does anyone know what this is on my aonium tabuliforme i cant find any creature on it and it is just these few leaves affected and only the outside edge,only appeared last week
That looks like snail or slug damage. You may find them lurking somewhere dark and damp during the day, or you may catch them at work at night using a torch. They can travel quite a way (10ft or more) to feed before retreating to their daytime 'home'.
A trowel in the hand is worth a thousand lost under a bush.
Thanks Bob,I have not seen any,but will have to look a lot more carefully