My wisteria is sick. There is no new growth. The leaves are starting to wilt and I can't find anything in my books. Thought it was lacking in water but the soil is moist. Can't see any signs of pests. There is a little bit of marking around the base of the trunk though. The bougainvillea is in the same area and it hardly flowered this year. There are few leaves appearing and these two plants are only three years old.