Why does your Dahlia Corona Beach have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
As a heavy-feeding tuber, Dahlias require significant nitrogen to maintain lush green foliage. A lack of available nitrogen causes older leaves to turn pale yellow first as the plant mobilizes nutrients to new growth.
Dahlia tubers are highly susceptible to rot if the soil remains waterlogged. Excessive moisture deprives roots of oxygen, leading to chlorosis (yellowing) and eventually stem decay.
Fungal pathogens like Botrytis can cause leaf discoloration. While often characterized by brown spots, the initial stage in humid conditions involves a general yellowing of the foliage.
Tiny spider mites feed on the sap of Dahlia leaves, causing a speckled yellow appearance. Severe infestations can lead to widespread chlorosis across the entire plant.
Your plant might also be experiencing one of these issues:
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