Depending on the direction of the disease, these corky areas can end up covering the entire exterior of the potato by growing and merging together. The major loss from common scab … CS degrades the appearance of the potato tubers, thereby diminishing market value. It reduces crop value and, in extreme cases, yield (Hiltunen et al. In subcontinent the cultivation of potato started in 1900 (Malik, 1995). THE SYSTEMATIC POSITION OF THE ORGANISM OF THE COMMON POTATO SCAB. Request PDF | On Jan 1, 2003, Khurana SMP Patel RL Patel NH Chaudhri SM Patel RN published Management of common scab of potato | Find, read and cite all the research you need on ResearchGate 0000016234 00000 n 56 0 obj <>stream Common scab (CS) is an important disease and quality problem in potato crops worldwide. 2.2 Lesion types of common scab on BP1 potato tubers in South 17 Africa. 39, Issue 1003, pp. It has been reported on beet, mangel, turnip, rutabaga, radish, carrot, salsify, and parsnip. However, its appearance is undesirable and decreases the quality and value of the potato. Common scab of potato, a prevalent disease in potato-growing areas of the world, is caused by a variety of Streptomyces species. 0000001973 00000 n Potato is prone to many drastic diseases like potato common scab (CS). This potato blemish causes unwanted ugly, scabby lesions that spoil the appearance of the tuber and make them undesirable to consumers or difficult to process. %PDF-1.3 %���� The txtAB operon, responsible for thaxtomin production, can be used as a marker to identify pathogenic strains of the bacterium. trailer << /Size 61 /Info 16 0 R /Root 19 0 R /Prev 205891 /ID[<28bf4e5e4e758a4164004e56fffa0108>] >> startxref 0 %%EOF 19 0 obj << /Type /Catalog /Pages 15 0 R /Names << /Dests 10 0 R >> /Metadata 17 0 R >> endobj 59 0 obj << /S 57 /E 160 /Filter /FlateDecode /Length 60 0 R >> stream Cultra has a white skin with pink eyes and a cream flesh. ISBN 90 220 0369 8 The author graduated as Doctor of Agricultural Sciences, Agricultural University, Wageningen, the Netherlands, on a thesis with the same title and contents. Of these, the two most marked types have been called “Raised and “Pitted respectively. The filamentous mycelia have few or no cross walls. Common scab of potato is an efficient saprophyte that can overwinter either in soil or on the surface of tubers and crop residues. 0000011246 00000 n The potato is slightly waxier in texture with a good skin finish. Screening methods to assess scab susceptibility in breeding programs are … Soils with a high pH (recently limed) provide a better environment for the bacteria. This serious disease can be found in all potato-growing areas throughout the world. 0000002597 00000 n 0000003207 00000 n 0000001563 00000 n 0000005268 00000 n Spores are formed in spiral chains at the tips of hyphae. COMMON SCAB OF POTATO Common scab of potato is caused by Streptomyces scabies and occurs throughout the world. 0000061515 00000 n It has good resistance to common scab and leaf roll virus. 0000075763 00000 n 0000001576 00000 n Isolates of an organism that causes common scab of potato were first isolated by Roland Thaxter in Connecticut in 1890 and in 1892 he described the primary strain as Oospora scabies.The original culture was not maintained. /���E*�,�Pi? First recorded in the 1920™s, the disease reached epidemic proportions during the 1970™s. The scab organism sometimes occurs in soils where potatoes have never been grown. Figure 10.—Potato tuber showing severe infection with common scab 32 Figure 11.—Potato tuber infected with powdery scab 33 Figure 12.—Potato tuber infected with the silver scurf organism 34 Figure 13.—Symptoms of skin spot on tubers 35 Figure 14.—Potato … The symptoms of the diseases look similar, but the pathogens and epidemiology of the diseases differ substantially and thus require contrasting management strategies. 0000070115 00000 n 0000014294 00000 n Fig. Research; Open Access; Published: 01 February 2019; The occurrence of potato common scab correlates with the community composition and function of the geocaulosphere soil microbiome . 0000002082 00000 n Common scab of potato caused by S. scabies occurs throughout the world. The scab organism sometimes occurs in soils where potatoes have never been grown. History Common scab of potato, which has worldwide distribution, is caused by filamentous bacteria in the genus Streptomyces. Keywords: potato, common scab, fertilizer levels and NPK Introduction Potato (Solanum Tuberosum) is the most important crop in the world (Anonymous, 2008). �?