Relationship between silver scurf levels on seed and progeny tubers from successive generations of potato seed

2006 ◽  
Vol 83 (6) ◽  
pp. 447-453 ◽  
Author(s):  
B. Geary ◽  
D. A. Johnson
Keyword(s):  
Potato Seed ◽  
Silver Scurf ◽  
Successive Generations

scholarly journals Evaluation of different fungicides applied as seed tuber treatments for the control of potato silver scurf

2005 ◽  
Vol 82 (2) ◽  
pp. 41-48 ◽  
Author(s):  
V. Hervieux ◽  
R. Chabot ◽  
J. Arul ◽  
R.J. Tweddell
Keyword(s):  
Solanum Tuberosum ◽  
Seed Tuber ◽  
Field Trials ◽  
Potato Seed ◽  
Silver Scurf ◽  
Helminthosporium Solani ◽  
Potato Tubers ◽  
Experimental Conditions ◽  
Soil Inoculum ◽  
Seed Tubers

Silver scurf of potatoes (Solanum tuberosum), caused by the fungus Helminthosporium solani, is an important surface-blemishing disease of potato tubers. The objective of the study was to evaluate the efficacy of different fungicides applied to potato seed tubers for control of silver scurf. Field trials were conducted in Québec province in 1998 and 1999. Potato seed tubers infected with H. solani were treated with either talc, fludioxonil, mancozeb, iprodione, thiabendazole, imazalil or azoxystrobin, and planted at three locations in 1998 and two locations in 1999. The results showed that, under our experimental conditions, the fungicides tested, applied as seed treatments, did not significantly influence total and marketable yields as well as silver scurf severity on daughter tubers at harvest and after different storage periods. In addition, this study showed the influence of the experimental locations on silver scurf development and suggests that soil inoculum plays a role in the epidemiology of the disease.

Transmission of Helminthosporium solani from potato seed tubers and effects of soil conditions, seed inoculum and seed physiology on silver scurf disease

1995 ◽  
Vol 124 (2) ◽  
pp. 219-234 ◽  
Author(s):  
D. M. Firman ◽  
E. J. Allen
Keyword(s):  
Weight Loss ◽  
Field Experiments ◽  
Soil Conditions ◽  
Potato Seed ◽  
Silver Scurf ◽  
Moisture Regime ◽  
Helminthosporium Solani ◽  
Seed Tubers ◽  
Soil Moisture Regime ◽  
One Year

SUMMARYThe transmission of silver scurf (Helminthosporium solani) disease of potatoes was examined in field experiments at Cambridge University Farm in 1988–90. Treatment factors examined were seed size, seed age, seed incubation, soil moisture regime and planting date. A laboratory experiment investigated the viability of conidia of Helminthosporium in soil stored under different conditions.Incubation of seed at high humidity before planting increased sporulation of Helminthosporium on seed tubers after planting and fewer conidia were produced from small seed than from larger seed. Delay in planting caused more rapid growth of Helminthosporium on seed tubers after planting.Early planting and late harvesting increased the severity of silver scurf on progeny tubers. Severity of silver scurf was also increased by ageing seed and by incubating seed. Weight loss of potato tubers during storage tended to be greater from treatments with most severe silver scurf in all years but a significant linear regression of weight loss on silver scurf severity was found in only one year out of three from a late harvest. The viability of conidia added to soil was found to decrease rapidly so that by 10 weeks after addition, < 1% of conidia were apparently viable.

Treatment of potato seed and ware tubers with imazalil and thiabendazole for control of silver scurf and other storage diseases

1983 ◽  
Vol 26 (2) ◽  
pp. 163-173 ◽  
Author(s):  
G. R. Cayley ◽  
G. A. Hide ◽  
P. J. Read ◽  
Yvonne Dunne
Keyword(s):  
Potato Seed ◽  
Silver Scurf ◽  
Storage Diseases

EVALUATION DE L’IMPORTANCE RELATIVE DU SOL ET DE LA SEMENCE COMME SOURCE D’INOCULUM DE LA TACHE ARGENTEE DES POMMES DE TERRE AU MOYEN D’ESSAIS DE REPRESSION

1967 ◽  
Vol 47 (6) ◽  
pp. 695-702 ◽  
Author(s):  
Jacquelin Santerre
Keyword(s):  
Cultural Practices ◽  
Inorganic Mercury ◽  
Health Condition ◽  
Potato Seed ◽  
Silver Scurf ◽  
Seed Potatoes ◽  
Mercury Compounds ◽  
Seed Tubers ◽  
Good Surface ◽  
Disease Free

The disinfection of potato seed tubers with formalin, organic and inorganic mercury compounds is useless against silver scurf of potatoes caused by Helminthosporium atrovirens. Although generally good surface disinfectants, these fungicides cannot reach the mycelium of the fungus growing underneath the skin. When conditions are again favorable, the pathogen will grow conidiophores that will bear conidia, the germination of which is not impaired by the previous treatments.Cultural practices such as fallow, crop rotation as well as soil treatments with Lanstan (soil fungicide) or Vapam (soil fumigant) did not reduce the percentage of infected tubers at harvest when used in conjunction with apparently disease-free potato seed tubers.Besides showing the ineffectiveness of disinfecting potato seed tubers, these results indicate that evaluating the true health condition of seed-potatoes according to whether or not the fungus is present on the skin is not to be relied upon, that sorting out visibly infected tubers does not suffice to free a "seed" from the disease, and that cultural practices and chemical soil treatments are useless if the seed-potatoes are already infected, thereby laying emphasis on the infected potato seed tubers as the main source of inoculum for silver scurf.

Age of potato seed-tubers influences protein synthesis during sprouting

1993 ◽  
Vol 89 (2) ◽  
pp. 262-270 ◽  
Author(s):  
G. N. Mohan Kumar ◽  
N. Richard Knowles
Keyword(s):  
Protein Synthesis ◽  
Potato Seed ◽  
Seed Tubers

Through the Lens of Gurdjieff

2016 ◽  
Vol 11 (1) ◽  
pp. 36-52
Author(s):  
Michael Pittman
Keyword(s):  
Participant Observation ◽  
Field Research ◽  
Spiritual Transformation ◽  
Spiritual Practice ◽  
Asia Minor ◽  
Eastern Asia ◽  
The Caucasus ◽  
Successive Generations ◽  
Spiritual Conversation

G. I. Gurdjieff (c.1866–1949) was born in Gyumri, Armenia and raised in the Caucasus and eastern Asia Minor. He also traveled extensively throughout Turkey to places of pilgrimage and in search of Sufi teachers. Through the lens of Gurdjieff’s notion of legominism, or the means by which spiritual teachings are transmitted from successive generations, this article explores the continuing significance of spiritual practice and tradition and the ways that these forms remain relevant in shaping contemporary trends in spirituality. Beginning with Gurdjieff’s use of legominism, the article provides reflection on some early findings done in field research in Turkey— through site visits, interviews and participant-observation—conducted in the summers of 2014 and 2015. The aim of the project is both to meet individuals and groups, particularly connected to Sufism, that may have some contact with the influences that Gurdjieff would have been familiar with, and to visit some of the sites that were part of Gurdjieff’s early background and which served to inform his work. Considerations of contemporary practices include the view of spiritual transmission, and practices of pilgrimage, prayer and sohbet, or spiritual conversation, in an ongoing discourse about spiritual transformation.

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