Ask EcoBeneficial!

Helpful answers to readers' questions. Go ahead - just ask EcoBeneficial

ecobeneficial-trademark-shadow-new2
Kim Eierman

Kim Eierman

Founder of EcoBeneficial!

Available for virtual and in-person landscape consulting, talks and classes.

Buy a copy of
The Pollinator Victory Garden!

Something went wrong. Please check your entries and try again.
Kudzu Beetle_Tomas Maul_Flickr

Where did the Kudzu Beetles Go?

Question:

A number of years ago, my trellised legumes were inundated with kudzu beetles for the first time. I have not seen one since. What happened?

Answer:

Thanks for your question. The kudzu beetle or kudzu bug, Megacopta cribraria, is an invasive insect from Asia. It was first noticed in the U.S. in Georgia in 2009 and is now prevalent throughout the Southeastern U.S.  This little pest has piercing-sucking mouthparts and feeds on the stems and petioles of various legumes.  The invasive plant thug, kudzu, is a favorite target, but so are agricultural legumes such as soybeans, edamame, and pigeon peas. You will also find the kudzu beetle lounging on other non-target plants, which can be confusing.

It’s hard to say exactly why the kudzu beetles have vanished in your area.  But, there is a possible explanation. There is a parasitic wasp, Paratelenomus saccharalis, which is very effective at controlling the kuzdu beetle. An Asian species, like the kudzu beetle itself, this wasp has evolved with the beetle and is an effective predator of the nuisance insect.

Researchers have studied the potential of Paratelenomus saccharalis as a biocontrol. In 2012, researchers applied to the USDA for release of this wasp as a biocontrol for the kudzu beetle.  I have not seen any confirmation of the official release. That doesn’t preclude their presence, though!

According to Jennifer Miller at the University of Georgia, it appears that a number of these predatory wasps escaped during the research process and have been found in several states. Perhaps your landscape is one of the lucky recipients.

Some other beneficial insects, such as tachinid flies, also prey on kudzu beetles among other landscape pests.

There is also fungal pathogen that helps control kudzu beetles, called Beauveria bassiana.  This fungus occurs naturally in soils in much of the U.S. and has also been introduced commercially as a pesticide. Here is some information on the fungus: http://www.bioone.org/doi/abs/10.18474/JES16-26.1

To increase your success in controlling pest insects, make sure to plant a substantial number of plants they favor. Watch my podcast and slide show with Dr. Doug Landis for more information on this topic:
https://www.ecobeneficial.com/audio/interview-dr-doug-landis-research-beneficial-insects-native-plants/

From Kim Eierman at EcoBeneficial

Photo: Kudzu Beetle
Photo credit: Tomas Maul_Flickr

More from Ask EcoBeneficial!

How do I find a “mate” for my Inkberry?

I  bought two female Ilex glabra ‘Shamrock’ (Inkberry) from a local nursery this past weekend but they don’t carry any male Inkberries.   Any suggestions? Answer: I feel your pain!  The quest to find a matched pair of native dioecious plants can be infuriating!  This says a lot about how the…

Read More

When should I cut back my perennials?

You advise leaving perennials standing until Spring.  When should I cut them back? Answer: You are absolutely right – I do recommend leaving perennials standing through winter to provide a food source for birds, a place to hide for overwintering insects, stems for praying mantid egg cases, etc.   Knowing exactly…

Read More

I’d like to start some native seeds this spring. Where can I buy some?

I’d like to start some native seeds this spring.  Where can I buy some? Answer: Native plant seeds can be hard to come by, but are an extremely economical way to plant.  Many of our native seeds need some sort of pretreatment, but many do not.  A great resource to…

Read More