Why does your Citrus reticulata have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Excessive moisture in the soil prevents oxygen from reaching the roots, making Mandarin trees highly susceptible to Phytophthora. This fungal pathogen destroys root tissue, causing the tree to lose its ability to transport water, resulting in sudden wilting and leaf drop.
Citrus reticulata has a relatively shallow root system that is sensitive to rapid changes in soil moisture. A sudden period of extreme drought or, conversely, an inundation of water can trigger a stress response where the tree sheds leaves to conserve resources.
Mandarin oranges are sensitive to sudden temperature fluctuations, particularly frost or extreme heat waves. A rapid drop in temperature can damage the cellular structure of the leaves, causing them to detach from the petioles.
While nutrient deficiencies usually cause chlorosis (yellowing) first, severe depletion of nitrogen or magnesium can lead to premature leaf senescence and drop. This is common in Citrus reticulata if the soil pH is too high, preventing nutrient availability.
Your plant might also be experiencing one of these issues:
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