Sunflower

All Sunflower Content

Close-up of several black caterpillars feeding on a green sunflower leaf.

Checkerspot Caterpillars in Sunflower

While scouting sunflower near Sturgis this week, we came across outbreak levels of checkerspot caterpillars that were defoliating the plants. Similar sightings have been reported throughout Western and Central South Dakota in recent weeks.

Gray beetle with long antennae that are alternating white and black pattern on green leaf petiole.

Dectes Stem Borer Adults Active in Sunflower

In South Dakota, one of the insects that is commonly observed in sunflower is the Dectes stem borer larva. At this point in the season, adults are beginning to become active with females laying eggs in sunflower plants.

sunflower head with maggots

What Are Those Small Brown Things Sticking Out of Sunflower Heads?

A few days ago, I received a couple of calls about small orange/tan colored sacs sticking out of sunflower heads and small black spots on heads. The brown structures are sunflower seed maggot pupae and the damage described is caused by its larvae.