stem girdler (Dectes texanus). Sunflower stem weevils, Cylindrocopturus adspersus, occur throughout the Great Plains of the United States and in Saskatchewan. 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 damage includes dangling seed heads and stems that looked like soda straws. Life Cycle. Sunflower stem weevil Cylindrocopturus adspersus. Larvae are cream colored and C-shaped and grub-like in appearance. Chapter Eight: Stem and Twig Damagers - Twig-Feeding Beetles. Bacterial stalk rot; Premature ripening of stalks and poor filling of heads. The sunflower stem weevil infests stalks of cultivated sunflower and can cause lodging resulting in loss of the head prior to harvest. maggot (Strauzia longipennis), and the long-horned sunflower. B5. Damage by larvae of sunflower stem weevil causes serious stalk breakage when larval populations are large. 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. When weevil levels are high enough to weaken the stalk, they will lodge, due to increased stalk rot. However the weevil will have multiple larvae per stem and the larvae will be smaller in size and C-shaped. Headclipper weevil on stalk Life Cycle: Adults emerge in mid-July and may be found on plants for 2 to 3 weeks. 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. The larvae use the stem for feeding and overwintering. 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. However, early planting may increase damage by the banded sunflower moth and the sunflower stem weevil. The head seems remarkably small and tapers toward the long snout. Direct sprays at adult weevils when there is 1 adult per plant. It is found in North America, where the larvae tunnel in the stems of wild and cultivated sunflower plants. Stem Weevil Biology . 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. However, people are not the only ones enjoying this plant. Larvae are yellow and have been found among sunflower stem wee-vil larvae. Adult weevils are small (0.5 cm) and brown with … 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 black sunflower stem weevil (Apion) is black and about 1/10 inch long. You can protect your farm from Sunflower stem weevil by regularly checking you property for the presence . Females feed on pollen and nectar of flowering heads. How can I protect my farm from Sunflower stem weevils? Cocklebur weevil The adult weevil is 1/4 to 3/8 inch long and is red with black spots. The large larvae leave a 1/4-inch tunnel in the pith as they burrow down to the roots. It was first observed in Saskatchewan in a sunflower test plot near Carnduff, in August 1984 (unpublished data). Distribution of Sunflower Insect Pests . We conducted surveys of weevil natural enemy diversity and abundance … 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. Larvae are 0.25 inch long at maturity. Overwintering chambers . Check closely for signs of Charcoal rot or any lodging of sunflowers. Root … The snout, eyes, and antennae are black. Phoma has been implicated as one of the major biotic causes of premature … This weevil causes very little damage. Classical biological control programs often target a pest's region of origin as a likely source for new biological control agents. 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