Raspberry canes MUST be kept moist until they are in the ground. In fact, we believe that the main reason that canes fail to grow is from the root hairs becoming dry at some point in the planting process.
We suggest using Soil Moist root dip (see page 81). Soak the roots for 1-2 hours just before planting. From our own experience it is highly effective. It is also recommended for other plants – blackberries, strawberries, etc.