Bagworms are back in Oklahoma: Here's how to get rid of them for good

Summer in Oklahoma means keeping up on outdoor maintenance, which can mean mitigating some unwelcome visitors.

There are several species of bagworms, but the common species Thyridopteryx ephemeraeformis is the most widespread. Luckily, there are a variety of options for treatment.

How do I know if I have bagworms?

Large sack-like gatherings that look like they are spun from spiderweb or silk are a sure sign that a bagworm or webworm is in your area. Before this stage, you may see the chrysalis-like cocoons with stray leaf material stuck to the outside.

Bagworms are set up in deciduous and evergreen trees, so it is worth checking both.

How do you get rid of bagworms?

Laura Payne from Oklahoma State University recommends handpicking the sacks and dropping them into a bucket of soapy water. It is good to be thorough because any eggs leftover will overwinter.

The University of Maryland recommends not leaving the sacks away on the ground near the trees, as reinfection is more likely this way.

Chemical insecticides can be effective, but Michigan State University encourages gardeners not to use these pesticides except when absolutely necessary. Payne had another answer: Bt.

Bacillus thuringiensis is a genetically modified bacteria used to kill bagworms, according to a paper published in Bioengineered Bugs. The process works via a spray of the bacterial spores onto the infested plants. The bacteria releases a toxin upon ingestion that kills the insect. Luckily, this option is not harmful to butterflies or bees.

The earlier in the season you can control the problem, the less of a chance it will have to spread.

What are the effects of bagworms on the host tree?

Bagworms are destructive forces of nature. These insects are quick and effective defoliators that will leave trees and shrubs with a burned-looking aftereffect. Evergreens can be seriously and permanently damaged.

If the infestation goes too far, the host tree or shrub can even be killed.

What happens if my dog eats bagworms?

Bagworms themselves are not harmful to humans or dogs to touch. However, pesticides used to treat the issue can cause sickness if ingested, and sometimes the chemicals take time to work.