![]() The first step if you note signs of fungal leaf spot is to remove any sick leaves, which might mean removing entire branches. The disease can also cause shoots to die back. These leaves might eventually drop from the plant.īut regardless of whether they fall or not, the plant will be stunted and weakened because it isn’t photosynthesizing as well as it should, especially if a high percentage of the foliage is impacted. reticulata) are particularly susceptible.ĭuring the spring and summer when temperatures are around 75☏, especially with high humidity, affected leaves will develop these dark green or brown patches that stop at the veins, so they have a sort of angular appearance. The same fungi will attack all plants in the Syringa genus as well as guava, mulberry, and olive trees. Fungal Leaf Spotįungal leaf spots are caused by fungi in the genus Pseudocercospora. reflexa species are resistant to some degree. ![]() On the other hand, ‘Cheyenne,’ ‘Edith Cavelle,’ ‘General Sheridan,’ ‘Glory,’ ‘Katherine Havenmayer,’ ‘Montaigne,’ ‘President Grevy,’ ‘Pink Elizabeth,’ ‘Saugeana,’ and the S. If you’re really concerned about this disease, be aware that white lilacs seem to be more susceptible.Ĭultivars including ‘Annabel,’ ‘Burgundy Queen,’ ‘California Rose,’ ‘Charm,’ ‘Edward Gardner,’ ‘Etna,’ ‘Little Boy Blue,’ ‘Monge,’ ‘Olimpiada,’ and ‘Yankee Doodle’ seem to be particularly susceptible. Keeping your plant healthy with appropriate watering and feeding helps lilacs to withstand infection, and if yours does contract the disease, this can help it survive.Īppropriate spacing and pruning for airflow are also important. But if you use clean tools and prune only when the weather is dry and calm, and when it’s expected to stay that way for the next few days, this will limit the chances that the pathogen will infect the wounds. Obviously, you can’t avoid pruning altogether. Minimizing splashing and always cleaning your garden tools with soap and water before and after use adds another layer of preventative protection. It’s easier said than done, but if you avoid damaging your lilacs and you’re able to keep pests away from your plants, it will go a long way toward keeping this disease away. The pathogen needs to have an opening to get into the plant. Given cool, wet weather, it starts to spread like wildfire. On top of that, it’s spread by water, wind, pests, and garden tools. What I’m trying to say is that it’s really hard to avoid. It can live on the most minute piece of material in the soil. The bacteria overwinters in fallen debris, within the plant itself, or in nearby weeds. New buds will turn brown and drop from the plant. When the lesions form on the stems and branches, it can cause girdling and death. In the spring, when the shrub is sending out new, tender growth, it will turn brown and rot. As that takes place, the leaves start wrinkling and curling, and they might drop off the bush.
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