Parasitization of the Red Sunflower Seed Weevil (Coleoptera: Curculionidae) by its Larval ParasitoidTriaspis aequoris(Hymenoptera: Braconidae) in Cultivated Sunflower

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...

Sunflower Resistance to the Red Sunflower Seed Weevil (Coleoptera: Curculionidae)

Nonlinear 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, ...

Impact 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...

Seed Distribution Uniformity of Sunflower

In this study, four different type seeders were evaluated for seed spacing, depth uniformity, and plant emergence at three forward speeds (3.6, 5.4, and 7.2 km h-1). The planter types were: no-till planter, precision vacuum planter, universal planter, and semi-automatic potato planter. The sowing uniformity of the horizontal distribution of seeds was described by using the multiple index, the m...