An earwig feeding on dahlia leaves. Dahlia: Leaves have lost green color. Leaves may be distorted. Google "dahlia disease photos" or something like that. Shortening of internodes (stunt) occurs in some cultivars. The browning and damage appear at the bottom leaves, and as time goes on, they will work their way up the plant. Discussion in 'Plant Pests, Diseases and Weeds' started by Nadea, Apr 2, 2015. I have noticed the leaves on several of my dahlia stalks are turning yellow from the bottom up. Spider mites also pose a threat to dahlias; these insects create a delicate web on plant foliage and small dots on leaf surfaces; leaves eventually turn a bronze color. Botrytis (cinerea) – commonly called Botrytis blight or gray mold first appears as a fuzzy white growth on the plant, but quickly darkens to a gray color. It is one of the few sites that has photos of the various viruses that can affect dahlias; but it may be nutritional problems causing the yellowing … Bands adjacent to the veins remain pale green (vein-clearing). Spider mites attach to the back side of the leaves and feed off the sap from the veins. To combat such infestation, which will diminish dahlia health, give your plants a "forceful spray" with water or soapy water up to 4 times a week or locate an appropriate miticide. Find out what causes dahlia leaves to turn yellow here and save your plant from foliar distress. Can you advise what may be causing this problem? However I could be wrong, as I am no where near as experienced as some of the other members over here. Infested dahlia leaves are covered with a white or ash-gray powdery mold. Earwigs. Often there is yellowing of leaves between the veins or along the margins (frequently mistaken for virus). Yellowing leaves are usually related to temperatures that are too cold, but occasionally, temperatures that are too hot can cause your plant to become dry and yellowed-looking, too. A. Jul 21, 2015 - Yellowing dahlia plants are common and may be caused by disease, insect infestation, improper or poor soil, or general site conditions. Dahlia mosaic virus - The normal green color of leaves develops irregularly. Curled leaves on dahlias Asked August 13, 2015, 10:14 AM EDT a few of our dahlias are exhibiting curling of new growth leaves accompanied by slight yellowing of the leaf. Q. Dahlia Leaves Turning Yellow. Answered by Nikki on July 30, 2011 Certified Expert . Powdery mildews thrive in both very humid and very dry weather. Badly infected leaves become discolored and distorted, then drop off. Keep an eye on the temperature, and if it seems like your plant is getting dried out, consider misting it to boost the humidity. Lower stems have sunken lesions. 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