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Brown spots at base of individual florets or absence of ray flowers, cupping of heads is symptom. Sunflower headclipping weevil Black weevil, about .25 in. long, causes head drop. Haplorynchites aeneus Sunflower beetle Adult is .25 in. long with yellow strips length of wing Zygogramma exclamationis covers. Humpback yellow larvae causes large areas of defoliation. Sunflower maggot Adult a yellow fly with dark wing markings, smaller than Strauzia longipennis housefly. Maggots burrow in stem. Red sunflower seed weevil Adult about 1/8 in. long, rusty colored, and found in head. Smicronyx fulvus Adult female drills egg hole in developing seed and lays egg in hole. Larvae internal to seed; white legless with dark head capsule.
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