Leaves roll and droop; no insects evident: Water stress Canker Root problems: II. Repeat application every 10 days until control is obtained. Why? A while back, I noticed that two bushes adjacent to each other had some yellow leaves, but I didn't think much of it. I planted azaleas two springs ago. Stunt Nematode – These azalea pests attack the feeder roots and cause azalea plants to become stunted and yellow. This symptom tells me that the root system is impaired or there is a marked pH difference on that side of the plant. Q. Azalea With Yellow Leaves - My azalea has been extremely healthy all summer but now has lots of leaves turning yellow and falling off. There could be several reasons for those azaleas turning yellow. Chlorosis Azalea leaves and flowers tend to wilt for three reasons: Azaleas have shallow roots which leaves them vulnerable to drought which results in wilted leaves and flowers. Q. Azalea Spotting - I planted 5 gallon-sized azaleas last spring. Now, they're both almost completely yellow… Most garden plants will require a pH of 6.5 - 7 for strong healthy growth which is just on the acid side of neutral pH is the measured alkalinity or acidity of a soil. How much should I use to increase the soil’s acidity? A: “Yellow leaves” on azaleas is a common problem. Azaleas are a joy to see in any garden, but have you ever encountered the frustrating problem of the leaves turning pale green to yellow. Soil that drains too slowly, or is naturally boggy will cause the azalea to have root rot. Right before the leaves fall off the plant, they will turn yellow. Leaves thickened or fleshy, turn pale green or whitish: Leaf and flower gall (Exobasidium) 2. I am using a powdered, water soluble fertilizer product that says it acidifies the soil and adds iron to the soil. If you have been experiencing very dry weather, this has encouraged the azalea to shed its oldest leaves. Branches and Twigs Affected: A. Terminal buds and leaves turn brown: 1. What's wrong with my azaleas? The undersides of the leaves become discolored by excrement and cast skins. There could be several reasons for those azaleas turning yellow. The yellow leaves on your azalea are concentrated in one part of the plant while the rest of the shrub looks green and healthy. Leaves eaten or chewed at margins in half-circle pattern: Black vine weevil: D. Leaves distorted: 1. Azalea leaves naturally turn these colors before they fall. The first year the leaves were dark green, but last year they started to turn yellow shortly after flowering. Too much sun dries out the soil and can burn the tender leaves of the azalea. Affected leaves may also curl up and drop. Would a soil pH problem cause this? Q. Azaleas With Yellow Leaves - I planted 13 azaleas in my front yard about 5 months ago and now the leaves are turning yellow. Azalea Leafminers – This azalea plant pest generally “mines” between the upper and lower surfaces of leaves causing brown blisters or yellowing on the leaves. Azalea lacebug Upper surface of leaves has a gray, blanched, or coarse-stippled appearance. Q: The leaves on my azalea are turning yellow. Removal of affected plants may be necessary. Other signs that your plant is not getting enough water are leaves that are curling inward, drooping down, … Many who have ever grown Azaleas will know that they like an acid pH. HELP!! If your plant is dry – you can stick your finger into the soil to check it – try to get it on a regular watering schedule. This process duplicates the coloration normally seen later in the year. Leaves. Spray undersides of the leaves with Malathion, dimethoate (Cygon), or acephate (Orthene).