Each slightly fragrant bloom features inconspicuous golden green blotches that age to reddish-brown. form a strategic partnership called N.C. PJM Rhododendron ‘Amy Cotta’ * ‘Amy Cotta’ is a new version of the PJM Rhododendron that has lavender pink flowers. Foliage: Winter, purple Bloom: Spring, April. 0:48. PJM should not be planted in wet areas as root rot can be an issue, but also should not be allowed to dry out. Chlorotic (a yellowing of the leaves) azaleas and rhododendron are a common sight in the Indiana landscape. Rhododendron and usually elliptic, leathery and dark green. Rhododendron hybrids considered to have some resistance include Boursault, Cunningham's White, English Roseum, Lebar's Red, Roseum Elegans, and Roseum 2. Rhododendrons (including deciduous azaleas) may be attacked by several diseases, causing unsightly foliage or a lack of flowers. It takes it’s name because it grows well in the Pennsylvania, Jersey, and Maryland region. The Garden wouldn't be the Garden without our Members, Donors and Volunteers. One potential Rhododendron problem is that the leaves are turning yellow. Question by Mufasa345919 August 19, 2002. Proper soil preparation is also necessary for the health of this acid loving plant. The leaves are curling ... overall plant to your county extension or to professionally trained nursery staff for a definite identification of the problem. Cooperative Extension, which staffs local offices in all 100 counties and with the Eastern Band of Cherokee Indians. Diseases include canker, crown rot, root rot, leaf spot, rust, and powdery mildew. Botrytis blight Small, water-soaked lesions develop on petals. See: Azalea (Rhododendron spp. They should be at the same level as they were in their container. Tolerates damage by rabbits. Soil preparation is best accomplished in autumn before planting the rhododendron in spring. We see no disease or insect problem.First, remove all mulch from the base of the plant. Insects, Diseases, and Other Plant Problems:  Rhododendrons are susceptible to insect and disease problems. Perfect for cold-season color....and it's the first Rhododendron to flower in the spring. Rhododendrons are fibrous, shallow rooted plants that need good drainage to perform well. It should be kept back a few inches at least and be about 2-3" deep. A healthy plant in the right place with proper maintenance should have few problems. When to plant rho… rhododendrons are a group of hybrid culitvar shrubs created by breeding Rhododendron carolinianum with R. dauricum var. Full sun can scorch the leaves and the roots rot if soil does not drain well. Rhododendron diseases. A healthy plant in the right place with proper maintenance should have few problems. If the pH of the soil is much above or below these fig-ures, it should be adjusted. Wet soils are not good to plant into. When you planted, Maryland was suffering from highly abnormal rainfall. We have what was a beautifully thriving rhododendron{PJM} that suddenly looks as if it is dying. Borers are wormlike, 1/2-inch long yellowish-white larvae of moths. Thirdly, the plants need ample moisture. The rhododendron bush is an attractive, blooming specimen in many landscapes and is fairly low maintenance when planted properly. Insect problems include aphids, borers, lacebugs, leafhoppers, mealybugs, mites, nematodes, scale, thrips and whitefly. Cooperative Extension prohibits discrimination and harassment on the basis of race, color, national origin, age, sex (including pregnancy), disability, religion, sexual orientation, gender identity, and veteran status. If their location near a wall is hot and gets a lot of reflected light and hear, azaleas are not going to do well there. My soil is quite sandy and drains well so when I planted I mixed up a bunch of compost with some top soil. The 1,0140 known species of Rhododendron range in size from 4 inches to 100 feet tall, with over 20,000 hybrid varieties. Diseases include canker, crown rot, root rot, leaf spot, rust, and powdery mildew. As long as site conditions are good, it has a chance of filling back in for you. They have been watered by an irrigation system and fertilized yearly with HollyTone for acid plants. Rhododendrons are shrubs with showy flowers in spring, usually in shade of white, pink, purple and red. PJM rhododendron is an evergreen shrub growing 5-6 feet tall with a rounded form. How should we manage this? Otherwise it encourages disease and pest problems.Then, prune out the dead material. Azaleas can regrow after a lot of pruning. Members of the genus Rhododendron support the following specialized bee: Andrena (Andrena) cornelli. Rhododendrons and azaleas are acid loving plants meaning that the soil needs to be slightly acidic to optimize growing conditions. Disease pests include blights, canker, crown rot, leaf gall, root rot, leaf spot, rust and powdery mildew. Two diseases, branch die-back and Phytophthora root rot in particular, are opportunistic this way. Wildlife Value: Tolerates damage by rabbits. Rhododendrons include over 800 species of plants in the Ericaceae family. Dappled shade is preferred; full sun may result in leaf scorch. Are the plants dying or what is the best course of action? The … Rhododendrons and azaleas are susceptible to many insect and disease problems. Cause Leaf scorch on rhododendrons is a response to stress. One major cause of chlorosis is a deficiency of either iron or manganese Leaves are the best indicators of plant problems. Rhododendron x ‘P.J.M.’ is a broadleaf rhododendron hybrid popular in North America. It's considered a "dependable bloomer" because you get consistent color, no matter what the conditions! 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