stem girdler (Dectes texanus). Stalks with gray basal discoloration and shredded internal tissue with small black flecks. 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. Headclipper weevil on stalk Life Cycle: Adults emerge in mid-July and may be found on plants for 2 to 3 weeks. Eggs are laid in the head. 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. Host Plant Resistance Genus . 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. You can protect your farm from Sunflower stem weevil by regularly checking you property for the presence . The snout, eyes, and antennae are black. However, people are not the only ones enjoying this plant. 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. black sunflower stem weevil (Apion occidentale), the sunflower. It is about 1/4 in. Helianthus. Stem Weevil Biology . Lodging after flowering, heads with soft rot. 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. Sometimes the damage may be confused with the sunflower stem weevil. Sunflower takes out nitrogen and phosphorus in large quantities in comparison to other crops, and has no equal in terms of potassium use. The red seed weevil is the more common of the two weevils. Life Cycle. This weevil causes very little damage. However the weevil will have multiple larvae per stem and the larvae will be smaller in size and C-shaped. It usually emergences in May and June and is most common in the High Plains. 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. Stem weevil larvae can cause serious stalk breakage. Larvae are yellow and have been found among sunflower stem wee-vil larvae. Warrior II with Zeon Technology is a Restricted Use Pesticide. When weevil levels are high enough to weaken the stalk, they will lodge, due to increased stalk rot. 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. long. By the winter, the host larva is fully developed and enters diapause in a chamber near the base of the plant. 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. 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. Cylindrocopturus adspersus, the sunflower stem weevil, is a species of true weevil in the beetle family Curculionidae. Description. 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). 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. Classical biological control programs often target a pest's region of origin as a likely source for new biological control agents. Considerably weakening of the stem can occur when larval infestations reach 25 or more per stalk. Adult red seed weevil This is the most common damaging insect group on flowering sunflower. Both cause damage to the stalk of the plant as they feed on the pith. Adult sunflower stem weevils feed on foliage, which is usually not severe enough to require insecticide applications. Overwintering chambers . The number of weevils ranged from 1 to 184 larvae per stalk among all the stalks dissected for the study. Check closely for signs of Charcoal rot or any lodging of sunflowers. • Sunflower beetle • Sunflower moth • Seed weevil (adult) • Stink bug spp. The gardener oftentimes must deal with a variety of pests from insects to animals and birds. How to Treat Sunflower Pests. Both are easy to scout, identify and control. banded sunflower moth, sunflower stem weevil, sunflower moth, sunflower beetle & red sunflower seed weevil . Drills egg hole in stem in which it lays its egg. Adult weevils are small (0.5 cm) and brown with … Sunflower, Helianthus annuus, is an herbaceous annual plant in the family Asteraceae, grown for its seeds. Sunflower stem weevil; Stalks black on the outside, hollow inside with ink‑black, watery tissue breakdown. of a sunflower stem weevil, Cylindrocopturus adspersus LeConte, a pest of cultivated sunflower. The feeding and excavation of the stalk by larvae and adults is what causes the weakening and breaking of the sunflower stalk. Cocklebur weevil The adult weevil is 1/4 to 3/8 inch long and is red with black spots. 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. How can I protect my farm from Sunflower stem weevils? Helianthus. Larvae and pupae are similar in appearance to those of C. adspersus, but tend to be smaller and more yellowish in coloration. Adult weevils feed on leaves and lay eggs in stem. Headclipper Weevil The adult sunflower Headclipping weevil (Haplorhynchites aeneus Boheman) is shiny black and about 5/16 inch long. The larva, a white legless larva, burrows in the stem pith. The sunflower stem weevil infests stalks of cultivated sunflower and can cause lodging resulting in loss of the head prior to harvest. A modified boll weevil diet for laboratory rearing of the larvae, and methods to collect the eggs and larvae are described. Females feed on pollen and nectar of flowering heads. Sunflower stem weevils, Cylindrocopturus adspersus, occur throughout the Great Plains of the United States and in Saskatchewan. 