Written collaboratively by Ruth Beck, Charles Bush, and Febina Mathew.
A guide depicting common stem diseases of Sunflower in South Dakota.
An identification guide to Common Stem Diseases of Sunflower in South Dakota
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Did Malathion Effectively Manage Your Red Sunflower Seed Weevils?
Now that the August 31 deadline for the application of products containing malathion for red sunflower seed weevil management has passed, it is time to determine if the product was effective. South Dakota State University entomologists have received varying reports on this topic.
Aster Yellows Phytoplasma
Aster yellows is a phytoplasmal disease carried and introduced by aster leafhopper. It is known to infect over 80 different plant families, as the aster leafhopper has extremely broad feeding habits.
Is it Time to Spray Red Sunflower Seed Weevils?
Red sunflower seed weevil adult activity is well underway on sunflowers in South Dakota. Even though the red sunflower seed weevil numbers are down, we are still observing populations in South Dakota that are above threshold.