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Trap cropping to manage the red sunflower seed weevil in oilseed sunflower

Published online by Cambridge University Press:  30 October 2009

Gary J. Brewer  and
Gene Schmidt
Gary J. Brewer
Affiliation:
Entomologist Research Specialist, Department of Entomology, North Dakota State University, Fargo, ND 58105
Gene Schmidt
Affiliation:
Research Specialist, Department of Entomology, North Dakota State University, Fargo, ND 58105
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Abstract

The red sunflower seed weevil, Smicronyx fulvus LeConte, is a major pest of sunflower in North and South Dakota and Minnesota. Typically, insecticides are used to reduce oviposition and prevent economically damaging larval populations from developing. In a test of a reduced-pesticide alternative, we planted early maturing sunflower in the margins around commercial fields of oilseed sunflower. The margins flowered earlier than the field interiors and acted as a trap for the red sunflower seed weevil. They were treated with an insecticide while the trap rows were blooming and before the field interior began to flower. Conventional fields entirely treated with insecticide served as checks. We compared the trap and check fields with regard to yield, the fraction of larval-damaged seeds, and economic costs (insect damage and the cost of insecticide materials and application). Yield and larval damage of seeds were comparable between check and trap fields. However, the economic costs of weevil control in the check fields was greater than in the trap fields. Trap cropping is a recommended strategy for the red sunflower seed weevil, especially where economically damaging populations of the weevil are expected.

Keywords

Smicronyx fulvussunflowerHelianthus annuus
Type
Articles
Information
American Journal of Alternative Agriculture , Volume 10 , Issue 4 , December 1995 , pp. 184 - 187
Copyright
Copyright © Cambridge University Press 1995

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