Skip to main content

Fungus Keeping Kudzu Bugs below Thresholds on Soybeans

White muscadine disease (Beauveria bassiana) on a kudzu bug. Photo credit: Jennifer Bearden

White muscadine disease (Beauveria bassiana) on a kudzu bug. Photo credit: Jennifer Bearden

Kudzu bugs are a fairly new pest for our area but are already familiar to residents in Northwest Florida.  Researchers are continuously studying new pests to make research-based control recommendations.

One research project (UGA research article) is investigating a fungus, Beauveria bassiana, that infects kudzu bugs.  Beauveria bassiana causes white muscadine disease which is fatal for many insects.  Beauveria bassiana affects kudzu bugs and seem to be holding them at bay for area farmers.

While scouting a field this week in Okaloosa County, I found several kudzu bugs that were killed by this fungus, and the population was still below the threshold in this field.  Farmers who are growing soybeans should scout their fields for kudzu bugs and look for bugs affected by this fungus.

White muscadine disease on Kudzu Bugs in soybean field. Photo credit: Jennifer Bearden

White muscadine disease on Kudzu Bugs in soybean field. Photo credit: Jennifer Bearden

The established thresholds for kudzu bugs on soybeans are currently five adults per plant pre-flower, and one immature per sweep with a sweep net post-flowering.  If populations rise above thresholds, treat the field.  Look carefully before spraying though as Beauveria bassiana may be working to reduce the population.  This will save area farmers time and money!

For more information, refer to:

Kudzu Bug Control in Soybeans (ANR-2176)

 

 

 

 

2 Comments on “Fungus Keeping Kudzu Bugs below Thresholds on Soybeans

  1. I have already contacted my local Bay co. extension office about this bug attacking my Blue Lake bean plants. There was no recommendation for pesticide but you mentioned in this article spraying the soybean field. Do you have a recommendation as a pesticide that would work on these type of bugs? I know sevin spray doesn’t work.

    • I don’t think there is a published threshold for beans. For soybeans, we use a 15-inch sweep net. One nymph per sweep would be needed to trigger a pesticide application. Pesticides that are effective on kudzu bugs can be very harsh on beneficial insects. This can cause a flush of bad insects following the pesticide application. I would check for any kudzu bugs on the ground that are infected by the fungus. Often the fungus will keep them below thresholds. If you are dead set on using a pesticide, a pyrethrin is effective on them but also will kill beneficial insects.

Leave a Reply

Your email address will not be published. Required fields are marked *