Despite its usual hardiness, in the spring and fall, some leaves may turn grayish white. If your trees and shrubs are NOT showing signs of Powdery Mildew yet, that’s great! Thriving in times of high humidity and dry conditions when temperatures are 11 to 28°C, powdery mildew can spread to the buds, stems and fruit if conditions are favourable. Preventive sprays may be worthwhile for susceptible plants. This product was manufactured by Syngenta AG, a Swiss concern which is one of the leaders in the production of crop protection products and seeds. C. ... from treatment until the treated area can be safely entered without protective clothing. Powdery mildew spores can germinate and infect crape myrtle in the absence on free water on the plant tissue, as long as there is adequate humidity in the air. Learn which plants thrive in your Hardiness Zone with our new interactive map! Powdery Mildew On Dogwoods And Crape Mrytles Standard - by Samantha Huff - July 2, 2015 - No Comments If you have Lilacs, Peonies, Dogwoods, or Crape Myrtles you may have noticed an unsightly white substance building up on the leaves of your trees and shrubs in the next couple of weeks. Make sure to cover the entire plant, including the upper and lower sides of the leaves and coat the stems. As the infection spreads, these tiny spots become larger. Leaves, shoots, and flower buds are covered with a thin layer or irregular patches of a grayish white powdery material. For more information about crape myrtle varieties: Aggie Horticulture – Information about varieties that have powdery mildew resistance and are good choices for Texas. If you prefer to use a nonchemical fungicide, choose one that contains neem oil, sulfur or potassium bicarbonate. Powdery Mildew Symptoms: Symptoms are typically seen on trees that are shaded and lack good air flow. Heavily infected flowers may fail to open. It can affect almost any type of plant, appearing on leaves, flowers, fruits and vegetables. Crepe Myrtle with Powdery Mildew. Prune any dead branches, but also prune any small, twiggy undergrowth near larger branches. Additionally, crape myrtle should be planted in sunny locations allowing free air movement so wet foliage dries quickly. A white powdery fungus called powdery mildew sometimes attacks the leaves of many older selections of crepe myrtles. Prevention is the best management method. The best way to avoid powdery mildew is to plant one of the cultivars bred and selected for resistance to powdery mildew. A protectant fungicide will only help prevent the infection in healthy trees. Powdery mildew is easier to avoid than control. The spores like humidity but hate rain and water. It is best to prevent the growth of mildew, but if your tree is already infected, following these steps will help you restore it to its former beauty. Powdery mildew is a plant disease caused by a fungus. Get free shipping on qualified Powdery Mildew Fruit & Vegetable Disease Control or Buy Online Pick Up in Store today in the Outdoors Department. Spray your crepe myrtle with fungicides as soon as you see mildew on the leaves. Remedies for Powdery Mildew There are lots of home remedies but researchers have found that simply spraying with plain water weekly can be effective. susceptible to powdery mildew. Powdery Mildew Fungus on Trees. All Rights Reserved. This fungal growth results in a powdery appearance on the plant surface, hence the common disease name, powdery mildew. In the fall and early winter, the fungus produces an ascoma or clietothecia—an overwintering structure. Milk Treatment. Washing your crepe myrtles with a strong spray of hose water may be enough to dislodge small aphid populations and honeydew. Asked July 9, 2017, 3:08 PM EDT. 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