Azaleas are a part of the genus Rhododendron and most varieties are hardy in United states of america Division of Agriculture zones 7 to 9. An azalea plant dropping its leaves within the fall might not be trigger for alarm, but if other symptoms including wilting or leaf spots happen, defoliation might indicate a illness or cultural difficulty.
Azaleas Losing Leaves

Water


Azalea leaves that turn brown and drop off throughout the summer season months might be warning you that your plant is acquiring either a lot of water or not adequate. Established azaleas require only 1 inch of rainfall or watering per week throughout the developing season. When the climate is hot and dry, you might require to boost watering, but if dryness isn't the issue, cautiously dig up the roots and inspect them. Azalea roots which are not over-watered are firm and crisp. Waterlogged roots are brown and mushy.

Phytophthora Root Rot


Phytophthora root rot (Phytophthora cinnamomi) impacts azaleas along with other landscape plants when excessive moisture and warm temperatures above 80 degrees Fahrenheit favor improvement of infection. Symptoms contain dropping of leaves, loss of vigor and branch dieback. The roots of infected plants are reddish-brown and brittle. Handle of Phytophthora root rot is restricted to stopping the spread of infection to nearby plants together with the application of fungicides containing fosetyl-Al. When applying fungicides, comply with label prices and security precautions. In line with the University of California, fungicides alone will not manage root and crown rots. You have to also comply with correct watering practices and supply excellent drainage.

Twig Blight


Phomopsis twig blight can be a illness of established azaleas inside the landscape. Symptoms of infection start as leaves wilt, die then fall in the branches. Beneath the bark of infected twigs, a reddish-brown discoloration is present. This discoloration extends in to the woody tissue and could show up on one particular side in the stem. Twig blight is normally far more extreme following your azalea is stressed by heat or drought. Manage of twig blight is accomplished by pruning and disposing of diseased branches. As you prune, eliminate all the infected tissue by producing your cuts beneath the discoloration. In line with North Carolina State University, fungicides do not offer powerful manage of twig blight.

Powdery Mildew


Powdery mildew (Oidium sp.) seems as a white powdery development around the leaves of the azalea. This development is generally noticed inside the fall, especially right after a dry summer season. The infected leaves may possibly turn yellow and occasionally blacken. Despite the fact that leaves might drop, powdery mildew is seldom fatal. Avert the spread of powdery mildew by pruning and thinning your azalea to make sure there's sufficient air circulation and light penetration. Chemical manage is hardly ever needed, but if powdery mildew is widespread within your landscape, applications of horticultural oil may possibly give some manage by stopping infection in wholesome plants. In accordance with the University of California, fungicides containing myclobutanil or sulfur may possibly also offer handle.

Leaf Rust


Leaf rust is brought on by the fungus Pucciniastrum vaccinii. Symptoms 1st show in mid-summer as round yellow flecks around the upper leaf surface. Around the underside in the leaves, rust-colored pustules that include spores create. These spores are carried to new leaves by the wind. When the leaves stay wet overnight, new pustules kind, repeating the life cycle in the fungus. Leaf rust may cause substantial defoliation of infected leaves, but handle might be accomplished by removing fallen leaves that harbor the fungus more than the winter. In most instances, leaf rust isn't fatal to healthier azaleas, and chemical handle isn't required.

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