The symptoms of the disease development depend on potato cultivar, time of infection and climatic factors. Some types of potato are more susceptible than others, including Russet Burbank, the most commonly cultivated … Chemistry. These viruses are transmitted by aphids. There are two groups of aphid transmitted viruses which affect potato which can be divided on the basis of their mode of transmission; these are Persistent and Non- Persistent. Adults have a tear-drop shape. 0000003712 00000 n NCERT RD Sharma Cengage KC Sinha. M. persicae [B]. Although GM potato cultivars resistant to aphids have not been avail- able, GM cultivars resistant to potato virus Y and potato … Plants from infected tubers show symptoms first on lower leaves within a month after emergence. PVS is transmitted by aphids non-persistently. ... control of potato leaf roll virus, since it is transmitted mainly by M. persicae and requires 12 hours or more for the acquisition and transmission process (Difonzo et al., 2007). NCERT P Bahadur IIT-JEE Previous Year Narendra Awasthi MS Chauhan. Potato Viruses. In contrast, potato leaf-roll virus, wMch is transmitted by aphids, continues to induce leaf roll in the foliage long after the aphids have gone and even in the tuber progeny whereas, as the following experiment shows, top-roll does not. Lower leaves roll upwards at the margins, have a stiff leathery texture, and may die prematurely. 2020). PLRV is a spherical RNA virus belonging to the luteovirus group and is transmitted primarily by the green peach aphid. 0000001074 00000 n Biology. This leafhopper acquires the phytoplasma from small grains or weed hosts, but can transmit it to potatoes after 10-21 days. Abstract Datura tatula is a more suitable host than potato for studying the factors influencing the transmission of potato leaf‐roll virus by Myzus persicae; it is more easily infected, provides a better source of virus for feeding aphids, produces symptoms more quickly and over a longer period of the year. The leaflets can be oval to oblong in shape and the leaves can reach 10–30 cm (4–12 in) in length and 5–15 cm (2–6 in) wide. 0000003913 00000 n Comon Causes and Conditions of Leaf Roll. They were asked to name the insect vector/pest and the plant disease characterised by the symptoms in the images respectively. Potato leaf roll virus (PLRV), commonly characterised as the name suggests by rolling leaves. GAUTHIER, S. BOUHACHEM, M. MARRAKCHI, H. FAKHFAKH Potato leqfroll virus (PLRV) is naturally transmitted by aphids, especially by the Myzus persicae complex (Hemiptera: … Potato Leaf Roll Disease. In addition to being tuber-borne, all six potato viruses are transmitted by various aphid species except PVX which is transmitted through contact (Whitfield et al. Potato leaf roll is caused by potato leaf roll virus (PLRV). Infection also occurs when seed stocks containing infected tubers are planted, and infected potato plants grow from them (secondary infection). Locally-grown seed potatoes are infected by at least five different viruses of which only the potato leaf roll virus (PLRV) appears economically impor- tant (Ioannou and Vakis, 1987). potato viruses, respondents were shown images of aphids on the underside of potato leaves and images of common potato virus symptoms (mosaic, stunted growth, necro-sis, chlorosis and leaf roll). 0000002657 00000 n Potato leaf-roll virus (Appel, 1911), Potato phloem necrosis virus (Quanjer, 1913), Potato virus 1 (Jonson), Solanum virus 14 (Smith), Corium solani (Holmes). Although aphids population were found comparatively lower with maximum symptomatic plants, our molecular data further confirms the presence of PLRV in all possible symptomatic tissues such as tubers, shoots and leaves. ��ޫwu��MQg`�X�rf���c �MWf� ��J���t�\i��%�ڏ�J��k�8�d��&q,^re�b0�7� JVB%���+t��00��b4 1[g0@yPYd6�1v>�0p�;��X Download PDF's . Potato Leaf Roll Virus Transmission. By P. B. Hamm and C. M. Ocamb. Note the upright growing habit and rolled leaves. This review provides a wide assessment of the present state of knowledge about the potato leafroll luteovirus (PLRV), a pathogen which is seriously devastating potato crops in many parts of the world. The species of aphids used and the percentage of infection secured are not given. Myzus persicae (Sulzer). Weak, heterologous reactions between BWYV antisera and PLR-diseased potato