Bunches back on a Panama-disease field on a Red River islet: what does Japanese procurement look at?

Lien Chau commune, Phu Tho Province, northern Vietnam. The bananas lined along the riverbanks of the Red River cannot stand on their own because the bunches are too heavy, and are supported by tying tree to tree with cord. This is an area where in 2021 Panama disease (banana Fusarium wilt) outbreaks concentrated and farmers went one after another to scrapping their plots. On July 26, 2026, an agriculture and environment paper reported that a 1-ha demonstration plot placed there was maintained even after the research project ended and is in a state where symptoms hardly appear. Japan's banana imports were about 1.06 million tonnes in 2025, of which Philippine production was 788,410 tonnes, about 74% (Ministry of Finance trade statistics). For sourcing managers who do not want to concentrate the supply source in one country, whether a northern Vietnamese production area can rebuild from disease becomes a prerequisite placed before price negotiation.

The 1-ha demonstration plot where "tie it or it falls" bunches returned

According to Dr. Le Xuan Vi of the Plant Protection Research Institute, in 2021 Vinh Phuc Province commissioned the institute with a research project on banana Fusarium wilt, and the then Hong Chau commune (now Lien Chau commune) was one of the districts where the outbreak concentrated. The research team designed a combination of techniques by matching existing overseas research with its own results, and placed a demonstration plot on 1 ha of Dang Tam Dung's field.

The reason Dung was chosen is clearly written in the article. Because he was progressive, eager to learn, and promised to carry out the technical procedures exactly as instructed. The demonstration's performance is not only the performance of the procedure itself but also the result of choosing an operator who follows the procedure through. The research project ended in 2023, but the field has since been maintained by the farmer's own operation, and Panama disease hardly appears.

TR1 and TR4: what has been confirmed in Red River basin fields

The pathogen is the Fusarium fungus Fusarium oxysporum f.sp. cubense (Foc), and in Vietnam two strains, TR1 and TR4, have been confirmed. TR1 mainly attacks chuoi tay (ABB-group bananas), and TR4 attacks both chuoi tay and chuoi tieu (Cavendish group). Spores survive long in the soil and in diseased residue and invade through wounds in the roots. The main transmission routes are diseased seedlings and contaminated soil stuck to farm tools, transport vehicles, animals, and people, while water and wind are limited to short-term scattering, the original explains. Strain identification is said to have been reported by China's Si-Jun Zheng and others in 2018 and Vietnam's Tran Ngoc Hung and others in 2020.

The spread in the Red River basin also has figures in a peer-reviewed paper. A survey by Nguyen and others in the September 2025 issue of the Journal of Fungi went around 130 sites in 9 provinces from November 2022 to January 2023 (some fields were additionally surveyed in October 2023) and confirmed Fusarium wilt at 96 sites. The breakdown is Race 1/2 only at 53 sites, TR4 only at 34 sites, and both detected at 9 sites, so TR4 reaches 43 sites in total. The same survey also records that 71% of fields where disease was confirmed use suckers (offshoots) as planting material, with tissue-culture seedlings at only 10%. As long as contaminated seedlings are the biggest carrier, it makes sense that the recovery procedure replaces the seedlings first of all. It also overlaps with the question of how many labs that can stably supply disease-free seedlings grow domestically (Replacing Taiwan-dependent orchid seedlings: a Ho Chi Minh City lab's 200,000 a year）。

Working back from 180,000 dong per bunch: this field's sales scale

The amounts that appear in the original are few. It is only written that, as Dung's motive for reaching into bananas in 2016, he saw 80 plants planted on 1 sao (360 square meters) and one bunch selling for 180,000-200,000 dong. Converted at 1 yen = 162 dong, one bunch is roughly 1,110-1,230 yen. This unit price is what was seen and heard as of 2016, and the current trading price is not disclosed.

Density can be checked against two sets of figures. The demonstration plot's 2 m x 2.5 m is 5 square meters per plant, or 2,000 plants/ha; the 80 plants per sao seen in this region converts to 2,222 plants/ha, and the two roughly match. Assuming 2,000 plants each put out one bunch and mechanically applying the 2016 unit price, a rough sales guide is 360-400 million dong, about 2.22-2.47 million yen/ha in Japanese currency. This is sales, not profit. Seedlings, lime, organic matter, microbial materials, and labor all have no amounts given in the original, and a balance sheet cannot be assembled.

As a comparison, Vietnam's bananas overall had a 2024 cultivation area of 161,000 ha and exports of about US$380 million (about 61.9 billion yen at 163 yen per dollar), making it the world's ninth-largest exporter. The same source notes "average income per ha is about US$2,400," but dividing exports by area gives about US$2,360, nearly matching. This US$2,400 is not the farmer's take but the value of exports divided by the total cultivation area is the natural reading, and is also the flip side of domestic-bound shipments occupying most of the area.

