Both weevils have pronounced ‘snouts' that make them recognizable. The larvae use the stem for feeding and overwintering. Helianthus. It usually emergences in May and June and is most common in the High Plains. 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. More recently the sunflower midge and the seed weevil has been a problem for non-oil sunflower producers in the Red River valley. The damage includes dangling seed heads and stems that looked like soda straws. 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 . Classical biological control programs often target a pest's region of origin as a likely source for new biological control agents. Here, we use this approach to search for biological control agents of the sunflower stem weevil (Cylindrocopturus adspersus LeConte), an economically important pest of commercial sunflower. References: Cranshaw, W. (2004). You can protect your farm from Sunflower stem weevil by regularly checking you property for the presence . Sunflower stem weevil (adult) Apply esfenvalerate, beta-cyfluthrin, deltamethrin , chlorpyrifos, lambda/gamma-cyhalothrin, or zeta-cypermethrin products at the rates listed for sunflower moth. Adult sunflower stem weevils feed on foliage, which is usually not severe enough to require insecticide applications. As with some other insect pests, the area where sunflower stem weevil is a concern has shifted, moving from primary production areas of North Dakota and Minnesota southward into Colorado, Kansas, and Nebraska. Both are easy to scout, identify and control. Reproductives were from a non-diapausing strain of C. adspersus. A modified boll weevil diet for laboratory rearing of the larvae, and methods to collect the eggs and larvae are described. Larvae are 0.25 inch long at maturity. maggot (Strauzia longipennis), and the long-horned sunflower. B5. Occasionally, western Kansas, eastern Colorado, and North and South Dakota experience severe losses due to this pest. How can I protect my farm from Sunflower stem weevils? • Controlling sunflower stem weevil helps prevent transmission of Phoma black stem disease Key pests controlled • Banded sunflower moth • Seed weevil (adult) Refer to label for a complete list of insects. Larvae are yellow and have been found among sunflower stem wee-vil larvae. Here, we use this approach to search for biological control agents of the sunflower stem weevil (Cylindrocopturus adspersus LeConte), an economically important pest of commercial sunflower. They are creamy white with a small, brown head capsule, usually found in a C-shape in the sunflower stalk. Host Plant Resistance Genus . Bacterial stalk rot; Premature ripening of stalks and poor filling of heads. The sunflower stem weevil is a common pest, laying its eggs in the sunflower's stem. Description. The red weevil adults are 0.1 to 0.12 inch long and the gray weevils are slightly larger. long. However the weevil will have multiple larvae per stem and the larvae will be smaller in size and C-shaped. Direct sprays at adult weevils when there is 1 adult per plant. Larvae feed inside stem and sometimes kill stem above infestation. The sunflower stem weevil’s larvae will chew a tunnel in the stalk on their way to the ground where they will pupate. Damage by larvae of sunflower stem weevil causes serious stalk breakage when larval populations are large. Check closely for signs of Charcoal rot or any lodging of sunflowers. Helianthus. Root … 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. • Sunflower beetle • Sunflower moth • Seed weevil (adult) • Stink bug spp. of new pests and diseases. Warrior II with Zeon Technology is a Restricted Use Pesticide. egg larvae adult . A robust brown and white spotted snout beetle found on the stem and in leaf axils. Cultivated H. annuus as a Volunteer Weed. Larvae and pupae are similar in appearance to those of C. adspersus, but tend to be smaller and more yellowish in coloration. has 49 species Coevolutionary history with insects Majority of major pests specific to . Headclipper weevil on stalk Life Cycle: Adults emerge in mid-July and may be found on plants for 2 to 3 weeks. Much more abundant in drouthy sites and years. 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). Headclipper Weevil The adult sunflower Headclipping weevil (Haplorhynchites aeneus Boheman) is shiny black and about 5/16 inch long. Sunflower, Helianthus annuus, is an herbaceous annual plant in the family Asteraceae, grown for its seeds. The sunflower stem weevil also has been implicated in the epidemiology of sunflower pathogens, such as Phoma black stem (Phoma macdonaldii Boerma), and may predispose plants to infection by Macrophomina phaseolina (Tassi) Goid, the causative agent of charcoal stem rot in sunflowers in the southern Great Plains. Sunflower stem weevils (Cylindrocopturus adspersus) and at least 10 other species in the Curculionidae, including the red sunflower seed weevil (Smicronyx fulvus), the boll weevil (Anthonomus grandis grandis), and the plum curculio (Conotrachelus nenuphar). The peculiar handiwork of the sunflower headclipping weevil (Haplorhynchites aeneus) is just getting underway this season on purple coneflowers (Echinacea purpurea) and other members of the aster family (Asteraceae) in southwest Ohio. Drills egg hole in stem in which it lays its egg. Sunflower stem weevils, Cylindrocopturus adspersus, occur throughout the Great Plains of the United States and in Saskatchewan. Sunflowers offer the gardener both beautiful yellow flowers and seeds that have many uses. The red seed weevil is the more common of the two weevils. It was first observed in Saskatchewan in a sunflower test plot near Carnduff, in August 1984 (unpublished data). of a sunflower stem weevil, Cylindrocopturus adspersus LeConte, a pest of cultivated sunflower. Stalks with gray basal discoloration and shredded internal tissue with small black flecks. Sunflower moth Sunflower stem weevil Sunflower long -horned beetle . The black sunflower stem weevil is a small, shiny black weevil about 2.5 mm (1/10 inches) long from the base of its globose body to the end of its curved snout. 