Tracking RNA interference in global crops
RNA technology is no longer theoretical in plant agriculture. While edible mRNA “salad vaccines” remain experimental, RNA interference (RNAi) is already part of commercial farming
Unlike injectable mRNA vaccines used in humans, RNAi works by silencing genes in pests or in the plant itself and it is already present in fields and grocery stores.
1. Sprayable RNA Biopesticides: The First Commercial Wave of RNA Technology
A major shift in crop protection is underway: from chemical poisons to RNA‑based sprays. Industry sometimes calls these “plant vaccines,” but they work by killing pests through gene silencing, not by immunizing the plant.
United States — Potatoes 🥔(Calantha / Ledprona)
In 2024, the EPA approved Calantha, a dsRNA spray used on potatoes. When the Colorado potato beetle eats treated leaves, the RNA enters the insect and switches off a vital gene, killing it.
Export relevance:
The U.S. exports large volumes of potatoes and processed potato products to Canada, Mexico, Japan, South Korea, the Middle East, and parts of Europe. If Calantha use expands, RNAi‑treated potatoes could enter these supply chains.
China — First Country to Approve RNAi Sprays at Scale
In April 2026, China’s ICAMA approved the world’s first commercial RNAi biopesticides targeting Tobacco Mosaic Virus (TMV). These sprays can be used on:
- 🚬 Tobacco (primary target)
- 🍅 Tomatoes
- 🌶️ Peppers
- Other TMV‑susceptible crops as approvals expand
China is currently the only country deploying RNAi sprays in real agricultural production.
Export relevance:
China is a major exporter of:
- 🥫Tomato paste and processed tomato products → to Italy, Spain, Germany, Netherlands, Japan, South Korea, Middle East, Africa
- 🌶️🌶️ Pepper products (fresh, dried, powdered) → to United States, EU, Japan, South Korea, Southeast Asia, Middle East
- 🥬 Tobacco leaf → to Indonesia, Vietnam, Philippines, Egypt, UAE, Russia
As RNAi sprays expand beyond TMV‑targeted crops, these exports could include RNA‑treated produce.
Europe, South America, Asia (outside China), Australia
- No approvals for RNAi sprays
- No commercial use of RNA‑based biopesticides
- Research exists, but nothing is in fields
2. Built‑In RNAi Traits: Gene Silencing Inside the Plant
Some foods now contain RNAi traits encoded directly into their DNA. These do not target pests, they change the food itself.
- Innate Potatoes (U.S. & Canada) 🥔 — Engineered to silence genes responsible for browning and for producing acrylamide during frying.
Export relevance: North American potatoes and processed potato products are exported widely, especially to Asia and Latin America. Innate potatoes can enter these markets unless specifically restricted. - 🍎 Arctic Apples (U.S. & Canada) — Use RNAi to prevent browning after slicing.
Export relevance: Currently limited to North America, but distribution could expand to Asia. - 🌾High‑Amylose Wheat (Australia) — Uses gene silencing to increase resistant starch and fiber.
Export relevance: Australia is a major wheat exporter. High‑amylose wheat can be exported to Asia, the Middle East, and Europe for milling and baking.
These products are already in retail supply chains.
3. Edible mRNA “Plant Vaccines”
There is no approved edible mRNA vaccine in the food supply. But research is active and controversial.
- The “Salad Vaccine” Project — UC Riverside and University of Ottawa researchers are exploring how to engineer lettuce and spinach chloroplasts to produce mRNA for oral immunization.
- Current status — These remain strictly experimental. No regulator (FDA, EFSA, etc.) has approved edible mRNA vaccines due to unresolved issues around dosage, stability, and long‑term safety.
4. The Debate: Independence, Safety, and Public Trust
Most of the existing safety studies come from the same companies developing and selling RNA‑based technologies.
This creates a structural problem: there is very little independent research examining long‑term ecological or human‑health effects. Gene‑silencing tools could have off‑target impacts on non‑target insects, soil microorganisms, or potentially on consumers — and without independent data, those questions remain unanswered.
The absence of publicly funded, third‑party studies fuels a broader concern: the science is being shaped by the companies that profit from the technology, not by neutral oversight.
How to Avoid RNAi and mRNA‑Related Crop Technologies
Because RNAi crops fall under the broader GMO category, the same avoidance strategies apply.
1. Look for “Non‑GMO Project Verified”
This independent label prohibits RNAi seeds and ingredients.
2. Choose Certified Organic
Organic standards in the U.S. and EU ban genetic engineering, including RNAi sprays and engineered traits.
3. Avoid Specific High‑Risk Brands
- 🍎 Arctic Apples
- 🥔 Innate Potatoes (non‑browning, reduced acrylamide)
- 🍞 High‑Amylose Wheat products marketed as “high‑fiber white flour”
4. Check PLU Codes
- 9xxxx = Organic (no RNAi/GMO)
- 8xxxx = GMO (rarely used but may indicate RNAi traits)
- 4xxxx = Conventional (may be treated with RNAi sprays)
PLU codes are globally standardized but voluntary. Organic produce always uses the 9‑prefix, but the 8‑prefix for GMOs is almost never used in real stores, so consumers cannot rely on it to identify RNAi or GMO crops.
5. Shop at Retailers with Stricter Standards
Natural Grocers, and many co‑ops prioritize Non‑GMO Project Verified products.
6. Make Your Own Garden
One of the most reliable ways to avoid RNA‑based products in food is simply to grow part of your own produce. In Bulgaria, for example, there is a non‑GMO seed exchange festival where people trade or buy traditional seeds.
It’s an excellent way to preserve clean varieties and similar seed‑exchange networks exist in many countries.
Joining natural farming and homesteading groups on social media can also help you find clean seeds, trustworthy meat producers, and a community of people who care about real food.
A garden doesn’t require a field. Many crops grow perfectly well on a balcony, terrace, or small yard.
Beyond the practical benefits, tending a garden is grounding, reduces stress, and supports mental well‑being.
It’s one of the simplest ways to take back control of your food.
See more here substack.com
Header image: ISAAA
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