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ECONOMIC INJURY LEVELS FOR THE RED SUNFLOWER SEED WEEVIL (COLEOPTERA: CURCULIONIDAE) INFESTING OILSEED SUNFLOWER

Published online by Cambridge University Press:  31 May 2012

Chengwang Peng  and
Gary J. Brewer
Chengwang Peng
Affiliation:
Department of Entomology, North Dakota State University, Fargo, North Dakota, USA 58105
Gary J. Brewer
Affiliation:
Department of Entomology, North Dakota State University, Fargo, North Dakota, USA 58105
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Abstract

The control of the red sunflower seed weevil, Smicronyx fulvus LeConte, relies on the use of insecticides. An economic injury level is essential to the judicious deployment of insecticidal control. Field studies were conducted in 1992 and 1993 to quantify the weight loss and oil content loss of damaged kernels as a result of larval infestation and the relationship between the adult weevil population and the subsequent number of damaged achenes. We found that for each weevil sampled in plant stages R5.0–5.3, 26.88 damaged achenes resulted. Damaged kernels lost an average of 9.86 ± 2.36 mg (mean ± SD) per kernel, approximately equal to the amount consumed by a single larva. The oil content loss in damaged kernels was 3.34%. Economic injury levels were calculated as a function of the cost of controls, the market value, and the plant population density. Use of adult weevil counts when most plants in the fields are in plant stages R5.0–5.3 are recommended for calculating economic status.

Résumé

La lutte contre le charançon parasite du tournesol Smicronyx fulvus LeConte se fait au moyen d’insecticides. Il est essentiel de déterminer un seuil économique de dommage pour élaborer un programme judicieux de lutte contre l’insecte. Des études sur le terrain en 1992 et 1993 ont permis de quantifier la perte de masse et la diminution du contenu en huile des graines endommagées à la suite de l’infestation larvaire et d’établir la relation entre la population de charançons adultes et le nombre d’alkènes qui risquent d’être endommagés. Nous avons constaté que, pour chaque charançon échantillonné chez les stades R5,0–5,3 de la plante, 26,88 akènes étaient endommagés. Les graines endommagés avaient subi une perte moyenne de 9,86 ± 2,36 mg (moyenne ± écart type) par graine, ce qui équivaut à peu près à la quantité consommée par une larve. La quantité d’huile perdue dans les graines endommagés a été évaluée à 3,34%. Les seuils économiques des dommages ont été calculés en tenant compte du coût relié à la lutte, de la valeur marchande de la population de plants et de sa densité. Le dénombrement des charançons adultes au moment où la plupart des plants sont aux stades R5,0–5,3 est idéal pour calculer le statut économique.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 127 , Issue 4 , August 1995 , pp. 561 - 568
Copyright
Copyright © Entomological Society of Canada 1995

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References

Braness, G.A. 1978. Bionomics and Control of Smicronyx fulvus Lec. (Coleoptera: Curculionidae). M.S. thesis, North Dakota State University, Fargo, ND. 94 pp.Google Scholar
Calvin, D.D. 1985. Revision and Reevaluation of a Decision Model for Second Generation European Corn Borer in Kansas. Ph.D. dissertation, Kansas State University, Manhattan, KS. 146 pp.Google Scholar
Calvin, D.D., Welch, S.M., and Poston, F.L.. 1988. Evaluation of a management model for second-generation European corn borer (Lepidoptera: Pyralidae) for use in Kansas. Journal of Economic Entomology 81: 335–343.CrossRefGoogle Scholar
Charlet, L.D., Kopp, D.D., and Oseto, C.Y.. 1987. Sunflower: Their history and associated insect community in the Northern Great Plains. Bulletin of the Entomological Society of America 33: 69–75.CrossRefGoogle Scholar
Korman, A.K., and Oseto, C.Y.. 1989. Structure of the female reproductive system and maturation of oocytes in Smicronyx fulvus (Coleoptera: Curculionidae). Annals of the Entomological Society of America 82: 94–100.CrossRefGoogle Scholar
McBride, D.K., Brewer, G.J., and Charlet, L.D.. 1992. Sunflower Seed Weevils. North Dakota State University Cooperative Extension Service Bulletin E–817: 8 pp.Google Scholar
North Dakota Agricultural Statistics Service. 1991. North Dakota Agricultural Statistics. Fargo, ND. 102 pp.Google Scholar
Oseto, C.Y., and Braness, G.A.. 1979. Bionomics of Smicronyx fulvus (Coleoptera: Curculionidae) on cultivated sunflower, Helianthus annuus. Annals of the Entomological Society of America 72: 524–528.CrossRefGoogle Scholar
Oseto, C.Y., and Braness, G.A. 1980. Chemical control and bioeconomics of Smicronyx fulvus on cultivated sunflower in North Dakota. Journal of Economic Entomology 73: 218–220.CrossRefGoogle Scholar
Oseto, C.Y., and Burr, W.F.. 1990. Timing insecticide applications for control of the red sunflower seed weevil (Coleoptera: Curculionidae) on cultivated sunflower. Journal of Agricultural Entomology 7: 337–341.Google Scholar
Oseto, C.Y., Busacca, J.D., and Charlet, L.D.. 1987. Relationship of sunflower planting dates to damage by Smicronyx fulvus (Coleoptera: Curculionidae) in North Dakota. Journal of Economic Entomology 80: 190–192.CrossRefGoogle Scholar
Oseto, C.Y., and Korman, A.K.. 1986. Sunflower development and achene damage caused by seed weevil, Smicronyx fulvus (Coleoptera: Curculionidae). Journal of Economic Entomology 79: 355–358.CrossRefGoogle Scholar
Pedigo, L.P. 1989. Entomology and Pest Management. Macmillan Publishing Company, New York, NY. 646 pp.Google Scholar
Peng, C., and Brewer, G. J.. 1994. Spatial distribution of the red sunflower seed weevil (Coleoptera: Curculionidae) on sunflower. Environmental Entomology 23: 1101–1105.CrossRefGoogle Scholar
Poston, F.L., Pedigo, L.P., and Welch, S.M.. 1983. Economic injury levels: Reality and practicality. Bulletin of the Entomological Society of America 29: 49–53.CrossRefGoogle Scholar
SAS Institute. 1987. SAS User's Guide: Statistics. SAS Institute, Cary, NC.Google Scholar
Schneiter, A.J., and Miller, J.F.. 1981. Description of sunflower growth stages. Crop Science 21: 901–903.CrossRefGoogle Scholar
Smith, R. 1994. Why SF187 can produce more gross income per acre. The Sunflower 20: 21.Google Scholar
Smith, R.F. 1968. Recent developments in integrated control. Proceedings: Fourth Britain Insecticide and Fungicide Conference 2: 464–471.Google Scholar