The World's Love for Larvae: A Green Revolution in Agriculture
In the bustling streets of Nairobi, Kenya, where children play football on dusty lots beside apartment blocks, an unassuming concrete building stands behind a wobbly corrugated iron fence. It's a place that might not immediately suggest an agricultural revolution, but it's here that an innovative solution to food waste management is taking shape.
Meet Winnie Wambui, a 24-year-old engineering student and entrepreneur. She's raising black soldier flies, a species known as Hermetia illucens, which are transforming the way we think about waste. These flies are not your typical pests; they're a key player in a green revolution.
Wambui's business feeds food waste from local markets to the fly larvae, which can consume double their body weight in a single day. This process offers a low-cost waste management solution with multiple benefits. The larvae's excrement, known as frass, is sold as a natural fertilizer, and the larvae themselves become a high-protein meal for other farmed animals, including chickens and fish.
Wambui's partnership with the International Centre of Insect Physiology and Ecology, partly funded by an annual $500,000 grant from the Australian Centre for International Agricultural Research, has been instrumental in her success. Through this collaboration, she's received training and starter kits, and even traveled to Germany to learn more about BSF farming.
"My engineering background is now being directed to an agricultural business that creates economic and social impact," she says. "Through ICIPE, I've gained valuable knowledge and resources that have helped me turn my vision into a reality."
Black soldier flies are being hailed as a green solution to food waste, which contributes up to 10% of global greenhouse gas emissions, according to the UN. This innovative approach is not limited to Kenya; in Australia, black soldier flies are being genetically engineered to consume more human waste, and AgriFutures Australia confirms they are not considered pests.
Luke Wheat, founder and managing director of Arvela, a company breeding black soldier fly larvae for the market, predicts an exciting period of growth for the industry over the next five years. He highlights the low biosecurity risk associated with these flies, as they are non-biting, non-disease-spreading insects that appear seasonally and in low densities.
Wheat, who chairs the Insect Protein Association of Australia, emphasizes the unique position of black soldier flies in waste management. Their rapid waste digestion during the larval stage is comparable to a bear preparing for hibernation, packing on nutrient and fat stores.
The target market for dried larvae, marketed as BSF protein, is aquaculture, but live larvae can also be fed to poultry in some Australian jurisdictions. Dried larvae have been approved for use in specialty dog food, where they are advertised as a "hypoallergenic novel protein," with palatability testing showing canine satisfaction equivalent to other animal protein sources.
Furthermore, the larvae can be rendered into oil, which contains antimicrobials beneficial for gut health, especially in piglets. A $2.5 million multi-industry research project led by Australian Pork Limited in 2024 found that black soldier flies can reduce waste volumes by up to 79% and that the resulting fertilizer outperforms commercial synthetic fertilizers.
In May, AgriFutures announced a five-year, $2 million project in partnership with the University of Adelaide to determine industry best practices and address regulatory challenges, including biosecurity issues surrounding transporting larvae. Meanwhile, Wheat has begun selling larvae to customers like Goterra, which builds mobile modular black soldier fly farms for various applications.
"The units can process up to 1.7 tonnes of organic waste a day," says Goterra's founder, Olympia Yarger. "From each tonne of waste, the [larvae] produce 250kg of fertilizer and 80kg of processed insect protein."
Researchers at Southern Cross University are exploring the use of larvae in green fuel production, with a focus on the fat content of BSF larvae, which can be converted into biodiesel through chemical engineering. Additionally, chitin, a natural biopolymer produced by larvae exoskeletons, is being investigated for applications in wound-healing bandages and weed control.
"I know we’re a long way off, but the ultimate goal is to replace some of the synthetic plastics with biopolymers, and these amazing creatures can help us do that," says Dr. Lachlan Yee, the research lead.
As the world embraces this innovative approach to waste management, black soldier flies are proving to be a key player in a greener, more sustainable future.
