Strange marks on tomato leaves in greenhouse!

Very difficult to describe, looks a bit like the groups of eggs some insects
make.

What, if anything, can I do about it?

"Alan Holmes" wrote in message
...

Strange marks on tomato leaves in greenhouse!

Very difficult to describe, looks a bit like the groups of eggs some
insects make.

What, if anything, can I do about it?

Defining what it looks like more accurately might help somebody. For
example; size, colour, above or below leaves . . . .

Geoff