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. Phoma has been implicated as one of the major biotic causes of premature … Sunflower stem weevil adults are about 0.19 inch long and grayish brown with white spots of various shapes on wing covers and thorax. Sunflower Head Clipping Weevil - Joe Boggs Jul 7, 2020. The sunflower stem weevil infests stalks of cultivated sunflower and can cause lodging resulting in loss of the head prior to harvest. However, early planting may increase damage by the banded sunflower moth and the sunflower stem weevil. The snout, eyes, and antennae are black. This weevil causes very little damage. Sometimes the damage may be confused with the sunflower stem weevil. Cocklebur weevil The adult weevil is 1/4 to 3/8 inch long and is red with black spots. The wasp larva, still contained within its living host, also enters diapause. Cylindrocopturus adspersus, the sunflower stem weevil, is a species of true weevil in the beetle family Curculionidae. It is about 1/4 in. It is found in North America, where the larvae tunnel in the stems of wild and cultivated sunflower plants. Sunflower stem weevil Cylindrocopturus adspersus. Sunflower stem weevil; Stalks black on the outside, hollow inside with ink‑black, watery tissue breakdown. Chapter Eight: Stem and Twig Damagers - Twig-Feeding Beetles. The damage includes dangling seed heads and stems that looked like soda straws. The larva, a white legless larva, burrows in the stem pith. The plant has a thick, hairy, erect stem which gives rise to a large flower head. Lodging after flowering, heads with soft rot. We conducted surveys of weevil natural enemy diversity and abundance … Host plants are still required for adult feeding and oviposition. The plant has large, broad lower leaves which are oval and arranged alternately on the stem and smaller, narrower upper leaves which are attached individually to the stem. The feeding and excavation of the stalk by larvae and adults is what causes the weakening and breaking of the sunflower stalk. The large larvae leave a 1/4-inch tunnel in the pith as they burrow down to the roots. How to Treat Sunflower Pests. 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. Considerably weakening of the stem can occur when larval infestations reach 25 or more per stalk. Adult weevils feed on leaves and lay eggs in stem. black sunflower stem weevil (Apion occidentale), the sunflower. Feeding on sunflower plant stems, the sunflower stem weevil is ⅛- to ¼-inch long, gray-brown with white spots and black antennae, snout and eyes. The number of weevils ranged from 1 to 184 larvae per stalk among all the stalks dissected for the study. The gardener oftentimes must deal with a variety of pests from insects to animals and birds. Our objective was to determine whether altered planting periods could reduce weevil densities in confection and oilseed sunflower in the central High Plains production region. Larvae are cream colored and C-shaped and grub-like in appearance. Adult weevils are small (0.5 cm) and brown with … The Sunflower stem weevil is only known to occur in the United States of America. 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. Sunflower stem weevil – Cylindrocopturus adspersus (LeConte) 6 6 6 6 6 Sunflower maggot – Strauzia longipennis (Wiedenmann) 5 5 5, 6 Sunflower beetle – Zygogramma exclamationis (F.) 8 7, 8 8 8 8 7 8. The sunflower stem weevil also has been implicated in the transmission of Macrophomina phaseolina (Tassi) Goid, which causes charcoal stem rot in sunflower in the southern Plains. The adult sunflower stem weevil is about 5 mm (0.2 in) long and a grayish-brown color with irregular whitish markings. The sunflower stem weevil, Cylindrocopturus adspersus (LeConte) (Coleoptera: Curculionidae), is an economic pest of cultivated sunflower in both the northern and southern Great Plains of the United States and in Saskatchewan. Adult red seed weevil This is the most common damaging insect group on flowering sunflower. Overwintering chambers . However, people are not the only ones enjoying this plant. Larvae feed, develop, and overwinter in the stem. 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. 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. The native weevil … Life Cycle. Sunflower Beetle . banded sunflower moth, sunflower stem weevil, sunflower moth, sunflower beetle & red sunflower seed weevil . Stem weevil larvae can cause serious stalk breakage. Sunflower takes out nitrogen and phosphorus in large quantities in comparison to other crops, and has no equal in terms of potassium use. The black sunflower stem weevil (Apion) is black and about 1/10 inch long. The sunflower stem weevil larval counts indicated very heavy stem weevil pressure in 2002 at Akron with the mean density ranging from 20 to 60 larvae per stalk among the germplasm tested. The head seems remarkably small and tapers toward the long snout. stem girdler (Dectes texanus). Females feed on pollen and nectar of flowering heads. Stem Weevil Biology . Eggs are laid in the head. Distribution of Sunflower Insect Pests . By the winter, the host larva is fully developed and enters diapause in a chamber near the base of the plant. When weevil levels are high enough to weaken the stalk, they will lodge, due to increased stalk rot. 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