UC Davis DryCard Invention Wins Competition to Reduce Food Loss in Africa

Two men in floppy canvas hats pick greens from a drying frame and place them in a plastic bag.
Jim Thompson, left, and Michael Reid, both UC Cooperative Extension specialists and co-inventors of the DryCard, work on a drying experiment with kale at the Horticulture Innovation Lab's Demonstration Center at UC Davis. (Brenda Dawson/UC Davis)

Quick Summary

  • DryCard’s color changes indicate humidity levels in dried foods and seeds
  • Moisture-sensing cards can be reused many times
  • Researchers hope to connect with entrepreneurs who will manufacture and distribute the new tool

A new, low-cost invention from the University of California, Davis, to help prevent food spoilage has been named as the top emerging technology for reducing food loss and waste across the African continent.

The tool, called the DryCard, shows farmers whether their dried food products are dry enough to store safely, reducing food losses and risks of mold and associated toxins.

In March, it beat out more than 200 entries to win the grand prize in the All-Africa Postharvest Technologies and Innovation Challenge at the first All-Africa Postharvest Congress and Exhibition in Kenya. During the challenge, DryCard and other technologies and innovations were pitched to an audience of about 600, including private investors and international organizations.

“I have never seen such strong interest in a technology like this,” said Elizabeth Mitcham, director of the UC Davis Horticulture Innovation Lab and a UC Cooperative Extension specialist in postharvest biology for the UC Davis Department of Plant Sciences.

A small card in a glass jar displays a moisture-scale bar

She noted that much of the interest in DryCard has come from organizations that also work with staple crops.

“My hope is that we will find entrepreneurs and donors to help us spread this technology, so that every farmer who dries produce has access to it,” she said.

Engineering a solution that costs pennies to make

The DryCard is the brainchild of Mitcham’s UC Davis colleagues Michael Reid and Jim Thompson, who have a history of working together in California and around the world on postharvest technologies to reduce crop losses. During a Horticulture Innovation Lab workshop in Tanzania last year, Reid tested local dried foods as a class exercise and was driven to action by the magnitude of the problem. Read more about the backstory: “Inventing a Low-Cost Solution to Reduce Moldy Foods.”

The pair’s solution is about the size of a business card, with a strip of cobalt chloride paper that changes color based on humidity, a color index and directions. With a DryCard and an airtight container, farmers can easily test a sample of their product for dryness in 20 to 30 minutes.

“The DryCard requires zero calibration and can be reused many times for any kind of food you want to keep free of mold,” Thompson said. “Everything is on the card. The cobalt chloride strip is attached so it’s easy to keep track of, and the color guide is right there.”

Helps farmers reduce molds, toxins in food storage

So far, the Horticulture Innovation Lab has offered samples of the DryCard in multiple languages to researchers who can try the tool out in real-world situations.

Bertha Mjawa is one of the first researchers to test and promote the DryCard in Africa, during her work with the Market Infrastructure, Value Addition and Rural Finance Program of the Tanzania Prime Minister’s Office.

“The DryCard makes a promising solution for African farmers due to its cost effectiveness, clear indicators and ease of use,” Mjawa said. “Both farmers and agricultural experts can benefit from this technology.”

DryCard team hoping to spread the innovation

The recent All-Africa top innovation award was accompanied by a $5,000 prize for promoting and scaling out the DryCard. The research team hopes to connect with entrepreneurs who are interested in manufacturing and selling the cards.

The researchers estimate that approximately $70,000 could help the DryCard spread among seven African countries. Read more about the first All-Africa Post Harvest Congress.

More about the Horticulture Innovation Lab

The Horticulture Innovation Lab builds international partnerships for fruit and vegetable research that improves livelihoods in developing countries in Africa, Asia and Central America. The research program is led by UC Davis with funding from the U.S. Agency for International Development, as part of the U.S. government’s global hunger and food security initiative called Feed the Future. Including the Horticulture Innovation Lab, UC Davis leads five Feed the Future innovation labs focused on improving agriculture to reduce poverty — more than any other university.

Media Resources

Brenda Dawson, UC Davis Horticulture Innovation Lab, 530-752-7992, bldawson@ucdavis.edu

Pat Bailey, UC Davis News and Media Relations, 530-219-9640, pjbailey@ucdavis.edu

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