Adult weevils feed on leaves and lay eggs in stem. banded sunflower moth, sunflower stem weevil, sunflower moth, sunflower beetle & red sunflower seed weevil . Growers attempting to use planting dates to control any sunflower insect should be aware of all the insect pests they are likely to have, not just one species. When parasitizing the sunflower stem weevil, the female wasp lays a single egg into a first instar larva, which feeds just under the epidermis of the stem where it is within reach of the wasp's ovipositor. A modified boll weevil diet for laboratory rearing of the larvae, and methods to collect the eggs and larvae are described. Considerably weakening of the stem can occur when larval infestations reach 25 or more per stalk. The larvae use the stem for feeding and overwintering. Adult sunflower stem weevils feed on foliage, which is usually not severe enough to require insecticide applications. Sunflower stem weevils, Cylindrocopturus adspersus, occur throughout the Great Plains of the United States and in Saskatchewan. egg larvae adult . The peculiar handiwork of the sunflower headclipping weevil (Haplorhynchites aeneus) is just getting underway this season on purple coneflowers (Echinaceapurpurea) and other members of the aster family (Asteraceae) in southwest Ohio. Drills egg hole in stem in which it lays its egg. The sunflower stem weevil, Cylindrocopturus adspersus (LeConte), infests wild and cultivated sunflowers in Colorado, Texas, North Dakota, South Dakota, and Minnesota (Schulz 1978; Charlet 1983). Both are easy to scout, identify and control. It was first observed in Saskatchewan in a sunflower test plot near Carnduff, in August 1984 (unpublished data). Life Cycle. Females feed on pollen and nectar of flowering heads. maggot (Strauzia longipennis), and the long-horned sunflower. Sometimes the damage may be confused with the sunflower stem weevil. Host Plant Resistance Genus . It is about 1/4 in. Host plants are still required for adult feeding and oviposition. The plant has a thick, hairy, erect stem which gives rise to a large flower head. of a sunflower stem weevil, Cylindrocopturus adspersus LeConte, a pest of cultivated sunflower. The snout, eyes, and antennae are black. Larvae feed, develop, and overwinter in the stem. For the formation of 20 centners / ha of seeds, the plants need 56–58 kg / ha of nitrogen, 22 kg / ha of phosphorus, and 30 kg / ha of potassium. When weevil levels are high enough to weaken the stalk, they will lodge, due to increased stalk rot. However, early planting may increase damage by the banded sunflower moth and the sunflower stem weevil. The sunflower stem weevil, Cylindrocopturus adspersus LeConte (Coleoptera: Curculionidae), has attacked cultivated sunflower, Helianthus annuus Linnaeus (Asteraceae), throughout its history in North America (Charlet et al., 1997).A single generation of weevils emerges in late spring each year. The red weevil adults are 0.1 to 0.12 inch long and the gray weevils are slightly larger. Sunflower stem weevil (adult) Apply esfenvalerate, beta-cyfluthrin, deltamethrin , chlorpyrifos, lambda/gamma-cyhalothrin, or zeta-cypermethrin products at the rates listed for sunflower moth. The red seed weevil is the more common of the two weevils. Cocklebur weevil The adult weevil is 1/4 to 3/8 inch long and is red with black spots. Sunflower stem weevil Cylindrocopturus adspersus. Stem Weevil Biology . A robust brown and white spotted snout beetle found on the stem and in leaf axils. Adult weevils are small (0.5 cm) and brown with … However, since the pathogen Phoma macdonaldii Boerma has been isolated from adults they are highly suspected of vectoring Phoma black stem disease in sunflower fields. Adults feed on leaf margins during the day & larvae over leaf surface at night Overwinter as adults in soil Eggs laid on stem or underside of leaves . • Sunflower beetle • Sunflower moth • Seed weevil (adult) • Stink bug spp. As with other cultivated crops that are harvested at the field scale, some seed may escape harvest, mostly from shattering, particularly when infected with sclerotinia. Both cause damage to the stalk of the plant as they feed on the pith. Helianthus. The large larvae leave a 1/4-inch tunnel in the pith as they burrow down to the roots. Headclipper Weevil The adult sunflower Headclipping weevil (Haplorhynchites aeneus Boheman) is shiny black and about 5/16 inch long. Sunflower Beetle . 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