Citrus trees naturally shed leaves from time to time. We cover most Citrus Pests & Diseases in this manual and include photos to make it easier for you to figure out what's wrong with your Citrus Tree. •Juvenile psylla deform flush terminals, causing a Signs/Symptoms. The leaves have a life span of around 3-4 years, so they will simply drop off after that. Citrus stubborn disease (CSD) Barnfield Navel tree showing bunchy growth and leaf chlorosis. 5. That's natural. The virus can cause the tree to decline, leading to tree death. Area(s) affected. •Eggs are laid only on new flushes. There are three distinct syndromes of the disease: quick decline, stem pitting, and seedling yellows. Citrus Tree Diseases: Citrus Canker Citrus canker is a disease that, as its name suggests, can affect your citrus trees. Click on photos to enlarge Aboveground dieback. Here is a list of the most common aliments of the citrus tree and tips on how to overcome them. SOOTY MOULD Sooty mould is common on citrus. Transmission can happen through the air, through animals, or through insects, and can spread rapidly. Use our Citrus Pest & Disease Problem Solver to correct any issues that may arise while caring for your Citrus Trees. Citrus trees are one of the most productive and easy to grow trees in the home garden but just as we love to reap their rewards so do pests. Asian Citrus Psylla •Primary vector of citrus greening disease. •Adult psylla are sexual and can survive for extended periods of time feeding on mature leaves and forego reproduction until new leaves are available. Armillaria root rot Identification tip: Pale and wilted foliage, few leaves, and limb dieback are symptoms of Armillaria root rot, dry root rot, Dothiorella gummosis, and Phytophthora root rot.Look for cankers and oozing gum, cut under bark to inspect cambium and wood, and examine roots to help diagnose the cause. 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