The Royal Society for the Protection of Birds (RSPB) has called on gardeners to alter long-established habits by following a new "one-to-two-day" rule when leaving food out for birds. This updated guidance aims to tackle the spread of a deadly avian illness, particularly the trichomonosis parasite.
Trichomonosis Threatens Bird Populations
In April, the RSPB shared revised advice as part of a push to curb disease transmission in gardens. Trichomonosis, caused by a parasite targeting the upper digestive tract and throat, leads to lesions that prevent birds from swallowing, often causing starvation. Finches are especially vulnerable, and the disease has devastated Greenfinch and Chaffinch populations, with a rapid decline also observed among Bullfinches.
Seasonal Feeding Adjustments
The RSPB's Feed Seasonally, Feed Safely guidance recommends limiting food left out between May 1 and October 31. During peak outbreak periods in summer and autumn, households should offer only small amounts of suet, fat balls, and mealworms. Ceasing to provide seeds and peanuts, which finches favor, encourages birds to seek natural food sources and reduces outbreak risks.
Hygiene and Moderation
The RSPB emphasizes keeping feeders clean and moving them regularly to prevent debris buildup that may carry disease. Feeders should not be placed under trees or where birds roost, as infected birds may defecate on feed. The organization also calls for feeding in moderation, citing evidence that supplementary feeding promotes disease spread. Households should ensure all food is eaten within one to two days and adjust amounts based on demand to avoid overfeeding.
Full guidance is available on the RSPB's website.
