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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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