Few leaves or excessive leaf fall. Contact a pest control adviser about soil fumigation. Of course, this is only an option after you buy it. Give your tree a spray of 30g Mancozeb, 4.5 litres water & 30ml of a good wetting agent. Avocado cercospora spot is a common and frustrating fungus that thrives on the tissues of avocado trees. Small branches die back at top of tree. Avocado tree shoots die back from the tips, and eventually the tree is reduced to a bare framework of dying branches. If detected early; otherwise, cut off the tree at ground level and fumigate soil. An avocado that’s ready to eat has light green flesh. avocado root rot ‐ Fumigate small spots of disease. It is characterized by a sudden wilt of the tree. Very young trees tend to become diseased, rather than old ones. If yours are dying back, it might be because of some disease that I’m unfamiliar with. An avocado doesn’t start to ripen until picked from the tree, but the process happens rather quickly afterward. The leaves turn brown and remain on the tree. Avocado tree death may take from a few months to several years, depending on soil characteristics, cultural practices and environmental conditions. Leaves may turn brown but hang on the branches for months. Cotton Root Rot (fungus – Phymatotrichopsis omnivora) : Although avocado is susceptible to cotton rot root, it is not a common disease. Read on for a more in-depth discussion of this chronic disease of avocados. Common symptoms of disease include:Leaves: small leaves that are pale green, yellowed, blotched or blackened. Could it be avocado black spot, more commonly known as cercospora spot in avocados? The leaves have a red pigmentation when they … The wetting agent is the key. Avocados normally get black spots on their young branches, but it is not a problem. It’s possible that your climate in Kenya is conducive to it whereas our drier climate in California isn’t. A rotten one has brown or black spots throughout the flesh. Those black spots. If your avocado tree is affected by Phytophthora cinnamon, it may eventually decline and die. I'd spread a lot of gypsum around your avocado tree, say 4 handfulls / sq m. Spray the tree once a week for 4 weeks, then once a month 'till it clears up. As much as we all wish that avocado trees could be a plant it, forget it, and harvest affair, caring for your tree requires consistency and vigilance. Avocado, Persea americana, is an evergreen tree in the family Lauraceae which grown for its nutritious fruit, the avocado.The avocado tree is large and dome shaped with oval or elliptical leaves arranged in a spiral on the tips of branches. Avocado trees affected by this usually lack small roots or have small roots that are black. Once you cut an avocado, it’s easier to determine whether it has gone bad. ‐ Fungicides. A healthy avocado tree has glossy, dark green leaves, intact bark and plenty of blossoms. The health of your tree can and often does have a huge poor color. 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