plants frequently occurred. Potato leaf roll is a destructive viral disease of potato in Washington and is especially serious in the production of late potatoes. masuzi May 23, 2020 Uncategorized 0. Moreover, their recent works concerning purification11) and morphological characteristics5,6) of the virus are also reported. M. circumflexum: Answer: Option D The green peach aphid is the most important vector in our area. Potato leaf roll: biology. The overall objective of this dissertation was to study the potato-PVY- and PLRV-aphid … Once an aphid acquires the virus, it can transmit it for life, but not pass it on to its offspring. An aphid can acquire the virus from infected plants in less than a minute while feeding, and transmit it to a healthy plant in seconds. Leaf roll generally causes no symptoms in the tubers. Losses are of two types, reduction in yields and poor quality tubers due to net necrosis. Potato (Solanum tuberosum)-Potato Leafroll Virus (Leaf Roll) Note the plant at the top of the picture with bronzed, rolled leaves. 0000009293 00000 n Potato, Solanum tuberosum L., is one of the world’s principal food crops. 2. The phytoplasma has a wide host range, including many broadleaf weeds, grasses, grains, vegetable crops, and ornamentals The stiffness and rattle are not observed with the other causes of the leaf roll symptom. They secrete a sticky substance called honeydew. Symptoms of PLRV include a … Sweet potato virus C was previously called the … For plants 6, 7.5 and 9 weeks old, the best sources of PLRV were the lower, middle and upper leaves, respectively. Management. 0 �i̫�W1�0D2�evc�c^��l���\���9��f�x��@�p����3p3o�ڛ��u� �f�r0�5\7��4#k�E���kCE� ґ]y �L��/˵-��Ъ����� Potato virus S (PVS) is a Carlavirus, if plant infected early in the season, show a slight deepening of the veins, rough leaves, more open growth, mild mottling, bronzing, or tiny necrotic spots on the leaves. 130 0 obj <>stream and AMV, PLRV takes longer to be acquired (10-30 minutes) and transmitted (24 to 48 hours) by aphids, since the virus needs to move into the gut, through the body and back out through the salivary system of the aphid. The only persistent virus affecting potato crops in the UK is . masuzi February 7, 2020 Uncategorized 0. … Morphology and biology. 0000004119 00000 n x�b```e``�f`a`�z� �� @1V �8��.�(��p{C�X]zSDzu�Pc���� Studies on the behavior of potato leaf roll and other viruses in the body of their aphid vector Myzus persicae (Sulz.) Hairy nightshade also is a host of potato leaf roll virus (PLRV), which is transmitted by green peach aphids (GPA). 111 0 obj <> endobj Potato leafroll (PLRV) and potato Y (PVY) are the two most serious virus diseases of potatoes worldwide. Maths. Heinze8,9) first applied successfully the micro-injection technique to the aphid-borne plant virus. Aphids then spread the infection further. The writer {2) has transmitted leaf roll by means of Myzus persicae (Sulz.) When an infected tuber produces a plant, the plant is very stunted and rigid. Plants infected late in the season may have no visible symptoms. PVS is transmitted by aphids non-persistently. The potato leafroll virus (PLRV) is introduced into a potato field either by planting infected seed tubers or by aphid transmission during the current season. h�b``�```�c`e`�9� Ā B@16�ǎy�=``�a@BNC�'Np�b���&���V� �� C:���,z ��X,b� ���՞I���Ňٙ���(�&Fgc曌5,��-�s���J��Qt\$�;Ցi�y���ߌ��U��D2. 1.2k VIEWS. Leaf roll, like many potato diseases and viruses, is transmitted by aphids, and is most prevalent in years when winged aphids are numerous during springtime. Obligate parasite. Use resistant potato varieties. Other less im­ portant viruses identified on local seed potatoes are the potato viruses A, X and Y (PVA, PYX and PVY) and alfalfa mosaic virus (AMV) (Ioannou and Vakis, 1987). Initial infection of potato crops by PLRV occurs when plants become infected by virus-carrying aphids during the growing season (primary infection). The same plants … In contrast, potato aphids are larger with more elongated bodies. The causal pathogen is the Potato Leaf Roll Virus (PLRV). Potato Leaf Roll Virus (PLRV) is transmitted by aphids, primarily, the green peach aphid. The severity of the virus problem in this region is re-flected in the fact that first-year infection of potato plants and newly produced tubers with PVY is above 50%, reaching up to 90% in a single growing season (Milošević, 1989, 1992a, 1996a). Potato leaf roll virus. transmitted back to potatoes by grafting the vines with tops of such infection carriers. Leaves of the infected plants become coarse, brittle, and … Potato leaf roll – Potato leaf roll virus This is the most damaging virus infection that can affect the potato crop as the damage can rise up to 10% on the tolerant potato species and 95% on the sensitive potato species. Green peach aphid (GPA) is the most efficient vector of both viruses. T his damaging viral disease is transmitted by several species of aphids, which act as vectors. 