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Sunflower Moths Present in South Dakota Sunflower
The sunflower moth and its subsequent caterpillar are sunflower pests that need to be scouted for after the inflorescences begin to open through head maturity. Sunflower heads are most-susceptible to caterpillar damage from the onset of anthesis to when the petals begin drying.
Bees and Other Pollinators Visiting Sunflower
While insecticides are often necessary to reduce pest populations and prevent yield loss in sunflower, it is important to consider the impact they may have on beneficial insects, like bees and other native pollinators.
National Sunflower Association 2021 Sunflower Survey
Volunteers from private industry and SDSU Extension will soon be visiting South Dakota sunflower fields to participate in the biennial sunflower survey. The survey aims to evaluate yields and production practices along with pest pressure from weeds, insects, diseases and birds.
Pollinators Are Active in Sunflower
While scouting sunflowers, it’s hard to not notice the constant buzzing present in the field, which is produced by numerous species of bees. While sunflower varieties grown in the United States were bred for self-fertility, there is evidence that both honey bees and native wild bees can improve pollination.
Red and Gray Sunflower Seed Weevil Identification
While scouting sunflower, it’s not uncommon to observe both red and gray sunflower seed weevils on the same developing head. Differentiating these two species isn’t difficult, as there are obvious size and coloration differences.
Palmer Amaranth: Now Is the Time to Scout
South Dakota State University (SDSU) Extension encourages farmers, ranchers and other landowners to start scouting for Palmer amaranth, a weed that has been rapidly spreading north into the United States and is likely to be glyphosate-resistant.
Red Sunflower Seed Weevils Are Active
Red sunflower seed weevils are active in South Dakota sunflowers. We noticed that many fields at R5 stages are already being sprayed, but scouting should still continue in those fields after application, and it should begin for fields that will reach the R5 stage within the next week.
Flea Beetles Causing Issues in Canola
Large flea beetle populations in canola have been observed in neighboring states and within South Dakota. The hot, dry and sunny conditions that we have been experiencing throughout 2021 have been ideal for flea beetle populations.
It’s Time To Start Scouting For Banded Sunflower Moths
Sunflowers throughout South Dakota are quickly approaching the R3 growth stage, which means it’s time to start scouting for banded sunflower moths. Banded sunflower moths are capable of reducing yields due to their caterpillars feeding on the bracts, florets and seeds.
Dectes Stem Borer May Be More of an Issue During 2021
Dectes stem borers are an annual pest of sunflower in South Dakota. During most years, they do not cause major issues in sunflower. However, we have observed increased issues with this pest during dry years.