�����Q���?O�X8Ⱥ��҅뗸����6,��YL�2��&^�i6���7dъ�d�+1��=}7ިB��Y�Z���/q�Ѻ!���w$��M�IEW�'e��FV�I8�HA{�.�֮%֭f���I The major loss from common scab … 431-433 DOI: 10.1126/science.39.1003.431 . Potato scab is a common tuber disease that occurs throughout the potato growing regions of the world. Distribution and characterization of Streptomyces species causing potato common scab in Germany J. Leimingera*, M. Franka, C. Wenkb, G. Poschenriederb, A. Kellermanna and A. Schwarzfischera aBayerische Landesanstalt fu ¨r Landwirtschaft, Institut fur Pflanzenbau und Pflanzenzuchtung, Am Gereuth 8, D-85354 Freising-Weihenstephan; and bBayerische Landesanstalt fu¨r Landwirtschaft, … 0000003961 00000 n Severe scab infection may reduce yield, however. This genus is diverse and … Common scab disease is the greatest economic constraint facing the Australian French potato processing industry and an important disease worldwide wherever potatoes are grown. With Common scab you will notice raised lesions on the skin, which have a cork like texture. Common scab causes significant loss in yield and quality of potatoes worldwide. Common Scab consists of a number of types of scab, which vary considerably in general appearance. 0000012045 00000 n %%EOF However, potato plants are susceptible to devastation by various diseases, such as soft rot disease, bacterial wilt disease, scab disease and dry rot disease (Agrios 1997). 0000004661 00000 n Abstract References PDF XML . 0 It is most prevalent in neutral or slightly alkaline and light sandy and dry soils. 3.2 Mean soil pH of regions sampled plotted against mean 65 minimum pH for growth of pathogenic Streptomyces isolates from the various regions. Due to the lack of efficacious pesticides, crop rotations, and resistant potato cultivars against the disease, we investigated whether biological control can serve as an alternative approach. Research Article : Control of Common Scab of Potato Through Seed Treatment ... and 3% elemental sulphur solution each for two different duration of times i.e. Scab is easily identified. 0000009650 00000 n Common scab of potato, which has a worldwide distribution, is caused by filamentous bacteria in the genus Streptomyces. 0000003721 00000 n In some situations, you can simply remove the scab and the potatoes can still be eaten. 0000015728 00000 n 0000030658 00000 n Taxonomy. Of these, the two most marked types have been called “Raised and “Pitted respectively. It is most prevalent and important in neutral or slightly alkaline soils, especially during relatively dry years. Fig. Potato crop originated from the mountainous tracts of South America where it has been used as an important food crop since ancient time (FAO, 2005). It reduces crop value and, in extreme cases, yield (Hiltunen et al. Direct … 0000075495 00000 n ?�Ë�j:�V���u:%���B�w����ЬO'W�-P[,���9u]P�B-Ё:@+�B�A�R�B�Q��XS��� Science. It has good resistance to common scab and leaf roll virus. It is classed a medium dry potato and is used mainly for boiling, roasting and baking. However, potato plants are susceptible to devastation by various diseases, such as soft rot disease, bacterial wilt disease, scab disease and dry rot disease (Agrios 1997). Although there is no method known to completely control this disease, there are some management options that can help reduce the severity of common scab on potato. %PDF-1.4 %���� 0000008459 00000 n It also inhibits the growth of the seedlings of both monocot and dicot plants. Fig. As no highly effective methods exist for managing CS, this study explored the possibility of using biological control. }>�A�0G�� ܄��W�)�W�+�{(�C���_�����wr�q�r]�u)=�JO���S��Tx*=�JO���S��Txꖼ]�3�:���g_v��rK.�`�Et���A����*�� s�� It is not clear what factors directly determine the nature of the scab symptoms, and different symptoms can be caused by strains of the same species (Loria et al. Science 20 Mar 1914: Vol. The same organism also attacks many other root crops as well as the fleshy roots of weeds. View Enhanced PDF Access article on Wiley Online Library (HTML view) Download PDF for offline viewing. 