Raspberry Leaves Drying Up
If your raspberry leaves are drying up and the canes are wilting and breaking off at ground level, first check to see if the plants have been receiving enough water since this is the primary cause for wilting of plants. If they are adequately watered, the raspberry crown borer may be your culprit. The larvae excavate small cavities in canes, then feed in the crowns and roots. This causes wilting of the canes, and the spindly canes usually break off at or below ground level. Check for larvae inside the canes or galls (swellings) on areas below the soil surface. It is best to remove and burn or discard infested canes.