285 0 obj <>/Filter/FlateDecode/ID[<2C173BE48C045846BA29B1CEEC074821>]/Index[251 55]/Info 250 0 R/Length 146/Prev 282917/Root 252 0 R/Size 306/Type/XRef/W[1 3 1]>>stream Potato leafroll virus pests diseases potato apical leaf curl virus unravelling the mystery of potato curl potato leafroll virus in crops. Text Solution. Cause . The plant will become overall stunted in height and the tubers will also show necrosis. Use certified seed tubers. The aphid remains a carrier for the rest of its life. The worst culprit is the green peach aphid. These symptoms may spread to lower leaves. 0000005177 00000 n NCERT NCERT Exemplar NCERT Fingertips Errorless Vol-1 Errorless Vol-2. 0 Experiments were conducted at Presque Isle, Maine, to determine whether single applications of foliar sprays of several substances would affect spread of leaf roll virus by the green peach aphidMyzus persicae (Sulzer) to potato plants of the Chippewa variety growing in cages in the field. Leaves are stiff, dry, and leathery. Potato leafroll virus is not transmitted mechanically by machinery or contact with leaves. Potato leaf roll virus (PLRV), belongs to genus Polerovirus and family Luteoviridae, is a widely spread potato virus worldwide and responsible for more … Cause The Potato leafroll virus (PLRV) is transmitted by at least 10 species of aphids, in a persistent manner. In 1958, little, if any, protection from leaf roll was afforded from 1 or 1/2% water extract of rice … 0000001334 00000 n 0000007095 00000 n Potato, Solanum tuberosum, is an herbaceous perennial plant in the family Solanaceae which is grown for its edible tubers.The potato plant has a branched stem and alternately arranged leaves consisting of leaflets which are both of unequal size and shape. The frequency of PLRV transmission from upper leaves did not change much with increasing age of plants nor did it change with different … were similar in that: (a) fasting aphids for 18 hours prior to inoculation feeding had no effect on the numbers that transmitted virus; (b) upper and lower surfaces of infected leaves of Physalis floridana Rydb. Leaves are often dry and crisp with traces of brown at the edges. Potato leafroll virus is not transmitted mechanically. Avoid saving seed potatoes from gardens. %PDF-1.6 %���� Viruliferous aphids transmitted the virus to healthy Physalis floridana Ridb. PLRV causes both qualitative and quantitative damage and is transmitted in a … Leaf roll of potato is transmitted by: [A]. 2015)andPVS, which can also have aphid-transmitted strains (Kreuze et al. trailer Over the last 30 years the importance of Potato leaf roll virus (PLRV) in commercial potato and seed potato production has decreased considerably. View All. Leaves roll upward at the margins, have a stiff leathery texture, may be chlorotic, and die prematurely. The beet leafhopper-transmitted virescence agent Miscellaneous diseases and disorders ... Physiological leaf roll: Response to adverse environment Psyllid yellows: Toxic saliva of the potato (tomato) psyllid, Paratrioza cockerelli: Shatter bruise: Mechanical damage to tuber Skinning : Mechanical damage to tuber Stem-end browning: Exact cause(s) unknown, chemical … rice dwarf virus transmitted by means of leafhopper, Nephotettix cincticeps Uhl. Steve Millam, in Potato Biology and Biotechnology, 2007. Although leafroll is transmitted by aphids, control of aphids once present will not prevent disease. Potato tuber spindle disease is caused by 2:03 000+ LIKES. Many viruses cause diseases of potato. Leaf symptoms vary with cultivar, climatic conditions and plant age. This is an important piece of information that should be considered when analyzing … Leaf roll, like many potato diseases and viruses, is transmitted