> ## Content Index > Fetch the complete content index at: https://www.organicfoodtogether.nz/llms.txt > Use this file to discover other available public pages before exploring further. # Are Organic Bananas Fumigated? - URL: https://www.organicfoodtogether.nz/are-organic-bananas-fumigated/ - Published: 2026-09-11T18:31:31.000Z - Updated: 2026-09-13T08:24:47.000Z - Description: A sign in an organic shop said imported fruit is often fumigated. I went and read the rules. Bananas have their own line in the treatment schedule, and the chemical is hydrogen cyanide. How often it is used, nobody will say. - Author: Luke Nicholas - Tags: Bananas, Biosecurity, Imported Produce, organic certification, MPI *Bananas are the most bought item in New Zealand supermarkets. I went looking for what happens to them at the border.* I buy organic bananas. I had assumed the word organic covered the whole journey, from the farm in Ecuador to the bowl on my bench. Then I saw a sign in an organic shop. Imported fruit, it said, is often fumigated. Often. Not always, not never. That is the most anyone selling fruit in this country has ever told me about it, and it was on a card on a shelf rather than on the fruit. So I went and read what the rules actually say. ## What the border actually requires New Zealand has an import health standard for fresh bananas and plantains. The thing it is most worried about is fruit fly, and the way it manages that risk is not what I expected. Bananas have to be exported at what the standard calls the mature hard green stage. A green banana is not a host for fruit fly. That is the control. The declarations that accompany shipments from Ecuador, the Philippines, Mexico, Panama, Samoa, Tonga, Niue and Fiji all accept an older wording: shipped in an unripe condition. Two other pests get a mention, citrus blackfly and hibiscus mealybug. For those, treatment is one option among six. Coming from a pest free area counts. In-field pest control counts. A combination of measures counts. Nowhere does the standard say every banana gets gassed on arrival. So it is not automatic. Nothing in the standard turns up the fruit fly risk into a fumigation requirement. Whatever often means, it is not written down here. Then I found the other document. ## Three grams per cubic metre Biosecurity New Zealand publishes a schedule called Approved Biosecurity Treatments. It is 64 pages of what may be done to what, and with which chemical, when something turns up that should not be here. The current version took effect in July 2026. Bananas have their own line. The reason for treatment is surface insects. The treatment code is FVT6\. The chemical is HCN. HCN is hydrogen cyanide. The schedule sets it at 3 grams per cubic metre, which it also gives as 2620 parts per million, for two hours, at 13.5 degrees or above. The fans have to run at a metre per second throughout. Plastic carton liners have to be perforated or taken out. The load can only fill half the chamber. The fruit has to be dry, because moisture soaks up the gas. The room has to have painted walls. There is a footnote about using discoids instead of bottled gas, in which case you add thirty minutes to let the cyanide form. Almost everything else in that section of the schedule is methyl bromide. Bananas are one of the few commodities with a chemical of their own. ## The treatment for an Ecuadorean banana is picking it green I went back to the operative standard, the one in force since March this year, and found the country schedule for Ecuador. Bananas from Ecuador have to satisfy two things. Inspection, and treatment in accordance with Appendix 2 of the arrangement between MPI and Ecuador's agriculture ministry. Appendix 2 is listed in the same document. It reads: Non-host Status. Non-host status based on maturity. Banana and plantain. That is the treatment. The whole thing. The historic wording the standard still accepts on the certificate is "shipped in an unripe condition." Ecuador has exactly one other appendix, number 3, a hot water dip for mangoes. There is no fumigation appendix for Ecuador at all. And when MPI does mean fumigation, it says so plainly. Garlic from China, in the same document, carries the line that mandatory fumigation is required prior to inspection, with methyl bromide, at four listed dose and temperature combinations. Nothing remotely like that appears anywhere near bananas. ## So why is a green banana safe Because fruit fly, the pest that drives most fumigation, lays its eggs in ripening fruit and its larvae need soft flesh. A hard green banana cannot support that. It is not a host. That is what non-host status means, and it is a real control rather than a loophole. The neat part is that bananas are picked green anyway. They have to be, or they would arrive as mush after three or four weeks at sea. So New Zealand gets its biosecurity for free, and nobody has to build a fumigation chamber big enough for eighty thousand tonnes a year. Fumigating them would be the strange choice. It costs money, it means