Guelder rose viburnums (Viburnum opulus) are deciduous shrubs or trees suited to smaller landscape settings.

Leaves turn silver and infected branches die back.

Soil drenches or granular applications of imidacloprid or dinotefuran will control aphids and last longer within the plant to prevent future infestations (see Table 1 for specific products). With over 150 species of viburnum shrubs and heights between 2-25 feet, there?s a variety that can fit into any landscape. Wildlife will thank you if you plant Blackhaw viburnum in the landscape. David Brittain - Author and home pest and gardening expert at Kiwicare AHM Group. COVID-19 Extension Updates and Resources ... More Information », Factsheet | HGIC 2057 | Updated: Jan 13, 2020 | Print | Download (PDF). These crawlers are pale, smaller than a pinhead and are the only mobile stage of the scale life cycle. This is because silver leaf fruiting bodies release spores during cooler, wetter periods. These versatile shrubs are fun to grow and easy to get along with. It is caused by the fungus Armillaria mellea, which is common in landscape and garden settings. They are found in the soil around the viburnum roots. However, it never hurts to practice occasional viburnum pruning each year to maintain shape and overall beauty. Prevention & Control: Light infestations of scale can be scraped off by hand. However, due to the size these plants can grow, not every gardener has a space big enough to accommodate them. have saved, or view now. Viburnums have long been one of our most popular flowering landscape shrubs, with more than 150 species available. These versatile shrubs are fun to grow and easy to get along with. If you are looking for a flowering shrub that will add beauty to your landscape, one of the popular Viburnum shrubs may be a great addition.

Soaps and oils must be sprayed onto the aphids to be effective. When planting viburnum or other nearby plants, allow for adequate plant spacing.

To avoid killing these beneficial insects which reduce thrips populations, insecticides should be avoided as much as possible.

Oystershell scale (Lepidosaphes ulmi).Whitney Crabshawm Colorado State University, Bugwood.org. The grubs cause more significant damage than do the adults. Avoid using more toxic insecticides unless the plant is seriously damaged from the scale infestation. Pest Advice

Find more info on Koreanspice viburnum here. Root and crown feeding by the grubs may kill the shrub. As a result of their small size, thrips are difficult to detect before damage is obvious. Native to Europe, VLB was accidentally introduced to North America sometime in the last century. My Kiwicare. If sufficient bark is removed, the leading edge of the fungal growth will be found, and this white growth has a characteristic fan-shape. Prevention & Control: Provide good growing conditions for the viburnum, especially additional water during droughts, good soil drainage, and proper fertilization. Clemson University Cooperative Extension Service offers its programs to people of all ages, regardless of race, color, gender, religion, national origin, disability, political beliefs, sexual orientation, gender identity, marital or family status and is an equal opportunity employer.

A variety of leaf spots are caused by the fungi Cercospora spp., Phoma spp., and Phyllosticta spp. To sample for thrips on viburnum foliage, hold a sheet of stiff white paper under injured leaves, and then shake or tap the branch. Prevention & Control: Many foliar problems can be prevented by keeping leaves as dry as possible.

Leaf spot is not uncommon with Laurestinus viburnum, and is usually due to moist, damp conditions.

Flower thrips (Frankliniella tritici) and various other thrips species are pests of viburnums. The spots enlarge to form angular patches between the leaf veins. Horticultural oil may be sprayed when temperatures are between 40 and 85 °F. So how do you go about growing this viburnum in your garden? Two or three applications may be required at 7- to 14-day intervals. Avoid overhead irrigation and improve air circulation with adequate plant spacing and selective branch pruning. Prevention & Control: For successful control, treatments should be directed at the adult weevils. Only apply horticultural oils or insecticidal soaps if temperatures are below 85 °F.

Viburnum is a plant for all seasons that never fails to disappoint. If they have irregular brown spots that are sunken and dry, they may have a fungal spot disease. For sweet viburnum information, click here.

This member of the large viburnum family offers showy, snowy spring blossoms with a very appealing scent.

The leatherleaf viburnum's creamy white blossoms never fail, even when the shrub is planted in the shade. Apply when symptoms first appear and repeat every 10 to 14 days as needed. Rake up and destroy infected fallen leaves. Find your closest retailer.

Join My Kiwicare for tips, tricks and seasonal reminders. Upon entry via a wound, the fungus kills cambium and sapwood tissue, causing sunken dead areas called cankers. Click here for more info. Follow all directions, precautions and restrictions that are listed. Monitor the crawler emergence in the spring with sticky cards, double-faced tape wrapped around a branch, or by putting an infested shoot or leaf into a baggie and watching for crawler movement.