Q. My rhubarb has some type of bug. It’s planted at the edge of my garden. It’s not as hearty as it was in the past, and now it has brown spots. – Phyllis Clark A. Crown rot can cause brown, sunken, water-soaked spots on the base of the leaf stalks. Leaves yellow, and stalks collapse and die. The disease thrives in waterlogged, heavy soils and attacks the crown and base of the stems. In […]