0000011267 00000 n 0000017753 00000 n Common scab of potato occurs throughout the potato growing regions of the world and is mostly prevalent in neutral to slightly alkaline soil, especially during dry years. Common scab and its control in seed-potato crops /pudooI 1971 Centre for Agricultural Publishing and Documentation Wageningen . Common scab is observed in the most common potato disease in the growing conditions of the US and Europe adversely affecting the marketable yield of potato crops, either through occasional reduction of gross yield (Bang,1979) or, more importantly, through the alteration of tuber skin aspect, which is increasingly important for the fresh market. It is most common on light, sandy soils, low in organic matter. 0000013561 00000 n 0000003216 00000 n alle Romane ; Liebesromane ; Historische Romane ; Erotik Romane Soils that were previously grassland are particularly liable to having the disease. Although not directly affecting tuber yields, disease lesions markedly reduce tuber value and require extra processing steps during French fry production. Common Scab is a disease that can persist indefinitely in some soils and affects all varieties of potatoes. Powdery scab and Common scab are potato blemishes that both result in tubers being rejected or downgraded on the markets and certain levels of seed infection result in rejection of seed batches. In most potato soils, however, scab was probably introduced with infected seed tubers. The same organism also attacks many other root crops as well as the fleshy roots of weeds. endstream endobj 15 0 obj <> endobj 16 0 obj <>stream 0000006120 00000 n Potato common scab. 0000066139 00000 n 0000072739 00000 n Although there is no method known to completely control this disease, there are some management options that can help reduce the severity of common scab on potato. 0000066507 00000 n Cultra has a white skin with pink eyes and a cream flesh. It has been reported on beet, mangel, turnip, rutabaga, radish, carrot, salsify, and parsnip. This potato blemish causes unwanted ugly, scabby lesions that spoil the appearance of the tuber and make them undesirable to consumers or difficult to process. endstream endobj 17 0 obj <> endobj 18 0 obj <> endobj 19 0 obj <>stream Because common scab development is highly dependent on the effects of this single toxin, the current operating paradigm in common scab pathology is that a potato cultivar resistant to one strain of the common scab pathogen is resistant to all strains. Vol 39, Issue 1003 20 March 1914 . 3.1 Potato production regions in South Africa included in the 58 survey. 0000007060 00000 n Common scab of potato, a prevalent disease in potato-growing areas of the world, is caused by a variety of Streptomyces species. Soils that were previously grassland are particularly liable to having the disease. 0000003689 00000 n 0000016492 00000 n Common scab of potatoes is caused by Streptomyces scabies, a very prevale nt, soil-inha biting ba cterium. 2006). 0000008452 00000 n 0000072460 00000 n Common Scab consists of a number of types of scab, which vary considerably in general appearance. Common scab (CS) of potato, caused by a complex of soil bacteria in the genus Streptomyces, is one of the most important potato diseases in North America (Hill and Lazarovits 2005; Loria et al. Download PDF. 0000064164 00000 n Ten bacterial strains were isolated from CS-infected potato tubers from four different locations of Punjab, Pakistan, and identified based on biochemical and molecular analysis. 0000012315 00000 n 0000006231 00000 n Figure 10.—Potato tuber showing severe infection with common scab 32 Figure 11.—Potato tuber infected with powdery scab 33 Figure 12.—Potato tuber infected with the silver scurf organism 34 Figure 13.—Symptoms of skin spot on tubers 35 Figure 14.—Potato … Fig. By H. T. GÜSSOW. It causes common scab on potato (Solanum tuberosum), beet (Beta vulgaris), carrot (Daucus carota), parsnip (Pastinaca sativa), radish (Raphanus sativus), rutabaga (Brassica napobrassica) and turnip (Brassica rapa). Common scab can be particularly severe when potatoes are grown in neutral or alkaline soils (pH 7.0 and above). Common scab can be particularly severe when potatoes are grown in neutral or alkaline soils (pH 7.0 and above). trailer 0000003473 00000 n 0000002175 00000 n Common scab of potato is caused by a common soil-inhabiting bacterium, Streptomyces scabies. ;� �9�� ���1#Q�B���`�'���[�` |t4$�q�6¼5��M�(��B��4��l��#�`��nv�{��4����_�zE�y�c{T �z����J�|��N��(J3=%���V�[�o�g�J�?