"Paul Taylor" wrote in message
news
Hi,

I have a bay tree, planted a year or two ago, and it looked healthy until
recently - the leaves have changed from a glossy dark green to a kind of
pale green yellowy colour.

I have noticed a lot of red ants on the earth around the bay tree.

Don't think the little red 'uns would cause much harm. More likely that your
soil is pH neutral or towards chalky/lime. Bay likes acid soil so give it a
good dose of ericaceous feed, the sort they sell for heathers,
rhododendrons, camellias (and laurel).
DaveK.