UC IPM Online. The virus belongs to genus Polerovirus (derived from Potato leaf roll) in the family Luteoviridae. Net potato necrosis is the result of infection with potato leaf leaf virus (PLRV). All tubers produced from an infected plant will carry the virus, so when they sprout the plant is already infected and can act as a virus source to neighbouring plants. Potato leaf roll is caused by potato leaf roll virus (PLRV). Potato leaf roll virus (PLRV) is a member of the genus Polerovirus and family Luteoviridae.The virus infects potatoes and is a particular problem in the Americas. Jayasinghe, Upali. Authors; Authors and affiliations; C. S. Tuthill; Phares Decker; Article. “ Potato Leafroll Virus.” Technical information Bulletin 22. Studies have shown a minimum of twelve hours is required for the virus to be transmissible by an aphid. Warm humid conditions are preferred, but aphids can thrive in a number of climates as long as it is not too hot and dry, as their soft bodies make them prone to desiccation. PLRV infects members of the family Solanaceae. (2011) “A non-structural, p17 protein of Potato leafroll virus co-localizes in plant phloem tissue with virus capsid protein” Phytopathology 101:6 p. S47. The leaves become roll upward and tubers become necrotic. This symptom is caused by the selective death and damage to cells in the vascular tissues of the tuber. [5], Because of the wide array of symptoms that occur in different hosts, diagnosis of PLRV must be done based on the infected species. In potatoes PLRV is diagnosed by stunting and leafroll. March 1998. Eid, S., Durrin, J.S., Nikolaeva, O.V. May 1941, Volume 18, Issue 5, pp 136–139 | Cite as. This usually appears as small brown spots scattered throughout the tissue. Indeterminate tomato varieties tend to exhibit physiological leaf roll more often than determinate tomato varieties. 400+ SHARES. [3] Symptoms include chlorosis, necrosis and leaf curling. The insecticide is the same chemical that is naturally produced by the bacteria Bacillus thuringiensis (Bt). However, even very small percentages of virus can be a problem if green peach aphids appear very early and in abundance. C. Virus D. Mycoplasm. (2008) "Aphid pest gets "egged"". The aphids transmit a Luteovirus into the vascular tissue of the potato plants. In the tropics, aphids persist year round but the efficiency of PLRV transmission is reduced at temperatures above 26 degrees Celsius. The fact that only specific cells within the tuber are affected by this problem while others remain normal causes the characteristic net symptom. Leaf rolling caused by blackleg or stem canker will usually have additional stem symptoms. Leaf roll of potato is caused by: [A]. It causes high yield losses and can be the most devastating virus of potato. It can be responsible for individual plant yield losses of over 50%. Agricultural Research. Karasev, A. It is also genetically engineered for resistance to Potato Leaf Roll Virus (PLRV). Highly infected seed lots are rejected and not used the next season. In Idaho, for instance, during the second field inspection the allowable amount of PLRV is only 0.05% for G4 seed, 0.01% for G3 and G2 and none at all allowed in nuclear and G1. Analyses of leaf tissues taken from plants grown in the greenhouse and field showed in general that phosphorus, calcium, and magnesium contents were appreciably reduced in plants having leaf roll. This is a common disease of potato occurring on the foliage at any stage of the growth and causes characteristic leaf spots and blight. From 2005 to 2015 the level of PLRV detected in the Generation 2 seed potato crops ranged from 0 to 0.5% of total potato plants tested. Next . Wales, S., Platt, H.W., Cattlin, N. (2008) Diseases, Pests and Disorders of Potatoes. "Potato Aphids" 2008. Infected tubers retain normal shape but experience necrosis of the vascular tissue. Potato leafroll virus (PLRV) is a member of the genus Polerovirus and family Luteoviridae. Figure 1 Potato leafroll virus symptoms include upward rolling of leaves, Figure 2 Potato leafroll virus causes stunted plants. “Potato Leafroll Virus.” Technical information Bulletin 22. International Potato Center, CIP, Lima, Peru. Diagnosis of other species mentioned previously is by the above-mentioned symptoms. Symptoms of secondary infection are visible on all leaves, with upward rolling of lower leaves, while young leaves are often upright and pale. This usually occurs as small brown spots scattered throughout the tissue. Seed certification programs allow only a very small level of PLRV in certified seed. Therefore, PLRV can be controlled effectively by reducing aphid populations. 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