�������v�����8��+j��F@tT�hr���a���^zG��;��d�ɜ`p\��9��]��~w�c����u�2L�M��w`�K�{'��؅86��Օ>�@�m�Y� The causal organism in all cases examined belongs to the Actinomyces genus. 0000003654 00000 n The causal organism in all cases examined belongs to the Actinomyces genus. Common scab of potato is a superficial tuber disease caused by Streptomyces species that produce the phytotoxin thaxtomin. The potato is slightly waxier in texture with a good skin finish. The disease is generally superficial. This unsightly disease causes lesions on tubers, which lowers marketability and increases the costs of production and processing. 3.2 Mean soil pH of regions sampled plotted against mean 65 minimum pH for growth of pathogenic Streptomyces isolates from the various regions. 0000001316 00000 n Article; Info & Metrics; eLetters; PDF; This is a PDF-only article. Find more similar flip PDFs like Soil nutrition and common scab disease of potato in Australia. Soils with a high pH (recently limed) provide a better environment for the bacteria. 0000028683 00000 n Wencong Shi 1,2, Mingcong Li 1,2, Guangshan Wei 3,4, Renmao Tian 5, Cuiping Li 1,2, Bing Wang 2,6, Rongshan Lin 2,6, Chunyu Shi 1,7, Xiuli Chi 8, Bo Zhou 2,6 & Zheng Gao 1,2,5 … 0000004684 00000 n 18 0 obj << /Linearized 1 /O 20 /H [ 1308 255 ] /L 206379 /E 46354 /N 4 /T 205901 >> endobj xref 18 43 0000000016 00000 n 6 51 0000001542 00000 n 0000070375 00000 n Potatoes are widely cultivated, and could contribute to reducing worldwide food shortages. Every year I get multiple questions about common scab. Some races of the organism can damage tubers at a pH of 5.0 or below, but it's generally accepted that the disease is usually controlled satisfactorily if potato soils are kept at pH 5.0 to 5.2. In subcontinent the cultivation of potato started in 1900 (Malik, 1995). Potato scab is a common disease amongst tubers. �OMp�e�o�ܤNT"�������ѯdc�����Y��;�/f���@*���Gyi�b�����ŧ�dAH����5d:[����]! The cause of common potato scab is a bacterium, Streptomyces Scabies, found in the soil. Research; Open Access; Published: 01 February 2019; The occurrence of potato common scab correlates with the community composition and function of the geocaulosphere soil microbiome . Common scab mainly affects potato (Solanum tuberosum), but can also cause disease on radish (Raphanus sativus), parsnip (Pastinaca sativa), beet (Beta vulgaris), and carrot (Daucus carota). Potato Scab or Common Scab: Streptomyces scabies Potato scab is caused by a soil­borne organism that is worldwide in distribution. Knowledge of CS has expanded considerably over recent years, enabling improved detection of the causal pathogens and increased understanding of mechanisms of pathogenicity, and providing potential methods of … 0000001207 00000 n Common scab has limited effect on tuber yield but greatly affects the tuber quality because of scabby lesions on tuber surface and thereby severely reduces market value of the produce Liu et al., 1996). Thin-skinned potato varieties tend to be more severely affected. Because common scab development is highly dependent on the effects of this single toxin, the current operating paradigm in common scab pathology is that a potato cultivar resistant to one strain of the common scab pathogen is resistant to all strains. Logged in as READCUBE_USER. 0000015749 00000 n x�b```b``ma`c``?� Ȁ ��@������O�_À�q^�h�-��\T�XF��� ց���A���=@ ���^qLaf�:x���[ ��d&�����3d��8D:���(nꝩ��w��g.3���}ͯ� �4�=�w>�ϼD|�p�/�&VƦ ��� �>/Metadata 4 0 R/Pages 3 0 R/Type/Catalog>> endobj 8 0 obj <>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageC]/ExtGState<>>>/Type/Page>> endobj 9 0 obj <> endobj 10 0 obj <> endobj 11 0 obj <> endobj 12 0 obj [/ICCBased 34 0 R] endobj 13 0 obj <> endobj 14 0 obj <>stream /�EE����"�����Mf���A��E�~|8UG$�C�=�l��f���a���4v�0�����-u��y�f]�~�揯��]������:��>�FS׶��Ǯs�ۇm?ã)��>�!��ï��h��m���K��]�����d��K;}m/�K�Ӿ���|�5�f��O�����.�؇��v!