Purple japanese lilac tree1/15/2024 ![]() ![]() Verticillium wilt affects a number of plants in our landscapes, including lilac. Renewal pruning to decrease density and consistent watering will help support the stressed plant.Clean up fallen leaves to help reduce the likelihood of reinfection next season.The PDC emphasizes sanitation as it seems that the spores of Pseudocercospora can persist for several years on plant debris (leaves, stems, dead flowers, bark). Symptoms are the same as reported (yellowing then browning leaves, dieback). The Plant Disease Clinic has analyzed lilac samples this season and found the fungal disease Lilac Pseudocercospora leaf spot to be present. What are known lilac issues that might produce these symptoms? Fungal diseases ![]() Insects can cause damage and vector diseases.Storms can also cause damage with saturated soil, standing water and erosion.Drought and flooding varied throughout the state as well.Conditions like these can stress plants in various ways, slow down development, and volatilize herbicides. Day temperatures were in the 90s, nights in the 70s and dew points over 70 degrees F.July 2020 was the 14th warmest and 14th wettest since 1895.MN WeatherTalk, a weekly blog by climatologist Mark Seeley, reports that we experienced a stretch of very tropical temperatures in June and July that set records. How does weather affect the emergence of a pathogen or condition?Īccording to the UMN Plant Disease Clinic, in May 2020, we had about a week of very cold temperatures without snow cover, possibly compromising root systems. Branch dieback is random, on one shrub in the middle of a hedge, all one side of a hedge, or on individual branches.Leaves turn yellow, then brown, and then drop.Affected plants are reportedly mature and have "never been a problem" before this year.Whether specific cultivars are affected more than others is unknown mainly because most people don't know the cultivar. reticulata the tree lilac, is also susceptible. Syringa vulgaris, the common lilac, is reportedly the most affected species.Dieback on common lilac due to fungal infection ![]()
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