Why does your Rhododendron lutescens have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Excessive soil moisture or poor drainage leads to the development of Phytophthora species, which attack the root system of Rhododendrons. As the roots decay, the plant can no longer support foliage, resulting in rapid leaf senescence and drop.
Rhododendron lutescens is sensitive to sudden extreme temperature shifts or prolonged dry periods. A sudden drop in humidity or high heat can trigger an emergency physiological response where the plant sheds leaves to conserve moisture.
As an acid-loving species, if the soil pH rises above 5.5-6.0, the plant cannot uptake essential micronutrients like iron. This physiological stress can lead to chlorosis and subsequent premature leaf drop.
High humidity and poor air circulation around the foliage can promote fungal pathogens that cause spotting and rapid defoliation. This is particularly common in dense plantings where moisture lingers on the leaves.
Your plant might also be experiencing one of these issues:
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