I have a bumper crop of raspberries this year, growing glen moy and glen ample. I have noticed brown crusty marks on the tops when I pick them. the leaves on my plants seem to be being eaten away too. I have fed and watered the plants regularly. I also noticed a bug under a leaf, 3 or 4 mm long black with orange markings. Could this be my problem? If so, what is it and can the problem be cured.