perforating or pulling out every plastic carton liner, and it damages fruit that is already in exactly the condition the rules require. ## The gas room everybody half-remembers Here is where I think the confusion comes from. Every imported banana does go into a sealed room and get gassed. Just not with cyanide. Green bananas are shipped cold to stop them ripening, then loaded into airtight chambers near the market and dosed with ethylene, the same hormone the fruit makes itself. In New Zealand the standard mix is 4 percent ethylene in nitrogen, diluted because pure ethylene is an explosion risk. A post-harvest specialist at the University of Costa Rica, asked what proportion of supermarket bananas have been ethylene-treated, said 100 percent. That includes the organic ones, and ripening organic tropical fruit with ethylene is explicitly permitted under organic rules. I found a New Zealand food blog describing a visit to a banana ripening facility. It says the bananas are fumigated on arrival to kill any bugs that hitched a ride, and then go into the rooms to ripen. One paragraph, two different things, run together. So the picture, as best I can establish it: Bananas are picked green because that is the only way they survive the trip. Being green is also, conveniently, the legal biosecurity measure, because a hard green banana cannot host fruit fly. They arrive, get inspected, and go into a sealed room where they are gassed with ethylene to ripen. If an inspector finds a surface insect, that consignment can be directed for hydrogen cyanide treatment, but nothing in the schedule makes that routine. One gas room, universal and benign. One fumigant, occasional and conditional. They happen in similar-looking facilities and both get called gassing. That is not a scandal. It is a muddle, and the muddle has been repeated up the chain until the company importing the fruit is telling its customers the law requires something the law does not require. ## What that leaves behind I could not find residue data for hydrogen cyanide on bananas. Not from our regulator, not from anyone else's. What exists is citrus data, from the United States, where sodium cyanide is used as a source of the same gas for post-harvest fumigation of fruit going into Arizona. It is not bananas. Different fruit, different skin, different dose. But it is the closest thing there is, and it says something that surprised me. Hydrogen cyanide is often described as leaving no residue. On dry things like timber and grain, that holds up. The gas goes in and comes back out. Fresh fruit does not behave that way. In the American work, citrus absorbed between 70 and 95 percent of the available gas within one hour. When the chamber was aired out, less than 5 percent came back off. After 48 hours, most of what had been absorbed was described as irreversibly bound. There was no evidence it broke down. Where it ends up matters. Orange peel averaged 1.2 parts per million eight hours after fumigation, dropping to 0.45 at 48 hours. Orange pulp averaged 0.06 parts per million at eight hours and under 0.01 at 48 hours. Twenty times more in the skin than in the flesh. And you do not eat banana skin. The American tolerance for cyanide residue on citrus is 50 parts per million. The highest amount anyone actually measured was 24\. Neither Codex nor Canada has set a limit at all. ## The part where I expected to find something worse I went looking for the accumulation story. Small doses, over years, building up. It is the shape a lot of food safety writing takes, and I half expected to find it. It is not there. The American toxicology profile for cyanide is direct about it. Cyanide has not been shown to build up in blood or tissue after long term oral exposure. Rats fed it daily for two years had virtually none in their plasma or kidneys. The body converts about 80 percent of it to thiocyanate and passes it out in urine. The half life in human plasma is somewhere between twenty minutes and an hour. Through the skin, it is slower than through the lungs or the gut. Laboratory work on human skin samples found minimal penetration of the vapour. There is real chronic harm from dietary cyanide. It shows up in populations eating cassava as their staple carbohydrate, where it causes thyroid damage and a paralysing neurological disease called konzo. Those are exposures on a completely different scale to a fumigated banana. For context, smoking is one of the larger sources of cyanide exposure most people have. Small amounts are present in normal human blood. Vitamin B12, in one of its common forms, contains cyanide. So this is not a story about a poison in your fruit. I want to be clear about that, because it would be easy to write it that way and it would be wrong. ## It is a story about not being told Organic certification governs how the fruit is grown. It says nothing about what happens between the ship and the shelf, because at the border the fruit is not organic produce. It is a risk good. Biosecurity law does not have a category for the