programmes Against Insects and Weeds in Canada 1969–1980. Commonwealth Agricultural Bureaux.Google Scholar
Lund, R.E. 1988. MSUSTAT (version 4.11), an interactive statistical analysis package. Research & Development Institute, Inc., Montana State University, Bozeman, MT.Google Scholar
Schoener, T.W. 1983. Field experiments on interspecific competition. Am. Nat. 122: 240–285.CrossRefGoogle Scholar
Story, J.M. 1977. Biology of spotted knapweed in Montana. pp. 31–38in Proceedings of the 1977 Knapweed Symposium, Kamloops, B.C.Google Scholar
Story, J.M. 1985. Status of biological weed control in Montana. pp. 837–842in Proceedings VI International Symposium on Biological Control of Weeds, Vancouver, B.C.Google Scholar
Story, J.M. 1989. The status of biological control of spotted and diffuse knapweed. pp. 37–42in Proceedings of the 1989 Knapweed Symposium, Bozeman, MT.Google Scholar