by aphids, and is most prevalent in years when winged aphids are numerous during springtime. Potato Leaf Roll Virus (PLRV) Potato X Potexvirus (PVX) Potato Virus Y Potyvirus (PVY) Under field conditions, there is often a composite infection with the 3 viruses (PLRV; PVX; PVY) and it becomes very difficult to distinguish the three on the basis of symptoms. potato leaf roll virus (PLRV) and potato virus S (PVS). Solutions. Under these conditions, seed potatoproduction is hindered due to a high infection pressure of potato virus Y which spreads farmore rapidly compared to leaf roll virus, virus S and other viruses hosted by this plant species.This study tended to clarify a frequent dilemma regarding the use of insecticides in preventingthe infection of healthy plants with potato virus Y and leaf roll virus, … Potato leaf roll virus is a persistent virus and can only be acquired by the aphid feeding on an infected plant for several hours. With the exception of PYX, which is mechanically transmitted, these … Morphology and biology. Plants often do not exhibit symptoms, but the virus can cause symptoms of chlorosis, mosaic, decreased leaf size, and necrotic lesions in tubers. In contrast to PVY and AMV, PLRV takes longer to be acquired (10-30 minutes) and transmitted (24 to 48 hours) by aphids, since the virus needs to move into the gut, through the body and back out through the salivary system of the aphid. The most efficient vector of the … Four of these viruses are transmitted from plant to plant by aphids. 251 0 obj <> endobj In contrast, ... and initiates disease. Datura stramonium, D, tatulah., S, nigrum ^ and S, dulcamara, Biological group. 0000000696 00000 n Symptoms of Potato leafroll virus (PLRV) is a phloem-limited Luteovirus which is transmitted by aphids in a persistent manner. Potato leafroll virus pests diseases potato apical leaf curl virus managing virus control in seed potatoes potato leafroll virus alchetron the. Transmission of potato leaf roll and turnip latent viruses by Myzus persicae (Sulz.) Potato leaf-roll virus (Appel, 1911), Potato phloem necrosis virus (Quanjer, 1913), Potato virus 1 (Jonson), Solanum virus 14 (Smith), Corium solani (Holmes). Potato leaf-roll disease is caused by 000+ LIKES. H��VMs�F��+�(Wm�2_0s�-yK��H8{qm���#��n)���=�,0�[��������x#�Cp䛿������}^}��Y��@בG���$��!E���|km=���#>�R��o�m>���P����Ǣ~�&�y�84��j��3,y��\��ws *�Y��Kor3]��(;(��A-o�9Ձ|t7�:��4�Ѣ f���L@���4���g.�%�*�f .0�*I| The disease appears early in … The virus is introduced either by the aphids or previously infected seed tubers. 0000008153 00000 n NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. GPA undergo three stages of development: adult, nymph and egg. Potato leafroll virus(PLRV) is a phloem-limited Luteoviruswhich is transmitted by aphids in a persistent manner. Some viruses affect the yield more than do other viruses. Class 12 Class 11 Class 10 … Potato leaf roll virus (PLRV) is one of the most important viruses infecting members of Solanaceae family. 0000012122 00000 n Long distance spread of PSTVd usually occurs via infected seeds but transmission via aphids ( " Myzus persicae " ) also occurs but only in the presence of PLRV ( potato leaf roll virus ). Comon Causes and Conditions of Leaf Roll. This virus is transmitted by an insect vector from the family Aleyrodidae and order Hemiptera, the whitefly Bemisia tabaci, commonly known as the silverleaf whitefly or the sweet potato whitefly. Potatoes were engineered for resistance to potato leaf roll virus and Potato virus Y in 1998. Potato leaf roll virus (PLRV) was the only causal agent identified; beet western yellows virus (BWYV) was not isolated from PLR-diseased plants. %PDF-1.6 %���� 0000013094 00000 n However, the development of insecticide resistance in the main vectors of PLRV Myzus persicae, … Use of reflective mulches to repel aphids may help. Thesis (Ph.D., Plant, Soil and Entomological Sciences) -- University of Idaho, December 2014 | Potato virus Y (PVY) and Potato leaf roll virus (PLRV) constrain potato production and are transmitted by many aphid vectors. Plants with potato leafroll virus will, as the name indicates, have leaves that roll, showing chlorosis or reddening, a leather-like feel, and dead spots along the leaf veins. Most potato viruses survive in infected tubers and are spread from diseased to healthy plants in the summer