The Royal Society for the Protection of Birds is asking households across the UK to take down their garden bird feeders from 1 May through 31 October, a six-month pause designed to slow the spread of a parasitic disease that has devastated two of Britain’s most familiar songbirds.
The guidance, published by the RSPB in April 2026 and covered in Guardian environment reporting, targets trichomonosis, an infection caused by the parasite Trichomonas gallinae. Since the disease first emerged in British finch populations, greenfinch and chaffinch numbers have fallen sharply, according to long-term monitoring data.
Why feeders are part of the problem
Trichomonosis spreads through contaminated saliva and regurgitated food. Garden feeders, where dozens of birds share the same perches and seed ports throughout the day, create exactly the conditions the parasite needs to jump between hosts. Infected birds develop lesions in the throat and crop that make swallowing difficult; many starve within days.
Research published in Philosophical Transactions of the Royal Society B traced the emergence and geographic spread of finch trichomonosis across the British Isles, drawing on post-mortem examinations and national surveillance data to link feeder-associated congregation with epidemic mortality. A later study in Scientific Reports reinforced that finding, showing that population declines were sharpest in peri-domestic garden habitats rather than in open countryside, where birds feed more widely and contact between individuals is less intense.
That habitat contrast is central to the RSPB’s reasoning. In rural settings, finches forage across hedgerows, field margins, and woodland edges, rarely concentrating at a single point. In suburban and urban gardens, a well-stocked feeder can draw birds back to the same spot repeatedly, turning a generous gesture into a transmission hub.
What the RSPB is recommending
An RSPB spokesperson said: “We know people love feeding their garden birds, but during the warmer months the risk of spreading trichomonosis at feeders outweighs the benefit. Taking feeders down from May to October is one of the simplest things households can do to help greenfinches and chaffinches survive.”
The charity’s advice is straightforward: remove feeders by 1 May and leave them down until the end of October. During those warmer months, parent birds naturally shift to protein-rich food sources, particularly insects and caterpillars, to feed their nestlings. The nutritional case for supplementary feeding weakens just as the disease risk peaks, making the trade-off relatively clear.
For gardeners who want to keep supporting wildlife through the summer, the RSPB suggests several alternatives that avoid concentrating birds at a single point:
- Plant native shrubs and wildflowers that provide berries, seeds, and insect habitat.
- Leave patches of lawn unmown to encourage invertebrates.
- Provide a shallow dish of clean water for drinking and bathing, scrubbed and refilled daily.
When feeders go back up in November, the charity recommends cleaning them thoroughly with a mild disinfectant solution, rotating feeding sites around the garden, and watching for birds that appear lethargic or have difficulty swallowing, both potential signs of trichomonosis.
What we still don’t know
The scientific case linking feeders to disease transmission is strong, but several questions remain open. No controlled field trial has isolated feeder removal as a variable and measured its direct effect on nestling survival or local disease prevalence during a single breeding season. The RSPB’s recommendation rests on epidemiological logic rather than experimental proof: fewer shared surfaces should mean less parasite transmission, which should mean fewer sick adults and chicks.
Compliance is another unknown. The RSPB has issued similar seasonal guidance in previous years, yet no published study tracks how many households actually take feeders down or whether local removal correlates with reduced disease in nearby bird populations. If only a small fraction of feeders come down, the population-level benefit may be limited even if the underlying science is sound.
There is also a gap in recent population data. The most detailed peer-reviewed analysis of greenfinch and chaffinch declines dates to 2022. Annual monitoring continues to show greenfinch numbers falling, but a comprehensive updated assessment that accounts for the latest breeding seasons has not yet been published. Ongoing disease surveillance typically reports findings with a lag.
How well birds in heavily built-up areas can compensate when feeders disappear is another area that needs more research. Natural food is generally abundant in summer across most of the UK, but the picture may differ in dense urban neighbourhoods where green space is limited and insect populations are lower.
The bigger picture
Garden bird feeding is deeply embedded in British culture. Asking people to step back from that habit for half the year is a significant shift, and the RSPB’s willingness to make the request reflects how seriously the charity views the trichomonosis crisis.
For anyone who has watched greenfinches gradually vanish from a garden that once hosted them daily, the advice carries a particular weight. The species was a fixture of British feeders for decades, its olive-and-yellow plumage easy to spot among house sparrows and blue tits. Its decline has been one of the starkest examples of how wildlife disease can reshape the everyday natural world that people see from their kitchen windows.
The RSPB’s recommendation is, at its core, a precautionary step: a way for the millions of people who enjoy feeding garden birds to reduce the chance that their generosity is making a bad situation worse. Whether it works at scale depends on how many households act on it, and on research that has yet to be done. But the logic is clear, the science behind it is peer-reviewed, and the cost of trying is low. Taking a feeder down for six months is a small inconvenience measured against the possibility of helping a struggling species hold on.
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*This article was researched with the help of AI, with human editors creating the final content.
