We put on our first heavy coating of a super refined kaolin clay today, a product called Surround. We use it as a deterrent to keep certain bugs from damaging the fruit. The particles come off on the bugs as they try to move through the tree thus irritating them and hopefully making them want to move on. It can be a pain as it can wash off easily in the rain so for the next 4-6 weeks we will have to keep reapplying after heavy rains.