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How to Identify Dahlia Viruses and Prevent Virus Infection from Destroying Your Plants

Dahlias provide a welcome splash of colour in your allotment or garden border, but frustratingly they can become infected with a number of different plant viruses. You can tell if your dahlia has a virus infection by looking at the symptoms on your dahlia plant. Dahlias which are infected with a virus often have yellow leaf veins or yellow mosaic, mottled, or circular markings on their leaves. Infected dahlias have distorted or twisted leaves, and the dahlia plants have stunted or poor growth. In this video I show you what dahlia virus infection looks like and I explain how to diagnose virus infection on your dahlias. Symptoms of dahlia viruses can be confused with other common dahlia problems such as nutrient deficiency and insect feeding damage from leafhoppers and thrips. I show you how to distinguish dahlia virus infection from nutrient deficiency and insect feeding damage on the leaves. I show you three different methods you can use to prevent dahlia viruses from spreading and killing your plants. By following these simple treatment strategies you can keep your dahlia plants healthy! If you want to identify exactly which virus is infecting your dahlia then you can buy test kits, but the control methods which I describe remain useful, no matter which virus your dahlia plant has. The most common dahlia viruses in the UK are Tobacco Streak Virus, Tomato Spotted Wilt Virus, Impatiens Necrotic Spot Virus, Cucumber Mosaic Virus. ⏱️Timestamps 00:31 Dahlia leaf colour - virus symptoms 01:15 Dahlia leaf shape - virus symptoms 02:09 Dahlia plant growth - virus symptoms 02:30 Virus infection vs Nutrient deficiency 03:06 Virus infection vs Insect damage 03:32 Common dahlia viruses and should you test for infection? 04:07 Remove virus infected Dahlias 05:30 How to prevent spread of Dahlia viruses 07:29 You now know about Dahlia viruses! 🔬 Science links: 1️⃣ Presentation of commonly seen viruses in dahlias in the US, Hanu R. Pappu (PDF): https://dahlia.org/wp-content/virusdo... 2️⃣Uneven distribution of dahlia virus in the plant makes careful sampling important for accurate use of test kits. Asano S, Hirayama Y, Matsushita Y. Distribution of Tomato spotted wilt virus in dahlia plants. Lett Appl Microbiol. 2017 Apr;64(4):297-303. doi: 10.1111/lam.12720. PMID: 28129432. https://academic.oup.com/lambio/artic... 3️⃣Dahlia virus testing: https://www.agdia.com/testing-service... 🎵Music attribution: "Divertissement - Pizzicato (from the ballet Sylvia)" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/b... "Brandenburg Concerto No. 4 in G, Movement I (Allegro), BWV 1049" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/b...