Shedding Light on Moths in the Edible Garden

By Kelly Vowels

Herpetogramma thestealis, Dane DeWitt

Recently, Bernheim staff and volunteers conducted a moth survey in the Edible Garden using artificial lights on white sheets to attract the moths. Moths are known to be drawn to lights, though the exact reason is not fully understood. While some scientists once thought moths were attracted to heat or mistook artificial light for the moon, the most accepted theory is that moths use light as a navigational cue. When encountering artificial lights, they become disoriented and fly in circles around the source. This disorientation can be detrimental to moths and other wildlife, impacting their reproduction and larval development, and has contributed to the decline of many species. To support moths and other nocturnal critters, consider turning off unnecessary outdoor lights.

Pyrrharctia isabella, Kelly Vowels

During the survey, fourteen moth species were identified, including four that had never been recorded in Bernheim Forest. These species represented seven different families. Notable finds included the Isabella tiger moth (Pyrrharctia isabella), which is often associated with weather predictions based on the color of its caterpillar, and the waterlily borer (Elophila gyralis), whose larvae feed on waterlily petioles. The most striking moth observed was the harnessed tiger moth (Apantesis phalerata). Additionally, six leafhopper species were recorded, including two that are new to Bernheim’s records.

Acrolophus popeanella, Kelly Vowels

Our team plans to continue our moth surveys to learn more about the species within our borders. You can also observe moths in your own backyard by checking around outdoor lights— just remember to turn off lights that are not needed. The moths will appreciate it!

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