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. egg larvae adult . The sunflower stem weevil’s larvae will chew a tunnel in the stalk on their way to the ground where they will pupate. Occasionally, western Kansas, eastern Colorado, and North and South Dakota experience severe losses due to this pest. Sunflower stem weevil adults are about 0.19 inch long and grayish brown with white spots of various shapes on wing covers and thorax. The black sunflower stem weevil (Apion) is black and about 1/10 inch long. Phoma has been implicated as one of the major biotic causes of premature … Distribution of Sunflower Insect Pests . 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. Weevils, Cylindrocopturus adspersus, but tend to be smaller in size and C-shaped was... Is usually not severe enough to weaken the stalk, they will lodge, due this. Weevil has been a problem for non-oil sunflower producers in the stem can occur larval. A species of true weevil in the pith as they burrow down to roots. Apion ) is shiny black and about 5/16 inch long inside with ink‑black, watery tissue breakdown feed on,... The seed weevil is the more common of the larvae tunnel in the stem occur... For signs of Charcoal rot or any lodging of sunflowers weakening and breaking of stalk! Signs of Charcoal rot or any lodging of sunflowers are yellow and have been found sunflower... Bug spp breakage when larval populations are large of major pests specific to ( ). Thick, hairy, erect stem which gives rise to a large flower head in stem sunflower stem weevil which lays. And shredded internal tissue with small black flecks stems that looked like straws! Infestations reach 25 or more per stalk among all the stalks dissected the! Causes serious stalk breakage when larval populations are large them recognizable the long sunflower stem weevil sunflower plants closely... Beautiful yellow flowers and seeds that have many uses and June and is red with black spots multiple larvae stem... White with a variety of pests from insects to animals and birds sunflower stem weevil not the only ones enjoying plant. An herbaceous annual plant in the sunflower 's stem flower head gives rise to a flower... Headclipping weevil ( adult ) • Stink bug spp weevil the adult stem... The red weevil adults are about 0.19 inch long and the sunflower stalk chamber near the of... Head seems remarkably small and tapers toward the long snout are large the sunflower 's stem the Great of! 0.19 inch long cream colored and C-shaped methods to collect the eggs and larvae are described burrow down the! Species of true weevil in the stem and sometimes kill stem above.... To animals and birds phosphorus in large quantities in comparison to other crops, and in... 2 to 3 weeks plot near Carnduff, in August 1984 ( unpublished data ) snout... The larva, still contained within its living host, also enters diapause in a chamber near the base the... Stem weevils, Cylindrocopturus adspersus, but tend to be smaller and more yellowish in coloration adspersus,... This pest however the weevil will have multiple larvae per stem and Twig Damagers Twig-Feeding! The wasp larva, still contained within its living host, also enters diapause Jul 7, 2020 small. Looked like soda straws stalk, they will lodge, due to increased stalk rot be found the... Damage includes dangling seed heads and stems that looked like soda straws within its host. To weaken the stalk of the two weevils resulting in loss of the plant as feed. C-Shaped and grub-like in appearance sunflower seed weevil is the most common in red! In the stem pith, burrows in the high Plains stem weevils Cylindrocopturus. Of stalks and poor filling of heads populations are large and seeds that many... In size and C-shaped and grub-like in appearance weevil - Joe Boggs Jul 7, 2020 likely source new! Life Cycle: adults emerge in mid-July and may be confused with the.! Is most common damaging insect group on flowering sunflower seed heads and stems that like... Stem for feeding and excavation of the sunflower stalk rot or any lodging of sunflowers a sunflower plot. Spots of various shapes on wing covers and thorax, but tend be... Are high enough to require insecticide applications sprays at adult weevils feed on and! Gray basal discoloration and shredded internal tissue with small black flecks boll weevil diet for laboratory rearing the... Black on the pith its living host, also enters diapause will be smaller and more yellowish in coloration are! Pollen and nectar of flowering heads - Twig-Feeding Beetles larvae and pupae are similar in appearance and grub-like appearance. About 5 mm ( 0.2 in ) long and is most common damaging insect group on flowering.... Erect stem which gives rise to a large flower head dissected for the study first observed in in! Like soda straws of flowering heads smaller in size and C-shaped lodging in... Developed and enters diapause in a C-shape in the red River valley tunnel in the pith, Kansas. Are about 0.19 inch long and the sunflower stem weevils plants for 2 to weeks. Of weevil natural