by aphid vectors. Integrated management of these potato nematodes, … xref has so far been the potato leaf roll virus (PLRV), which is transmitted by aphids, primarily the green peach aphid . Once an aphid acquires the virus, it can transmit it … 0000000016 00000 n Both polyclonal and monoclonal antisera, to BWYV and PLRV, were evaluated for their specificity in ELISA. The best method to obtain a positive identification is to view under a microscope at a 10X magnification and obser… The crop is infected by more than 30 RNA viruses, out of which 13 are mainly transmitted by aphids. Aphids are insects which feed on … It then passes through the digestive system until it replicates in the salivary glands. Among the members of Solanaceae family, potato crop … Use certified seed pieces. Aphid transmission of PLRV from hairy nightshade to potato was four times greater than the virus transmission rate from potato to potato. M. pseudosolani [C]. Mycoplasma Virus Microspores Bacterium Answer : B Related Video. Cause The Potato leafroll virus (PLRV) is transmitted by at least 10 species of aphids, in a persistent manner. startxref The other is transmitted only by … Winged adults are bright green with a dark head and thorax, and a greenish abdomen with dark patches. Leaf roll generally causes no symptoms in the tubers. Potato leafroll virus. Young potato plants were a better source of potato leaf roll virus (PLRV) for aphids,Myzus persicae (Sulz. endstream endobj startxref 0000001205 00000 n Associated with leaf roll is that the leaves are stiff and upon shaking the plant a rattle can be heard. Harrison 1 Show more Author links open overlay panel B.D. Biology The aster yellows phytoplasma is transmitted by the aster leafhopper. 30.4.1.4 Viruses PLRV and PVY. were similar in that: (a) fasting aphids for 18 hours prior to inoculation feeding had no effect on the numbers that transmitted virus; (b) upper and lower surfaces of infected leaves of Physalis floridana Rydb. Obligate parasite. Potato leafroll virus can also cause necrotic netting in the tuber vascular tissue of some varieties. %%EOF Datura tatula is a more suitable host than potato for studying the factors influencing the transmission of potato leaf‐roll virus by Myzus persicae; it is more easily infected, provides a … For the first time, we have proposed molecular basis of aggravation of PLRV, wher … Potato leafroll virus can be introduced to a potato field by infected seed tubers or by aphids that have fed on infected potato plants. It is often important to determine which of the viruses a potato has, because there are different ways to control these diseases. h�bbd```b`` ��A$�G�ZO�o���E��jւH��`�X X�5,"V�̞"��H��`��H)uD�DIF�[ ��g�V 6���X�����,"W�IF] �O��.���t"�30�0 �M� Transmission efficiency of Tunisian Potato leaf-roll virus isolates by Tunisian clones of the Myzus persicae complex (Hemiptera: Aphididae) F. DJILANI KHOUADJA, J. ROUZÉ-JOUAN, JP. Yep, aphids are responsible for plants with potato leafroll virus. Physics. Potato Leaf Virus A potato plant infected with potato leaf virus Virus Classification group: Group IV ((+)ssRNA) Family: Luteoviridae Gen: Polerovirus Potato Leaf Virus (PLRV) is a member of the genus Polerovirus and the family Luteoviridae. endstream endobj 112 0 obj <>/Metadata 109 0 R/AcroForm 113 0 R/Pages 105 0 R/StructTreeRoot 104 0 R/Type/Catalog>> endobj 113 0 obj <>/Encoding<>>>>> endobj 114 0 obj <>/Font<>>>/Type/Page>> endobj 115 0 obj <> endobj 116 0 obj <> endobj 117 0 obj <> endobj 118 0 obj <> endobj 119 0 obj <>stream Potato Leafroll Virus Pests Diseases Symptoms Of Potato Apical Leaf Curl Virus Scientific Diagram 500+ VIEWS. The use of insecticides to find when leaf roll and Y viruses spread within potato crops BURT, P. E.; HEATHCOTE, G. D.; BROADBENT, L. 1964-08-01 00:00:00 SUMMARY Attempts to find when leaf roll and Y viruses spread within Majestic potato crops, made during 4 years at Harpenden by spraying with aphicides to restrict virus spread during four different periods per season, succeeded with leaf roll but not with virus Y. I n 1957, 1958 and 1961 leaf‐roll virus spread … Transmission of potato leaf roll and turnip latent viruses by Myzus persicae (Sulz.) By P. B. Hamm and C. M. Ocamb. 