certificate. That is defensible. Keeping fruit fly out of New Zealand matters more than a label, and I would rather they gassed a pallet than let Queensland fruit fly establish here. What is harder to defend is how little of it reaches the person buying the fruit. No pack tells you. No sticker tells you. The best information available to me, as a shopper, was a hand-written word on a shelf card in an organic shop, and that word was often. I do not think the shop is wrong. I think they are the only people in the chain who said anything at all, and they said the honest thing, which is that it happens and you cannot know when. Every step is documented. Treatment gets recorded on the phytosanitary certificate. The dose and duration go on the paperwork. The system knows. It just stops at the wholesaler. ## Who brings in the organic ones The organic Fairtrade bananas in most New Zealand health food stores come from All Good. It is a New Zealand company, owned by the people who founded it, with a slice held by members of the public who bought shares through a crowdfunding offer. No offshore parent, no private equity. If you were going to trust anyone in this chain to tell you what happened to the fruit, it would be them. And they do tell you. It is on their FAQ page, under the question of whether their bananas are organic. They sell an Organic Fairtrade range grown to full organic standards. Then they add what they call a quirk. Their certified organic fruit loses its official organic status on arrival, because New Zealand law requires imported fruit to be fumigated at the border. Nothing changes on the farm. Which is why, they say, you will see them use the words organically grown rather than organic. Go and look at a bunch. That is what it says. So there is no such thing as a certified organic imported banana in this country. The fruit is grown to the standard. It just does not arrive with the certificate intact. I want to be careful here, because their explanation and the standard do not line up. The standard says the treatment for an Ecuadorean banana is picking it green. Their FAQ says the law requires imported fruit to be fumigated at the border. I cannot make those two meet. And I do not think they are being sly about it. They are the only company in the chain that has bothered to explain any of this to a customer, and they have changed the words on their own packaging as a result, which is a costly thing to do for no reason. Chris Morrison has done this before. He spent about twenty years building Phoenix Organics with his wife Deborah Cairns and a business partner, and sold it to Charlie's in December 2005 for $10 million. Charlie's was bought by Asahi in 2011\. New Zealand's pioneering organic drinks brand now sits inside a Japanese brewing company. He started again with bananas in 2008, and the first fruit landed in 2010\. This time there is no trade buyer on the register. There is a block of shares owned by members of the public who bought in through a crowdfunding offer. He also spent a decade on the board of BioGro, the certifier, and currently sits on the board of Organics Aotearoa New Zealand. That is not an accusation. It is a small sector and the same names are in most of the rooms. But it does mean the person explaining why his bananas cannot be called organic has also sat on the board of the body that decides what organic means here. I sent no questions to anyone for this. Everything here came off public documents. ## Where that leaves me I went looking because of a sign on a shelf. Often fumigated. If that were true, then the organically grown bananas next to it could not be called organic, which is exactly what the importer's website says, and it blames the law. The law, as far as I can read it, says nothing of the sort. Ecuadorean bananas satisfy their treatment requirement by being green when they leave. So one of three things is happening, and I cannot tell you which. The shelf card and the FAQ might be describing the ethylene room, which every banana goes through and which harms nothing. They might be describing real interceptions, consignments that genuinely were directed for treatment, generalised into a rule. Or it might simply be a story that has been passed along the trade for long enough that everyone repeats it. What I can tell you is that I read the import health standard, the treatment schedule, the country appendix and the company's own explanation, and I still cannot answer the question I started with. A person standing in a shop holding a bunch of bananas has no chance at all. That is the actual finding. Not a chemical. A gap where the answer should be. The banana is still the most bought thing in the supermarket. It travels nine thousand kilometres and lands in a bowl, and the most anyone will tell you about what happened along the way is a word on a shelf card. Often. --- **Before you go** If you want more like this, [sign up here](SIGNUP-URL). It is free. If you want to chip in, [you can do that here](TIP-URL). One off, no subscription.