Letter: Sainsbury hits back

Sir: Brian Marshall (letter, 12 March) perpetrates exactly the kind of whimsical thinking about foodstuffs that serves the interests of no-one but the pro-GM lobby. Horses, and other stock, are reluctant to eat fresh ragwort when other feed is available because the plant is extremely bitter tasting. Stock will happily eat wilted ragwort which, although less bitter, remains a serious toxic hazard. While cattle are reluctant to eat buttercups, the plant is not toxic to them.

KEITH BRAITHWAITE

London SE13