Diagnosing Yellowing Leaves on Aucuba Shrubs

Why Are My Aucuba Leaves Turning Yellow?

If your aucuba shrubs, planted last fall, are now dropping yellow leaves from the bottom up, two main causes are likely: winter stress or a fungal infection.

Winter Stress

In colder regions, aucuba may shed older leaves as a natural rejuvenation response to winter conditions. This is typically temporary; new growth should appear in spring.

Fungal Issues

Fungal diseases like Phyllostica aucubae often follow scale insect infestations. Look for brown or black spots, especially along leaf margins. Severe cases cause significant defoliation.

Action Steps

Inspect leaves for spots or scales. If fungal symptoms are present, apply a fungicide approved for your state. Improve air circulation around the plants. For a precise diagnosis, clear photos of the affected foliage can help a professional identify the exact problem.