The institute says "neutral to alkaline," the farmer says "pH 4.5-6"

The manual and the site's account diverge on soil pH. The institute's procedure specifies choosing high, well-drained land, pH neutral to alkaline, exposing the soil to the sun from June to December, and stirring frequently in the dry season. Lime goes in at land preparation or into the planting hole 3-5 days before planting. Seedlings use tissue-culture disease-free seedlings and the Panama-disease-resistant chuoi tieu seedlings the Fruit and Vegetable Research Institute holds, and 1-2 days before planting, a microbial material containing the genus Trichoderma and the actinomycete Streptomyces is drenched in, with 1 kg of material dissolved in 20 L of water. The same material is also applied 3 months and 6 months after planting.

Dung, on the other hand, cites as his own key points, in addition to using disease-free seedlings, keeping the pH with lime and silicate materials and maintaining the orchard's pH at 4.5-6. It can be read as an operation that swings to the neutral-to-alkaline side at land preparation and runs on the acidic side during the growing period, but the original does not explain this difference. It is a point worth confirming if you visit the production area. Examples where, depending on whether you can build a procedure to measure and correct the soil's chemistry, the balance sheet of the same area changes, are also reported for other crops (Why An Giang's rice farming on acid soil turned a profit after giving up reliance on experience）。

Dung's cultivation view shows strongly in how he handles seedlings. "Bananas, once planted, can be harvested for 3 years, and then it's replanting. Until the mother plant bears a bunch, cut all the offshoots to avoid nutrient competition, and once the mother plant bears a bunch, leave just one offshoot. The next year's harvest comes in the same month as the one left." After harvest, cut the mother plant leaving about 1 m from the base, let it nourish the offshoot, then remove the mother plant's corm. "I used to cut the mother plant's stem entirely after harvest, but then the offshoot couldn't lean on the mother plant and grew thin and slow." It is an operation that cycles suckers within a plot started with disease-free seedlings, and there is significance in the point that no seedlings are brought in from outside.

The Journal of Fungi survey team recommends incorporating chuoi tay and chuoi ngo (AA group) into a mixed-planting system and advancing the introduction and verification of the partially resistant Formosana (GCTCV-218). It is a way of thinking that does not concentrate on a single variety, and aligns in direction with Lien Chau commune's composition of holding both chuoi tay and chuoi tieu.

How does the sourcing side read a field that holds only a domestic production-area code

From a sourcing perspective, what works first is not the disease story but a one-line fact. What Dung's field holds is only a domestic production-area code, with no mention of an export code. Although he voluntarily applies safe-production standards, the premise that bananas go directly from this field to Japan does not hold at present. The demonstration plot's value lies not in "a production area you can buy from right now" but in the single point that a procedure to restore the area lost to disease actually exists in the north.

If you view it as a candidate for production-area development, there is a sequence of checks. The seedlings' source (tissue culture or suckers; if suckers, the parent block's history), whether they actually keep the one-year wait after digging out diseased plants, and whether the disinfection of farm tools and vehicles does not break between blocks. In Vietnam, the move to subdivide production-area codes down to the farmer unit is leading in fruit (The standardization of Dong Thap fruit, with region codes brought down to the "farmer level"), and the finer the granularity, the easier the history of individual fields is to trace.

The constraint of a microbial material that is not on the market

As for whether other farmers can imitate this procedure as is, the original writes the brake alongside too. The microbial material containing Trichoderma and actinomycetes was developed by the Plant Protection Research Institute's biological-control center, and it is a trial-stage product, neither registered nor circulated on the market is clearly stated. As long as the core component of recovery is not in circulation, a distance remains between the 1-ha success and areal diffusion.

Turned around, that distance becomes the place where the business opportunity sits. That companies such as Unifarm set out to standardize the process and raise it to US$20,000 per ha (about 3.26 million yen), widening the industry to a US$4 billion scale (about 652 billion yen), means there is that much room for standardization left. Registration and mass production of microbial materials, supply of disease-free seedlings, and education in field hygiene are all areas where Japanese materials makers and trading companies can get involved. In Japan's import statistics, Vietnamese production is still at a scale buried in the Ministry of Finance trade statistics' "other" (120,224.8 tonnes in 2025), but the Nihon Keizai Shimbun reported that the 2024 import volume was about 14 times that of 2019.

Lien Chau commune's production-area data and contact routes

Summary

What happened on the Red River's sandbar is not the injection of dramatic new technology. It was only that the plain procedures of disease-free seedlings, lime and organic matter, microbial material, immediate digging out of diseased plants, and a one-year wait were continued on his own even after the project ended. Even so, in a place where plot scrapping came one after another, trees that fall under the weight of their bunches have returned.

The Japanese side's next move is concrete. To evaluate a northern production area, have them provide the seedlings' source and the diseased-plant disposal records before asking about yield or unit price. If you premise export, ask the local plant-quarantine authority about the process and period for a field that holds only a domestic code to obtain an export code. If you get involved on the materials side, bring in how far the function the unregistered trial material carries can be replaced with a registered alternative. Dung's field can be used not so much as a counterparty to buy from now as a yardstick for measuring the resilience of northern production areas.

References: Nong nghiep va Moi truong／Journal of Fungi 2025;11(9):653／Central Fruit Association, Overseas Fruit-Tree Agriculture Information No. 159-160／Banana statistics (Ministry of Finance trade statistics)／Nihon Keizai Shimbun／Dan Viet