��L�������ژ��Ɲc����n��KL^��+�3��B~7��F~�\��BmU�K0s*�8�q����5�"W`Gv`O�`%+�>>nG�e�������������B��B���Y�,�� 10 and 20 min were evaluated again common scab of potato at Battakundi Farm in Kaghan valley in summer 2001. The cause of common potato scab is a bacterium, Streptomyces Scabies, found in the soil. 0000008704 00000 n 0000002275 00000 n Common scab (CS) is an important disease and quality problem in potato crops worldwide. Potato common scab, which is caused by soil-borne Streptomyces species, is a severe plant disease that results in a significant reduction in the economic value of potatoes worldwide. H�\��n�0E�� 0000013814 00000 n See all Hide authors and affiliations. This prompted the initiation of research projects funded initially by state governments, and more recently through a combination of an R&D levy (A$0.50/tonne) matched dollar for dollar by Federal Government funds. It is probably the most popularhome grown white potato in the country. Potatoes are widely cultivated, and could contribute to reducing worldwide food shortages. 0000041160 00000 n Small, rough, reddish or brown corky lesions form on the skin of the tuber. Potato scab control is targeted at preventing infection in potatoes; once your potatoes are covered in scab, it’s too late to treat. All isolates were pathogenic to potato tubers and produced typical symptoms of common scab. Other types are intermediate between these extremes. All isolates were pathogenic to potato tubers and produced typical symptoms of common scab. Common Scab of Potato Caused by Streptomyces Species Taxonomy and Nomenclature Streptomyces is a gram positive, aerobic, filamentous, spore-forming bacterium in the Streptomycetaceae family of the Actinobacteria. The disease does not cause yield losses, damage the flesh, or affect consump-tion of the potatoes. 0000024190 00000 n 0000070876 00000 n Romane Romane . Wencong Shi 1,2, Mingcong Li 1,2, Guangshan Wei 3,4, Renmao Tian 5, Cuiping Li 1,2, Bing Wang 2,6, Rongshan Lin 2,6, Chunyu Shi 1,7, Xiuli Chi 8, Bo Zhou 2,6 & Zheng Gao 1,2,5 … Common scab of potato is a superficial tuber disease caused by Streptomyces species that produce the phytotoxin thaxtomin. Other types are intermediate between these extremes. 0000012789 00000 n The aim of this study was to evaluate certain fungicides against Streptomyces scabies (Thaxter), the main causal agent of common scab disease in potato and other crops, in vitro and in vivo.Fourteen isolates of S. scabies were isolated from naturally infected potato tubers showing common scab symptoms. 0000019658 00000 n Common scab, a serious dis ease of potato tubers, occurs throughout Japan. 0000010268 00000 n It is classed a medium dry potato and is used mainly for boiling, roasting and baking. Common scab is observed in the most common potato disease in the growing conditions of the US and Europe adversely affecting the marketable yield of potato crops, either through occasional reduction of gross yield (Bang,1979) or, more importantly, through the alteration of tuber skin aspect, which is increasingly important for the fresh market. 2006). 0000009861 00000 n Economic losses are greatest when tubers intended for table stock are infected, since appearance is important for this market. ��8� ���\D�ZJ|,ό���j[�n�ѻ�����|鯾a}�S��2ֶk��j�7�zP!�p��|�\۫3����gv�^�Ж[�/��Z�YGSڼ�a�o���yX��z ���|�}�N��E���a������H;��w�UK�b��;�.p��8L*O��� 8N��p΄ L��Fx��pn&�f��I�u2�C8��\���0�I� $�\�r�@�@l���0�Hܨ���$�$� ɝ�.67�7�o�f���͈���77#nnF�� Fig. It is probably the most popularhome grown white potato in the country. Potato Scab or Common Scab: Streptomyces scabies Potato scab is caused by a soil­borne organism that is worldwide in distribution. Common Scab Disease of Potatoes Extension Crops Specialist Steven B. Johnson and Associate Professor of Plant, Soil, and Environmental Science David Lambert Find more of our publications and books at extensionpubs.umext.maine.edu [1]. 0000048220 00000 n The disease symptoms are lesions on the surface of the mature tuber and these can vary widely, being raised, netted, shallow or deep-pitted. Potato common scab. The pathogen is spread from one location to another by splashing water (irrigation or rain) and wind, and on seed tubers and farm equipment with leftover soil residue. 0000001672 00000 n Potato common scab, which is caused by soil-borne Streptomyces species, is a severe plant disease that results in a significant reduction in the economic value of potatoes worldwide. 0000000016 00000 n The disease is caused by pathogenic Streptomyces species, which synthesize the phytotoxin thaxtomin. Scab is easily identified. 0000018161 00000 n 0000012066 00000 n As the disease progresses the corky area will become more raised and generally get darker and rougher. 