Question From: K. WOOD - ALASKA . Mosaic virus in dahlias cause large scale disfigurement of the plant. Ask Nancy > Dahlia Leaves Are Curling. Other possibilities and solutions? It is common to find new leaves completely chewed, lacy and barely still there. It can also occur from water stress (too much or too little), nutrient deficiency, Here is a link to Growing Dahlias a publication from Iowa State University Extension. Looks like the start of a spider mite infestation. The culprits are usually caterpillars or some form of larvae. Viruses cannot be controlled with pesticides. But this year I've got a problem with one of them. I can see no evidence of aphid activity. The curling back of the leaves is the earliest sign of mites. Dahlia Mosaic Symptoms. Hand picking may be the solution to beating these types of problems with dahlia. I have watered. You’re wondering if it’s missing some type of nutrient, but nothing seems to help. Viruses cannot be controlled with insecticides. The quote below is taken from that publication. Once you see the webs, the population of mites are so high that you'll have a VERY hard time getting rid of them... so there is hope if you move quickly. Yardner's Advisor Newsletter provides information just for plants in your yard! I have no idea what could cause this? As you can see on the picture below, the leaves are curled at the moment. Leaves with numerous pale spots = Smut Leaves with white dust like covering = Powdery Mildew Leaves variously crumpled with irregular, pale yellowish patterns with insects visible more so with a magnifying glass = Red Spider Leaves variously crumpled with irregular, pale yellowish patterns with no insects visible with a magnifying glass = Virus Leaves wilt; stem interior with brown or black streaks = Wilt … Dahlia Leaves Are Curling. a few of our dahlias are exhibiting curling of new growth leaves accompanied by slight yellowing of the leaf. Do not add infected plants to compost pile. If it's the older leaves with the damage, but the new leaves are healthy, then the plant should recover. This leaf curling can also occur from water stress (too much or too little) or a nutrient deficiency. Remove infected plants and discard away from the site. Just keep an eye on them and watch for additional infestations. You can also remove those leaves and dispose of them in the trash. Dahlia Leaves Are Curling And No Bugs Have Been Detected; Some Dahlia Shoots Are Green But Very Short; Potted Dahlia Blooms Turn Brown And Dry Up In A Day Or Two; Dahlia Leaves Are Lighter Green Than Normal; Why Did Just One Dahlia Tuber Bulb Become Rotten And Have Little White Flies In The Soil; Dahlia Leaves Are Curling; Dahlia Has Not Sprouted Leaves Its growth is stunted and the leaves are blotchy and twisted. Yellowing and leaf curl can mean the presence of a virus. Your dahlia is clearly not doing well. A virus? Q: I'M IN ALASKA, WE START OUR DAHLIA 'S INDOORS, AS OUR LAST FROST IS LATE! Ask A Question; Search Our Site. Newsletter Subscription. Questions. Plants may show a variety of leaf mottling patterns, necrotic and ring spots, and bubbling or distorted leaves, stem streaking, stunting, and wilting. MY DAHLIAS HAVE COME UP JUST FINE, UNTIL A FEW … Here is a link to a previous post that might also help. It can also occur from water stress (too much or too little), nutrient deficiency, Here is a link to Growing Dahlias a publication from Iowa State University Extension. This leaf curling can also occur from water stress (too much or too little) or a nutrient deficiency. If so you can spray with water. The quote below is taken from that publication.Virus—Diagnosing a virus problem is often misleading if based on symptoms alone. Sadly, you may be witnessing mosaic virus in dahlias. None of my other dahlias seem to have this problem at the moment. I started tubers indoors, green stalk is thick 5 inches tall but green leaves are curling under. 777 Lawrence Avenue East Toronto, ON, Canada M3C 1P2 | Phone: 416-397-1345, Copyright © Toronto Master Gardeners 2019, Gardening Guides provide introductory information on a broad range of horticultural topics. These feed on leaf tissue and make Swiss cheese of the foliage, diminishing the plant’s ability to intake solar energy. Also the lower leaves are starting to yellow a little bit. Have you checked for pest activity, are the leaves sticky? Ask an Expert is made up of groups and individual experts. Viruses cannot be controlled with insecticides. Yellowing and leaf curl can mean the presence of a virus. It's not unusual for older leaves to show curling, browning or yellowing as they age. It could also be a virus, which can be more difficult to diagnose. This could be an indication of some kind of pest activity, aphids for example. Infected plants also can be carriers without showing any symptoms. It could also be a virus, which can be more difficult to diagnose. For the last few years, I'm growing some dahlias.