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One of the most difficult to diagnose of plant diseases are viruses. And there are many viruses around these days to infect your favourite plants. Some viruses come from unrelated species and some develop within the species. But, the reality is there are viruses all over the place which can infect your plants at any time, regardless of your attempts to prevent it. Plants can get viruses from pests, air, passage of fluids, and even you. In order to diagnose a virus in your plants is to know the symptoms. Curling of the leaves, twisting of the leaves, and spotted yellowing are common symptoms. However, don't worry too much. Your plants being infected does not necessarily mean that your yield will be bad. If you make life perfect for your plants, you can ensure to still get a good yield. The Garden Sage David Robinson has been in the hydroponics industry for over 20 years. Learn from his expert advice on how to really grow your plants using techniques perfected by the hydroponics industry. http://www.mygreenplanet.com