If detected early; otherwise, cut off the tree at ground level and fumigate soil. The wetting agent is the key. Even strong, healthy trees can fall victim to severe weather, disease, or infestation. I'd spread a lot of gypsum around your avocado tree, say 4 handfulls / sq m. Those black spots. It’s possible that your climate in Kenya is conducive to it whereas our drier climate in California isn’t. Give your tree a spray of 30g Mancozeb, 4.5 litres water & 30ml of a good wetting agent. Here's what the brown spots, bruises, and stringy black lines on your avocado flesh mean — and whether it's still okay to eat: ( Courtesy Food52.com ) Oxidation Small branches die back at top of tree. Of course, this is only an option after you buy it. ‐ Fungicides. 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. It is characterized by a sudden wilt of the tree. Avocado trees affected by this usually lack small roots or have small roots that are black. You can prevent this pathogen by planting your avocado tree in well-drained sites. A healthy avocado tree has glossy, dark green leaves, intact bark and plenty of blossoms. A rotten one has brown or black spots throughout the flesh. Once you cut an avocado, it’s easier to determine whether it has gone bad. An avocado that’s ready to eat has light green flesh. Very young trees tend to become diseased, rather than old ones. If your avocado tree is affected by Phytophthora cinnamon, it may eventually decline and die. avocado root rot ‐ Fumigate small spots of disease. Could it be avocado black spot, more commonly known as cercospora spot in avocados? Avocados normally get black spots on their young branches, but it is not a problem. Between homemade smoothies, skin care, and good old-fashioned guacamole, who doesn't love a fresh, ripe avocado? Spray the tree once a week for 4 weeks, then once a month 'till it clears up. Trunk/Bark: Mottled, streaked, cracked or rough bark. poor color. What is Avocado Cercospora Spot? Contact a pest control adviser about soil fumigation. The health of your tree can and often does have a huge Few leaves or excessive leaf fall. The leaves have a red pigmentation when they … The leaves turn brown and remain on the tree. Cotton Root Rot (fungus – Phymatotrichopsis omnivora) : Although avocado is susceptible to cotton rot root, it is not a common disease. Leaves may turn brown but hang on the branches for months. Avocado cercospora spot is a common and frustrating fungus that thrives on the tissues of avocado trees. Avocado tree shoots die back from the tips, and eventually the tree is reduced to a bare framework of dying branches. We used to call them 'oil spots'. Common symptoms of disease include:Leaves: small leaves that are pale green, yellowed, blotched or blackened. 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