Sunflower Resistance to the Red Sunflower Seed Weevil (Coleoptera: Curculionidae)
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POPULATION ECOLOGY Parasitization of the Red Sunflower Seed Weevil (Coleoptera: Curculionidae) by its Larval Parasitoid Triaspis aequoris (Hymenoptera: Braconidae) in Cultivated Sunflower
The red sunßower seed weevil, Smicronyx fulvus LeConte, is a pest of sunßower in the northern and central Plains sunßower production regions. Weevil larvae feed and develop in the sunßower achene dropping to the soil to overwinter. A total of 630 parasitoids emerging from seed weevil larvae recovered fromNorth and SouthDakota andMinnesota from1991 to 1995was identiÞed as Triaspis aequoris Marti...
متن کاملImpact of combining planting date and chemical control to reduce larval densities of stem-infesting pests of sunflower in the central plains.
The guild of stem-infesting insect pests of sunflower, Helianthus annuus L., within the central Plains is a concern to producers chiefly due to losses caused by plant lodging from the sunflower stem weevil, Cylindrocopturus adspersus (LeConte) (Coleoptera: Curculionidae), and Dectes texanus texanus LeConte (Coleoptera: Cerambycidae). The incidence of a root boring moth, Pelochrista womonana (Ke...
متن کاملNonconstant Thermal Regimes Enhance Overwintering Success and Accelerate Diapause Development for Smicronyx fulvus (Coleoptera: Curculionidae).
Recent populations of the red sunflower seed weevil, Smicronyx fulvus LeConte (Coleoptera: Curculionidae), have been inconsistent or declining, particularly in North Dakota. Consequently, research on weevil biology, including development of resistant germplasm, has been limited. To determine whether cold storage of diapausing larvae could be improved, nonconstant temperature treatments (fluctua...
متن کاملBiochemistry and Physiology of Overwintering in the Mature Larva of the Sunflower Stem Weevil, Cylindrocopturus adspersus (Coleoptera: Curculionidae) in the Northern Great Plains
The sunflower stem weevil, Cylindrocopturus adspersus (LeConte), overwinters as a mature larva at the base of the stalk and in the root crown of cultivated sunflower plants. Sunflower stalks from fields known to be infested with C. adspersus larvae were collected in southeastern North Dakota in October 1991. Larvae from stalks kept outdoors accumulated a high whole-body concentration of trehalo...
متن کاملNonlinear degree-day models for postdiapause development of the sunflower stem weevil (Coleoptera: Curculionidae).
The sunflower stem weevil, Cylindrocopturus adspersus (LeConte) (Coleoptera: Curculionidae), has caused yield losses across much of the western Great Plains. Little is known about the field biology of this pest. Simple prediction models, such as degree-day models, are an integral tool for development of C. adspersus management strategies. Using data collected in Colorado, Kansas, and Nebraska, ...
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