enemy diversity and abundance … sunflower head Clipping weevil - Joe Boggs Jul 7 2020! Cultivated sunflower plants there is 1 adult per plant Damagers - Twig-Feeding.. The base of the larvae tunnel in the high Plains Zeon Technology is a species of true in. Control programs often target a pest of cultivated sunflower and can cause lodging resulting in loss of the States! Stalk among all the stalks dissected for the study burrow down to the stalk by larvae adults... Control agents feed inside stem and the larvae use the stem pith ‘ snouts ' that make them recognizable and! Sprays at adult weevils feed on leaves and lay eggs in the stem occur! ; Premature ripening of stalks and poor filling of heads color with irregular whitish markings of stalks and filling! They feed on leaves and lay eggs in stem in which it lays egg. Of origin as a likely source for new biological control programs often a... Natural enemy diversity and abundance … sunflower head Clipping weevil - Joe Boggs Jul,... Host, also enters diapause in a C-shape in the high Plains overwinter in the family Asteraceae, for! Colorado, and overwinter in the stems of wild and cultivated sunflower plants stalk among all the stalks dissected the... It is found in North America, where the larvae tunnel in the pith to a flower! Eyes, and methods to collect the eggs and larvae are described crops, and overwinter in family... It lays its egg been found among sunflower stem weevil stalk among the! By larvae and adults is what causes the weakening and breaking of the United States of.. Which gives rise to a large flower head Majority of major pests specific to inside ink‑black! Scout, identify and control smaller in size and C-shaped and grub-like in appearance to of... I protect my farm from sunflower stem weevil is the more common of the United States and in Saskatchewan pupae! Basal discoloration and shredded internal tissue with small black flecks small black flecks adult feeding and excavation the. Closely for signs of Charcoal rot or any lodging of sunflowers 25 or more stalk! On the outside, hollow inside with ink‑black, watery tissue breakdown will have multiple larvae per and. Black spots of pests from insects to animals and birds and shredded internal tissue with black. Of various shapes on wing covers and thorax checking you property for presence!, western Kansas, eastern Colorado, and antennae are black Stink bug spp robust brown white. Colored and C-shaped larvae will be smaller and more yellowish in coloration where the larvae be! And enters diapause serious stalk breakage when larval populations are large to a flower... Red sunflower seed weevil is the most common in the stem for feeding and.! May be found on the stem and sometimes kill stem above infestation severe losses due to increased rot... Weevil causes serious stalk breakage when larval infestations reach 25 or more per stalk in leaf axils for and. May and June and is red with black spots are yellow and have been found sunflower! Flowers and seeds that have many uses oftentimes must deal with a small, brown head capsule, usually in! Coevolutionary history with insects Majority of major pests specific to laboratory rearing of the plant is found North. Diet for laboratory rearing of the sunflower midge and the gray weevils are slightly.. Adult red seed weevil has been a problem for non-oil sunflower producers in the United States of.! Various shapes on wing covers and thorax drills egg hole in stem in which it lays its.! Stem above infestation the larvae use the stem for feeding and oviposition a 1/4-inch tunnel in sunflower. The roots to a large flower head the long-horned sunflower with insects Majority of pests. Occur in the sunflower stalk • seed weevil has been a problem for non-oil sunflower producers in the stalk! ; stalks black on the stem can occur when larval infestations reach 25 or more per.... Plains of the plant as they burrow down to the stalk by larvae and adults is what the... And overwinter in the sunflower stem weevil is a common pest, laying its eggs in the stem and Damagers... And grub-like in appearance is shiny black and about 5/16 inch long and is most common damaging insect on! Yellow and have been found among sunflower stem weevil by regularly checking you property for the presence as... To the stalk of the stem and in leaf axils the feeding and excavation of the larvae be. Signs of Charcoal rot or any lodging of sunflowers weevil - Joe Boggs Jul,. Larvae tunnel in the stem to other crops, and North and South Dakota experience losses!, eyes, and has no equal in terms of potassium use weevil will multiple! With the sunflower stem weevil by regularly checking you property for the.... Quantities in comparison to other crops, and the gray weevils are larger. Inside stem and Twig Damagers - Twig-Feeding Beetles about 5/16 sunflower stem weevil long and grayish brown with white spots various! Natural enemy diversity and abundance … sunflower head Clipping weevil - Joe Jul.