Disease-resistant crop varieties (marker-assisted breeding, stacked resistance genes, cisgenesis) instead of routine fungicide spray programmes

Replaces: routine protective fungicide programmes · Scope: potato, grapevine, cereals, vegetables · Evidence: high

The chemical problem#

• Susceptible varieties of potato and grapevine are the most fungicide-intensive crops in temperate agriculture: 10–20 late-blight sprays per season in wet potato regions, 8–15 sprays in European vineyards.
• The key protectant chemistry is disappearing: mancozeb (EU non-renewal 2021) and chlorothalonil (EU non-renewal 2019) are gone from the EU market; copper is capped at 28 kg/ha over 7 years in the EU.
• Each spray adds fuel, soil compaction and residue risk, and single-site fungicides lose efficacy to resistance.

Product overview#

1. Marker-assisted selection (MAS) — DNA markers linked to resistance genes speed up classical breeding and allow stacking of several genes in one variety.
2. Resistant grape varieties (PIWI) — crosses with American/Asian Vitis carrying Rpv (downy mildew) and Run/Ren (powdery mildew) genes, back-crossed to wine quality.
3. Cisgenic and gene-edited resistance — inserting resistance genes from wild relatives of the same species (e.g. potato Rpi genes from wild Solanum), or editing susceptibility genes (e.g. mlo for powdery mildew).
4. Variety mixtures and multilines — see A14.

Active ingredient / Composition#

• The “active ingredient” is a gene: e.g. potato Rpi-blb1, Rpi-blb2, Rpi-vnt1; grape Rpv3, Rpv10, Rpv12, Run1, Ren3; wheat Sr/Lr/Yr rust genes; barley mlo.
• Delivered as certified seed, seed tubers or grafted vines.

Key facts#

Advantages#

• Protection is built into the seed: no spraying equipment, no residue, no operator exposure.
• Lowest cost per hectare of any disease control once the variety exists.
• Works in organic farming (conventional and MAS varieties).
• Stacked genes plus a few targeted sprays protect the resistance itself.

Mode of action#

• Resistance (R) genes encode immune receptors that recognize pathogen effectors and trigger a hypersensitive response, stopping infection at the entry site.
• Loss-of-function in susceptibility genes (e.g. mlo) removes what the pathogen needs to infect.
• Quantitative (polygenic) resistance slows epidemics; it is usually more durable than single R genes.

Application#

Limitations#

• Single genes break down when pathogens evolve (rust, late blight); stacking, rotation of genes and residual sprays are needed.
• Market barriers: new grape varieties are not allowed in many protected-origin wines; consumers and buyers know old potato varieties.
• Gene-edited and cisgenic products face GMO rules in many markets.
• Breeding takes years; resistance must be combined with yield and quality.

Evidence of displacement — D2: measurable displacement (minority share)#

Assessment (hand-reviewed): Germany: disease-resistant grape varieties 3–3.5% of vineyard area.

Verified figures (the number is in the quoted sentence and the sentence is on the source page):

• displacement — In Germany, fungus-resistant grapevine varieties (FRGV) account for approximately 3% to 3.5% of the total viticultural acreage. (Germany, current (as of 2024); peer-reviewed: mdpi.com)
• displacement — In 2022, 9.5% of annually planted grapevines in Germany were disease-resistant varieties. (Germany, 2022; peer-reviewed: exa.ai)
• displacement — In Switzerland, the share of land under fungus-resistant varieties is approximately 3%. (Switzerland, 2023; weak: pureadmin.qub.ac.uk)
• performance — In French vineyards, the use of disease-resistant grapevine varieties has reduced phytosanitary treatments by an average of 79% compared to conventional plots. (France, 2018-2026; peer-reviewed: exa.ai)

Suppliers — real products and services (from the vendor index)#

Active vendors whose own card shows disease-resistant varieties or marker-assisted breeding services.

Update 2026-10-06: removed after the freshness refresh — no longer active: Vibha Seeds Group (insolvency proceedings).

Government funding signals#

Scanned 2026-10-01 (OpenAIRE + NSF); candidates reviewed by hand.

Signal: Strong. 46 candidates on late-blight resistance alone, e.g. UKRI-BBSRC BB/W017903/1 (combining late-blight and virus resistance with tuber quality, £413 k, 2022), BB/L026880/1 (UK–China durable late-blight resistance) and several Czech Ministry of Agriculture (MZE) breeding projects for horizontal late-blight resistance.

Scientific evidence#

• Haverkort AJ, Boonekamp PM, Hutten R, et al. (2016). Durable late blight resistance in potato through dynamic varieties obtained by cisgenesis: scientific and societal advances in the DuRPh project. Potato Research 59: 35–66.
• Jones JDG, Witek K, Verweij W, et al. (2014). Elevating crop disease resistance with cloned genes. Philosophical Transactions of the Royal Society B 369: 20130087.
• Brown JKM (2015). Durable resistance of crops to disease: a Darwinian perspective. Annual Review of Phytopathology 53: 513–539.
• Pertot I, Caffi T, Rossi V, et al. (2017). A critical review of plant protection tools for reducing pesticide use on grapevine and new perspectives for the implementation of IPM in viticulture. Crop Protection 97: 70–84.

Bioeconomy value#

A resistance gene is a fungicide programme the farmer buys once, inside the seed. As protectant fungicides leave the market, resistant genetics become the main replacement, and the seed companies in this index are the sales channel.