It is thought to be spread by the Rhododendron Leaf Hopper, an insect that doesn’t do much damage to the plant other than spreading this fungus around. Some have a yellow halo and some will have tiny dark pimples inside the larger spots. Although it’s unsightly, leaf spot is only a significant problem on poorly growing or unhealthy plants, which might end up dropping a substantial number of leaves. Jump to navigation Jump to search This article is a list of diseases ... Coryneum leaf spot Seimatosporium rhododendri = Coryneum rhododendri. For Cercospora leaf spot on rhododendron use propiconazole, thiophanate-methyl, chlorothalonil or mancozeb. Damping-off, Pythium Pythium spp.

A leaf spot … Leaf scorch and leaf spot symptoms in early April as a result of winter injury (Photograph by Thomas Kowalsick, Cornell Cooperative Extension – Suffolk County) appear on the leaf blades of rhododendron during the winter. Rhododendron flowers and buds are attacked by …

​Rhododendron Cercospora leaf spot (Cercospora handelii) is an unsightly common rhodo fungal disease that takes its toll if conditions are not improved to reduce infection. Apply these fungicides according to directions on the label. Lower leaves are affected first with irregular brown spots that eventually the spots turn lighter tan in the center. Rhododendrons are at their best in spring when they produce large clusters of showy flowers against a backdrop of glossy green foliage. Management . This disease, caused by the fungus Glomerella cingulata,  results in rounded spots on the leaves. Other Problems. Leaf Curl: Rhododendron leaves begin to cup and curl at the edges when temperatures drop to below 35 ºF. Leaf spot diseases weaken trees and shrubs by interrupting photosynthesis. Even pests like aphids, bark beetles, spider mites, scales, weevils, and caterpillars can attack this plant. In seasons to come, try to water your plants so that the foliage isn’t frequently splashed with water. The majority of leaf spotting diseases are favored by cool, wet, spring weather. See Table 1 for examples of products. These are usually reflections of poor health in the root system or in the branch - one common cause is rhododendron borer activity below the affected leaves. Examine the plant carefully and determine which of the symptoms best describe the condition observed. These problems have been common in this area and is a very serious disease.

In addition there are many different fungi that have been found less frequently in association with leaf spots on rhododendron in the PNW. Cylindrocarpon canker and wilt Cylindrocarpon destructans = Cylindrocarpon radicicola. Cryptostictis leaf spot Seimatosporium mariae = Cryptostictis mariae. Brown spot often occurs in rainy season and humid weather. No need to register, buy now! Symptoms Spots are dark brown, zonate, and frequently cover half the leaf area. Find the perfect rhododendron leaf spot stock photo. Six species have been reported in Washington.

No need to register, buy now! Leaf spot diseases should be taken seriously if they result in moderate to complete leaf loss two to four years in a row. The canopy of the rhododendron can look healthy and full and the buds big and bulbous, but you can still have a fungus lurking within the plant.

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