Bulbs Flower Basics Flower Beds & Specialty Gardens Flower Garden Garden Furniture Garden Gnomes Garden Seeds Garden Sheds Garden Statues Garden Tools & Supplies Gardening Basics Green & Organic Groundcovers & Vines Growing Annuals Growing Basil Growing Beans Growing Berries Growing Blueberries Growing Cactus Growing Corn Growing Cotton Growing Edibles Growing Flowers Growing Garlic Growing Grapes Growing Grass Growing Herbs Growing Jasmine Growing Mint Growing Mushrooms Orchids Growing Peanuts Growing Perennials Growing Plants Growing Rosemary Growing Roses Growing Strawberries Growing Sunflowers Growing Thyme Growing Tomatoes Growing Tulips Growing Vegetables Herb Basics Herb Garden Indoor Growing Landscaping Basics Landscaping Patios Landscaping Plants Landscaping Shrubs Landscaping Trees Landscaping Walks & Pathways Lawn Basics Lawn Maintenance Lawn Mowers Lawn Ornaments Lawn Planting Lawn Tools Outdoor Growing Overall Landscape Planning Pests, Weeds & Problems Plant Basics Rock Garden Rose Garden Shrubs Soil Specialty Gardens Trees Vegetable Garden Yard Maintenance

Boxwood Shrub Disease

Boxwood Shrub Disease

Boxwood Shrub Disease. English and American boxwood are popular hedge shrubs. Both types of boxwood can be affected by fungal, stem and root diseases.

English and American boxwood are popular hedge shrubs. Both types of boxwood can be affected by fungal, stem and root diseases.
Stem Diseases
Volutella stem blighti is a fungus that affects boxwoods and is thought to be brought on after winter frost; the only cure for this disease is pruning affected areas. Before spring growth begins, stems turn orange or brown and then die back.
Leaf Diseases
Macrophoma leaf spot appears on boxwood when it is affected with another disease. Characterized by dark splotches on dead leaves, Macrophoma leaf spot is a sign that something else is wrong with the shrub, probably a root disease.
Root Diseases
Two major root diseases affecting boxwoods are phytophthora root rot and root-feeding nematodes. Plants affected with these diseases will show yellowing leaves. Root-feeding nematodes are parasites that can appear at any time, while phytophthora root rot primarily emerges after the plant experiences excess water at the roots.
English Boxwood Decline
English boxwood decline affects large English boxwood plants, commonly 20 years or older, and is likely brought on by drought conditions. Foliage turns yellow then progresses to straw colored.
Disease Control
Water English boxwood in hot, dry summers to prevent boxwood decline. Avoid planting English boxwood in soil where previous plants suffered boxwood decline. To prevent phytophthora root rot, plant in well-draining soil and use raised beds; applying a fungicide to cases you've caught early can help cure plants.

Check out these related posts