If you need help with your plant problems, the PIDC is happy to help. with progressive branch wilting at a slower pace. Lilacs are also susceptible to verticillium wilt, where the leaves will look droopy and water-deprived, change from green to yellow to brown, and drop. When assessing your lilacs, it is also good to examine the stems and trunk for evidence of any mechanical injury that may be caused by animals, mowing equipment, or borers. With root rots, shrubs develop less defined foliar symptoms (no spots nor mildew on top) and tip die-back. See Phytophthora shoot blight on lilacs Lilacs perform well in clay soils, but slow water drainage leads to excess moisture in the root zone and is prone to root rots. This will increase air circulation (reducing foliar fungal diseases), improve appearance, and as an added benefit, promote better flowering. Consider renovating your established lilacs. Providing good, consistent care by making sure shrubs get at least 6 hours of direct sunlight a day and watering during drought periods can help lilacs thrive. Pruning Ornamental Shrubs is a resource to help with that. Always prune in dry weather, and after each cut, disinfest pruning shears by dipping them for at least 30 seconds in a 10 bleach solution, or alcohol (spray. These problems are good reminders that good care and pruning can help improve shrub health in general. Bacterial Blight on Lilacs can be controlled by pruning diseased twigs 10 to 12 inches below the point of visible symptoms and dispose of the branches by burning or burying them. Because of this and the fact that lilacs tend to be large and difficult to effectively spray fungicide on, fungicide applications are rarely warranted. If repeated severe infections occur, preventative spring to early summer fungicide applications may help prevent diseases (but won't eradicate them). Removing and destroying leaf debris and pruning out dead branches may be the best strategy in reducing diseases in general for shrubs and trees.įungicide treatments should not be considered late into the summer. See our articles on lilac diseases: Lilac Pseudocercospora leaf spot, powdery mildew What management practices are recommended?įungal leaf spots alone rarely become severe enough to cause the decline or death of the plant. Lilac blight is a bacterial disease spread by the wind and rain, affecting many species of lilac. Top: spots of various sizes, random distribution can coalesce and blight the leafīottom: magnification showing Pseudocercospora spores Environmental conditions, humidity, and stressors like drought, shaded locations, or lack of proper pruning could be exacerbating these problems. Ascochyta blight causes new shoots and flower stalks to wilt and turn brown, encircled by dead areas that have gray to tan, shriveled bases. With summer comes lilac leaf spots at the plant clinic this year, we have seen the usual fungal pathogen Pseudocercospora causing leaf spots and blight (rapid death). Historically, Septoria leaf spot and powdery mildew also contribute to leaf blight, and in some cases, to abundant leaf drop.
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