Supplemented Diet Could Make Waxworms Viable for Plastic Bioremediation

Caterpillars could play a role in breaking down plastic waste—but only if their diet includes certain supplements, according to a preprint research paper from Brandon University scientists in Canada.

The study examines waxworms, the caterpillar larvae of the greater wax moth, which can eat and digest low-density polyethylene (LDPE), one of the world’s most common plastics.  When fed only LDPE, waxworms show “decreased survival, growth, and development” compared to those eating their natural honeycomb diet.  But researchers discovered a promising combination: equal parts LDPE, honeycomb, and corn syrup.

“Notably, recovery from this diet indicates that LDPE and the associated biodegradation process does not adversely affect larval consumption or fitness,” the research paper states.  As a result, “large-scale rearing of G. mellonella on an optimized, co-supplemented diet could have intriguing potential in plastic bioremediation.”

Other experimental diets testing combinations of sugar, vitamins, protein, and food waste proved unsuccessful.

The paper was released on June 24, 2025, and has not yet been peer reviewed.

Real-World Implementation

Waxworms offer several practical advantages for plastic bioremediation.  According to the researchers, the “larvae are highly tractable in laboratories/facilities, have high reproductive capacity, require a small footprint relative to biomass, and are voracious feeders.”

In addition, while waxworms on the LDPE-supplemented diet had slower development than those an all-honeycomb diet, the paper argues that may be beneficial because “it allows for longer feeding durations and presumably more plastic consumption overall.”

However, the researchers caution against drawing overly optimistic conclusions from the study.  For example, while the experiment used pure LDPE, “all commercially prepared LDPE contain small amounts of stabilizer,” which might impact larval fitness.

Another unknown is whether residual microplastics remain after waxworms digest LDPE.

More information on the paper is available on its SSRN page.