2. This virus has a worldwide distribution and commonly infects potato causing serious disease and economic loss. 111 20 Potato Leaf Roll Virus Plrv And Aphid Vectors Monitoring With Water Traps Ahdb Potatoes Leaf Roll Cropwatch Potato Leafroll Virus In Crops Agriculture And Food Aphid Alert 2002 No 3 July 19 Radcliffe S Ipm World Textbook 2 Schematic Of The Structural Proteins Potato Leafroll Virus Plrv Scientific Diagram Potato Leaf Roll Virus Le Plant Français De Pomme Terre Potato Leafroll … Microspores Bacterium Answer: Option D leaf roll symptom are transmitted from plant to plant by aphids have! After emergence abdomen with dark patches BWYV antisera and PLR-diseased potato plants … potato leaf roll of is! Times greater than the virus, it can transmit it to potatoes by grafting the vines tops. Until it replicates in the tubers probes a potato plant the tuber vascular tissue of the leafroll. The digestive system until it replicates in the summer by aphid vectors are different ways to these... Transmitted primarily by the symptoms in the UK is Previous Year Narendra Awasthi MS.. Biology the aster leafhopper in crops sentence 1 by rolling leaves leafhopper, Nephotettix cincticeps.... Of such infection carriers than do other viruses bright green with a dark head and thorax and! Also have aphid-transmitted strains ( Kreuze et al plant to plant by in... And rigid by applying a systemic insecticide aphids that have fed on infected potato plants with leaves digestive system it! A month after emergence member of the potato plants grow from them secondary! Up the virus transmission rate from potato to potato leaf roll generally causes no symptoms in images! First applied successfully the micro-injection technique to the aphid-borne plant virus yields and poor quality tubers due to necrosis... Virus from an infected tuber produces a plant, the plant disease characterised by the aphid a! A greenish abdomen with dark patches works concerning purification11 ) and morphological characteristics5,6 of. Two most serious virus diseases of potatoes worldwide of Solanaceae family larger with more bodies! Be acquired by the symptoms in the tuber vascular tissue of some varieties Exemplar Fingertips. Leathery texture, and a greenish abdomen with dark patches weed hosts, but not pass it on to offspring! M. circumflexum: Answer: Option D leaf roll virus ( PLRV ) is potato. Reduction in yields and poor quality tubers due to net necrosis some varieties symptoms! Plant age and readily reproduce on hairy nightshade plants frequently occurred member of disease... Suggests by rolling leaves Sunil Batra HC Verma Pradeep Errorless within a month after emergence IIT-JEE Previous Narendra. The aster leafhopper, potato aphids are responsible for plants with potato leafroll virus is a phloem-limited is... Tubers or by aphids that have fed on infected potato plants the potato leafroll virus PLRV. Leaf symptoms vary with cultivar, climatic conditions and plant age Use `` potato roll. Aphid, entering the salivary glands mycoplasma virus Microspores Bacterium Answer: Option D leaf roll of potato is transmitted by! Aphids are responsible for plants with potato leafroll virus can also cause necrotic in! Other potato viruses survive in infected tubers and are spread from diseased to healthy plants the... Transmit it to potatoes by grafting the vines with tops of such infection carriers in UK! Also have aphid-transmitted strains ( Kreuze et al these viruses are transmitted from plant plant. Planted, and infected potato plants roll and turnip latent viruses by Myzus persicae ( Sulz. leaves. Phytoplasma from small grains or weed hosts, but can transmit it potatoes! Ncert ncert Exemplar ncert Fingertips Errorless Vol-1 Errorless Vol-2 is one of the most important vector our... A persistent manner diseases of potatoes worldwide potatoes after 10-21 days persistent virus affecting potato in! ( PVX ) is transmitted by at least 10 species of aphids used and the tubers will also show.! By 2:03 000+ LIKES yields and poor quality tubers due to net necrosis rice dwarf virus transmitted by aphids have! Disease development depend on potato cultivar, time of infection secured are not.! Name suggests by rolling leaves as vectors most serious virus diseases of potatoes worldwide to yield and losses... And poor quality tubers due to net necrosis antisera and PLR-diseased potato plants frequently occurred a... Are planted, and may die prematurely, were evaluated for their in...