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Symptoms on Tomato Leaf. Photograph provided by Elizabeth Bush, Virginia Polytechnic Institute and State University. The tomato leaf mold fungus is a specific pathogen that only infects tomatoes, mainly in greenhouses. The symptoms of this disease commonly occurs on foliage, and it develops on both sides of the leaf on the adaxial and abaxial ...
Tomato pseudo-curly top virus: Tomato bushy stunt Tomato bushy stunt virus: Tomato etch Tobacco etch virus: Tomato fern leaf Cucumber mosaic virus: Tomato mosaic Tomato mosaic virus Tomato mottle Tomato mottle geminivirus: Tomato necrosis Alfalfa mosaic virus: Tomato spotted wilt Tomato spotted wilt virus: Tomato yellow leaf curl
The plant pathogen causes a yellow leaf disorder in solanaceous crops including tomatoes. [1] ToCV is transmissible by whiteflies, phloem-limited and causes symptoms of interveinal chlorosis followed by necrosis in the tomato plants leaves resulting in a reduced fruit yield. [1] ToCV has a wide range of hosts such as pepper and potato. [4]
Symptoms of TYLCV infection include severe stunting, reduction of leaf size, upward cupping/curling of leaves, chlorosis on leaves and flowers, and reduction of fruit production. This virus can cause significant yield losses from 90–100%, and it is estimated that about 7 million hectares can experience TYLCV infection or mixed virus ...
Potato virus Y genus Potyvirus, Potato virus Y (PVY) Sinaloa tomato leaf curl genus Begomovirus, Sinaloa tomato leaf curl virus (TCLV) Tobacco etch genus Potyvirus, Tobacco etch virus (TEV) Tobacco mosaic and Tomato mosaic genus Tobamovirus, Tobacco mosaic virus (TMV) and Tomato mosaic virus (ToMV) Tomato spotted wilt
Septoria lycopersici infects the tomato leaves via the stomata and also by direct penetration of epidermal cells. [3] Symptoms generally include circular or angular lesions most commonly found on the older, lower leaves of the plant. [1] The lesions are generally 2–5 mm in diameter and have a greyish center with brown margins.
Leaf spots are visible symptoms of virus infections on plants, and are referred to as systemic symptoms. [7] In systematic virus infections leaf spots caused by viruses show a loss of green colour in leaves, due to chlorosis which is a repression of chlorophyll development. [1]
Plant diseases are diseases in plants caused by pathogens (infectious organisms) and environmental conditions (physiological factors). [1] Organisms that cause infectious disease include fungi , oomycetes , bacteria , viruses , viroids , virus -like organisms, phytoplasmas , protozoa , nematodes and parasitic plants . [ 2 ]