Banks and Slopes, Cottage/Informal, Beds and borders, Wallside and trellises. When new leaves emerge in the spring the rust … Do not let water accumulate on plants so leaves stay wet overnight. Spray the azalea bush with a fungicide containing sulphur, manxozeb or Bordeaux. High humidity and prolonged leaf wetness encourage these pathogens. AZALEA LEAFMINER Symptoms: Brown, blister-like mines on leaves. Avoid treating the azalea for rust without making sure it is infected. The Alabama Azalea grows in drier woodlands than most of our other native azaleas. Keep areas around plants free of fallen foliage. Normally the plant will go dormant and will drop all its leaves for several weeks in the winter. The spots are light to rusty-brown with a definite margin. Rhododendron 'Diamond Red' (Azalea 'Diamond Red') will reach a height of 0.6m and a spread of 0.6m after 5-10 years. Instead of pulling the leaves off use clippers or scissors. However, azaleas are susceptible to a variety of fungal diseases including leaf spot and rust. Leaf Rust. Noteworthy Characteristics. The spores from the pustules spread easily to other leaves on the shrub, especially in damp or wet conditions. Rust is common in the fall months. The leaves on azalea plants tend to be smaller by comparison. When buying plants look for those specifically mentioning mildew resistance. Azalea Care: Rust Treatment Home Guides SF Gate. The first signs of the disease include small yellow spots about 1/8 inch in diameter on the upper side of leaves. Suggested uses. This plant has purple triangular-shaped foliage, making it an ideal choice for containers, borders or as an indoor plant. Dark-brown, pimple-like fungal fruiting structures form within the spots. fungus or mold on azalea bushes. Bulbous growths that eventually brown and harden. Rust on azalea. Why Are the Leaves on My Begonia Wilting?→. Forward/Disclaimer. Small bright yellow spots is a symptom of azalea rust, a fungal disease. Its scientific name is Oxalis triangularis and it is a member of the Genus Oxalis. Should I treat the others before they go too? Here is a fact sheet from the University of Maryland about diseases and insects of azaleas and rhododendron. Ornamental rhododendrons such as the ones shown in most of my photos have large, oval leaves with a glossy dark or medium green upper surface and a dull, pale green lower surface. The wings are highly sculptured, giving them a lacy appearance. When cared for properly, the landscape plants liven up the garden for many years. You will also know if you have these azalea insect problems by looking at the underside of the leaves, where the azalea lace bug tends to be found. Symptoms of rust begin to appear during warmer months. It is found almost wherever azaleas are grown. The woody shrubs can live for many years and, in general, resist insects and most diseases. If the problem isn’t severe, prune off and destroy the affected leaves. Mites are another common foe of the azalea, and like their friends, … Avoid treating the azalea for rust without making sure it is infected. Leaf galls on most other plants in Indiana are due to insects. Belonging to the Rhododendron genus, azaleas are perennial bushes prized for their showy blooms that appear during spring. If there are just a few insects, remove by hand. However, the fungal disease rust can mar the appearance of deciduous azaleas and damage leaves. ; March 2001. There are a number of different Rhododendron diseases, with the most serious being root rot and dieback of the branches. Rust spores travel to other plants via air currents and water splashes. Further details on rust diseases The older one had been doing well until this year when the leaves developed rust spots and holes. Plants look thin and scraggly. 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