Commercial director Peter Pritchard said: "A combination of the recent warm weather and the continuing doom and gloom of the economy has meant that sales of wild bird food are at a record low with only half as many Brits purchasing the much needed nutrition for their garden birds as this time last year."
Some 59 per cent of Brits admit that they rarely or never feed birds during the winter.
Garden Centre Association figures show pets and aquatics sales, which include wild bird food, fell by 26 per cent in November and are down 14 per cent this year.
GCA chief executive Gillie Westwood blamed rising prices, the mild winter and the economy.
Pets at Home recommends buying fat balls rather than feeding birds milk, bread or porridge, which can be harmful to them.