A. Earwigs. 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. Lower stems have sunken lesions. 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. Flower color is usually normal Badly infected leaves become discolored and distorted, then drop off. I have noticed the leaves on several of my dahlia stalks are turning yellow from the bottom up. Often there is yellowing of leaves between the veins or along the margins (frequently mistaken for virus). However I could be wrong, as I am no where near as experienced as some of the other members over here. ... All have relatively similar symptoms which may include yellow spots or mottling on the leaves, yellowing along the veins, shortened leaf nodes on stems, distorted or twisted foliage, shorter than normal … Jul 21, 2015 - Yellowing dahlia plants are common and may be caused by disease, insect infestation, improper or poor soil, or general site conditions. Find out what causes dahlia leaves to turn yellow here and save your plant from foliar distress. 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. Nadea New ... over here. An earwig feeding on dahlia leaves. Dahlia mosaic virus - The normal green color of leaves develops irregularly. Shortening of internodes (stunt) occurs in some cultivars. The plant will appear to be drying up, and the leaves will have brown edges and yellowing along the veins of the leaves (you may notice webbing too). Bands adjacent to the veins remain pale green (vein-clearing). Infested dahlia leaves are covered with a white or ash-gray powdery mold. The browning and damage appear at the bottom leaves, and as time goes on, they will work their way up the plant. Spider mites attach to the back side of the leaves and feed off the sap from the veins. Powdery mildews thrive in both very humid and very dry weather. 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. 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 … Discussion in 'Plant Pests, Diseases and Weeds' started by Nadea, Apr 2, 2015. Keep an eye on the temperature, and if it seems like your plant is getting dried out, consider misting it to boost the humidity. 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