It is quite possible you may not realise you have a woodworm problem until the resultant damage (done by the beetle larvae) becomes visible, as the adult beetles emerge. Depending on the wood-boring beetle species it can take anywhere...
Spring can bring out more than just the blossom on the trees and the flowers in the garden. Adult woodboring beetles start to emerge from about April, making round or oval shaped holes in timber, leaving sharp edges. These...