0000065881 00000 n Depending on the direction of the disease, these corky areas can end up covering the entire exterior of the potato by growing and merging together. SUMMARY. The first page of the PDF of this article appears above. It is most common on light, sandy soils, low in organic matter. This genus is diverse and … 2.2 Lesion types of common scab on BP1 potato tubers in South 17 Africa. 0000005621 00000 n When scab-like lesions form on the tubers, the market quality is significantly reduced. As no highly effective methods exist for managing CS, this study explored the possibility of using biological control. 6 0 obj <> endobj The same pathogen also affects beets, radish, and other root crops. With Common scab you will notice raised lesions on the skin, which have a cork like texture. A worldwide review of seed certification schemes for potato scab shows that it is common for most schemes to accept a certain level of common scab on tubers and place greater importance on scab coverage. �a�K��3T�D�Z�-��j䇬 H��Fw��Z�7��r���F�QP��EG�K:�9="��})q;/�����|���T�=-S��ܳ%�5��@U[��+�I���{�. 0000010588 00000 n Although scab does not usually affect total yields, significant economic losses result from reduced marketability of the tubers. <<091220FB5006034CA625B2B37CA1A5F1>]>> 0000014977 00000 n The same pathogen can cause scab of garden beets, sugar beets, radish, and other crops. endstream endobj 20 0 obj <> endobj 21 0 obj <>stream Potato scab is a common and disfiguring disease of potato tubers that affects potatoes wherever they are grown. The mechanisms of control of potato common scab (Streptomyces scabies) by irrigation were investigated in 5 years by studying the growth and surface microflora of young potato tubers developing in wet or dry soils. Download Soil nutrition and common scab disease of potato in Australia PDF for free. 0000064199 00000 n H�\��n�0��~ The most widely distributed pathogen in the genus is Streptomyces scabies. The disease does not cause yield losses, damage the flesh, or affect consump-tion of the potatoes. History Common scab of potato, which has worldwide distribution, is caused by filamentous bacteria in the genus Streptomyces. Request PDF | On Jan 1, 2003, Khurana SMP Patel RL Patel NH Chaudhri SM Patel RN published Management of common scab of potato | Find, read and cite all the research you need on ResearchGate Log out of ReadCube. Potato common scab is a widespread disease in which scab-like lesions develop on tubers. 0000007841 00000 n Streptomyces scabies and Streptomyces turgidiscabies are soil- and seed-borne pathogens of the common scab. Fig. 0000070960 00000 n This plant disease is found wherever these vegetables are grown. 0000045990 00000 n |��_���K�%�z�쵡�@sV�Y g%��pV�Y�'`>�ll�ll�ll�ll�s��2�"���������������������fO�{2�"�2��>(�*�*�*�*�*�*�*�*�*����»a�n�n�7�� �F~����o�7�� �F~����o�7�oșNX��[��H��?w���cZ�y��=Æ�]�����*� ���b Future potato beds can be protected from scab by keeping the soil pH of beds around 5.2 with liberal applications of sulphur. 0000014956 00000 n Ten bacterial strains were isolated from CS-infected potato tubers from four different locations of Punjab, Pakistan, and identified based on biochemical and molecular analysis. Every year I get multiple questions about common scab. Menu. 0000008206 00000 n 3.1 Potato production regions in South Africa included in the 58 survey. |��_���W�+�� Fig. H��WMs�8��W�hv*G�bI������-�须�#�q�Ƒ]KI7�~� Z����hR& �#�k��T�ƪbf��f�]գ�����T-�NLV௵�w�T��a�V�.>Ú�ft17�ʨ�zd.ʃ.�Ung�¤V��G?��:1��I'��^��Zm �����eH���Q�\���3؇r2�p\C��o�_�W0XП{��4>� ��5-}�����A��ymE�m�`���Ž���S���ę�؉)�J���+� � ���M-�8w��5���4�x�\��Z�n9) 0000076176 00000 n 0000006250 00000 n 0000007467 00000 n 0000017361 00000 n Common scab has limited effect on tuber yield but greatly affects the tuber quality because of scabby lesions on tuber surface and thereby severely reduces market value of the produce Liu et al., 1996). 0000076289 00000 n 0000009840 00000 n levels of common scab resistance in the potato breeding populations. 0000004910 00000 n ��[����/$OM?���zZc�Ʃ'�:Ǐ��A�,�ԯ t��� 0000021541 00000 n H�\�͎�@���s�=����{WB���+����`;H1 �~�LQ�F�%L!讯ڴ��~����g�Ǿ>�ɟڮ㵿�u��xn;��}����j��/��R��~��eߝzW�>���]����M��.�66ql����=�?���/�j�xr��K5|�.�gs�˾I�����j�=��>D���K��}�CUDZ��ѕ��Y��#}V.v��5g��T��FW. 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