Repeat application every 10 days until control is obtained. Azalea Leafminers – This azalea plant pest generally “mines” between the upper and lower surfaces of leaves causing brown blisters or yellowing on the leaves. 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. The yellow leaves on your azalea are concentrated in one part of the plant while the rest of the shrub looks green and healthy. Q: The leaves on my azalea are turning yellow. 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. Chlorosis Leaves. Branches and Twigs Affected: A. Terminal buds and leaves turn brown: 1. What's wrong with my azaleas? Why? 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. Q. Azalea With Yellow Leaves - My azalea has been extremely healthy all summer but now has lots of leaves turning yellow and falling off. Q. Azaleas With Yellow Leaves - I planted 13 azaleas in my front yard about 5 months ago and now the leaves are turning yellow. If you have been experiencing very dry weather, this has encouraged the azalea to shed its oldest leaves. There could be several reasons for those azaleas turning yellow. Leaves thickened or fleshy, turn pale green or whitish: Leaf and flower gall (Exobasidium) 2. Would a soil pH problem cause this? I am using a powdered, water soluble fertilizer product that says it acidifies the soil and adds iron to the soil. 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 Spotting - I planted 5 gallon-sized azaleas last spring. Leaves roll and droop; no insects evident: Water stress Canker Root problems: II. Spray undersides of the leaves with Malathion, dimethoate (Cygon), or acephate (Orthene). Stunt Nematode – These azalea pests attack the feeder roots and cause azalea plants to become stunted and yellow. There could be several reasons for those azaleas turning yellow. Right before the leaves fall off the plant, they will turn yellow. How much should I use to increase the soil’s acidity? 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. I planted azaleas two springs ago. The undersides of the leaves become discolored by excrement and cast skins. HELP!! Too much sun dries out the soil and can burn the tender leaves of the azalea. A while back, I noticed that two bushes adjacent to each other had some yellow leaves, but I didn't think much of it. A: “Yellow leaves” on azaleas is a common problem. Removal of affected plants may be necessary. 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