![]() ![]() Avoid planting dogwood's and forsythia as those are susceptible to the P. Avoid overwatering if irrigating the area. When replacing plants in the same location, some plant that should not become affected by this pathogen and that can thrive in Iowa include chokeberry, witch hazel, ninebark, fragrant sumac, spirea, snowberry/coralberry, and arrowwood viburnum. To manage this disease remove infected plants and if replanting in the area, select plants that are not susceptible to P. Older landscape plantings can still thrive despite high disease pressure. Losses can be substantial due to this disease in nursery production. Unfortunately, there are no fungicide treatments that can cure lilacs of this malady, and the pathogen can persist in the soil for many years. syringae, the bacterium that also causes bacterial blight of pear, blueberry, cherry, maple, and many other woody plants. What causes trees and shrubs to die The presence of an insect or disease may not be the cause of the problem. What can you do after your plant was diagnosed with Phytophthora shoot blight? Tips for diagnosing plant problems The majority of plant problems are not caused by a disease or an insect, especially if the plant has been in your landscape for less than two years. Lilacs perform well in clay soils, but slow water drainage leads to excess moisture in the root zone, the perfect condition for the pathogen Phytophthora cactorum to thrive. The symptoms can be confused with environmental injury, including drift or herbicide misuse, bacterial blight and in some varieties symptoms may be similar to Verticillium wilt. But even though the initial symptoms are on the leaves, the pathogen resides in the roots. For control, remove and destroy affected plant parts and as a chemical method, apply fixed-copper chemicals labeled for use on mock orange plants. Damage consists of the dieback of shoots as well as leaf deformation. Infected older shoots show dying leaves as the infection enlarges along the stem. These spots become black with age and cause death of leaves and young shoots, which may bend over at the infection site. This pathogen causes extensive shoot blight and root sprouts at the base can be killed over time. Bacterial blight often attacks mock orange trees when weather is cool and moisture is high. Biology Bacterial blight starts as brown spots on leaves and stems in the early spring. Phytophthora shoot blight in lilacs is caused by the water mold Phytophthora spp., commonly by the species P. 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. Bacteria blight of lilacs, also called shoot blight or blossom blight, affects lilac bushes usually in the spring during wet periods. Water molds belong to the Oomycetes (also known as Stramenopila), microorganisms that despite their similarities with fungi, are closely related to algae. ![]() Lilacs can suffer from vascular pathogens and bacterial diseases, but also a blight caused by a water mold. syringae or bacterial blight is a common disease affecting not only lilacs, but also other woody plants such as blueberry bushes and cherry, maple and pear trees.
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