The disease can cause leaves to drop off the viburnum. A fungicide containing mancozeb or chlorothalonil is effective against downy mildew. I have 5 large full-gown viburnums planted in full sun. Select the one that’s right for your space. tomentosum) If so, the leaves do droop naturally. I have three leather leaf viburnums in my yard -- located with 30 feet of each other. Pictured is Viburnum tinus ‘Spring Bouquet’. Butterflies enjoy the blooms. Your plant looks fine to me. Powdery mildew: White fungal growth forms on the upper surface of leaves. Last year, two started not to look so good: leaves dried up on half of each bush but the other halves continued to look vigorous. Since the mildew spores can survive through the winter, gardeners should clean up any fallen leaves or plant debris regularly. If the branch and leaves seem to be unaffected after that time, you should be able to use sulfur on the plant.) Severely affected leaves fall. Apply a fungicide as soon as any disease is observed. Overall, they're looking sparse. Light- colored fungal growth sparsely covers the spots on the underside of the leaf. ... Mow leaves on grass (if not raking to beds or compost) to break them down; Although the majority of the plant does have the green leaves, there seems to be enough of the discolored leaves to let me know there is something wrong with the plant. Arrowwood (Viburnum dentatum) This variety can tolerate partial shade. Asked April 26, 2019, 9:41 AM EDT. With powdery mildew, young viburnum leaves and shoots develop a white to light gray fungus covering on leaves. My Chindo Viburnum bush has many yellow, brownish leaves. Two of them are absolutely thriving and healthy. Some get as tall as 20′, while others are shorter. Snowball bush (Viburnum opulus) Viburnum sargentii is a robust, deciduous viburnum, with maple-like leaves and lacecap flowers in spring and summer. H x S: 2.5m x 1.5m. The viburnum leaf beetle is an invasive bug from Asia and Europe that was introduced to North America in the late 1970s in Canada. Rain helps to slow this viburnum disease, which is always more severe on plants sited in shade. Their growth rate should increase after the first year. This year all 5 flowered, but all 5 have VERY tiny leaves. Your plant looks fine to me. It reaches 6-15 feet (2- 4.5 metres) tall and has white flowers. ‘Onondaga’ is a lovely cultivar, with red-bronze young foliage, that greens up as it matures. Plasmopara viburni: Rake and destroy fallen leaves in the autumn. It has attractive blue berries in the autumn which contrast with leaves that change to a dramatic purple-red at this time of year. Your viburnum bushes are deciduous, which means they will drop their leaves each fall. Powdery mildew can show up on leaves, but don’t spray with sulfur-based sprays lest you damage the leaves. Drooping Leather Leaf Viburnum. The middle one lost several major branches over the winter, the leaves are drooping and some are turning yellow. Most shrubs and perennials will not grow significantly the first year they are planted, at least there won’t be much visible growth. Does it look like this one Doublefile Viburnum (Viburnum plicatum var. Powdery mildew, a viburnum disease caused by a fungus, tends to develop when the weather delivers warm days, cool nights and high humidity. As with any newly planted shrub, tree, etc., it need to be well watered regularly for the 1st year or until the roots are established in the new location. The powdery mildew fungus prefers wet conditions and cool or warm weather. It’s a non-native, but very drought-tolerant, and works in shade to sun, as do most viburnums. Avoid overhead irrigation in the spring. It’s making its way south and causing a lot of damage to viburnum, devouring every leaf on a tree. Tips for growing viburnums. 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