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A: This is viburnum leaf spot and it is quite common.

Discuss diseases and insect pests common to roses grown in the maritime Pacific Northwest, including black spot, rust, cercospora leaf spot, powdery mildew, crown gall, cankers, rose mosaic virus and more via Zoom 6:30-8:15 p.m.

Other common ailments are Alternaria leaf spot, white mold, bean rust, and mosaic virus, which can be avoided by keeping leaves dry and trellising or pruning to allow maximum airflow between vines.

Bacterial leaf spot, or basil shoot blight, is a major uh-oh when it comes to pathogens.

I am seeing fungal leaf spot diseases on dogwood trees, for example, and I’m hearing reports of the blackening and death of tomato plants, perennials and annuals.