Field experiments on sugar‐beet downy mildew <i>(Peronospora farinosa)</i>

Byford, W. J.

doi:10.1111/j.1744-7348.1967.tb05926.x

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…The proportions of plants in each stock which showed severe symptoms of downy mildew were recorded on five dates (Table 4), but sporulators were not distinguished from non-sporulators. The results confirmed previous observations by Byford (19676) that most plants recover from infection with downy mildew, but suggested that plants of some sugar-beet stocks recovered more quickly from the disease than those of other stocks. Stocks that had been selected for resistance to P. farinosa were more resistant at each scoring date than the stocks from which they had been derived.…”

Section: Cambridge Experiments 1965supporting

confidence: 90%

Experiments in selecting for resistance to downy mildew in sugar beet

Russell

1968

J. Agric. Sci.

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In tests with seedlings in the glasshouse, significant differences in susceptibility to downy mildew, caused by Peronospora farinosa f. sp. betae, were observed between individual stocks of sugar beet. The resistance of a particular stock in glasshouse tests was not always a reliable guide to its resistance in the field. There were also serious discrepancies between the results of tests with seedlings and those with mature plants in the field, suggesting that the resistance of certain stocks, relative to one another, may vary with increasing age of the host plant. This contention was supported by evidence from a field experiment in which the susceptibility of several sugar-beet stocks was compared throughout the growing season. It also appears that changes in environmental conditions affected resistance to downy mildew more in some stocks than in others.Progenies of selected plants that had not shown severe symptoms of downy mildew, after exposure to natural inoculation with P. farinosa for more than 3 months in the field, were much more resistant than the parent stocks. This showed that a single generation of selection under suitable conditions can significantly improve the resistance of sugar-beet breeding stocks to downy mildew.An inbred sugar-beet line of American origin showed exceptional resistance to downy mildew in experiments under glass and in the field. Inoculated plants of this line usually showed no symptoms of the disease and P. farinosa did not produce conidia on them. These results show that sources of extreme resistance are present in cultivated sugar beet and suggest that an excellent control of downy mildew in Britain may eventually be achieved through the use of resistant varieties.

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Section: Cambridge Experiments 1965supporting

confidence: 90%

Experiments in selecting for resistance to downy mildew in sugar beet

Russell

1968

J. Agric. Sci.

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“…Due to taxonomic confusion, downy mildew was previously classified as Peronospora farinosa and considered as such by most studies for about 50 years [ 24 , 25 , 26 ]. Byford (1967a,b) [ 27 , 28 ] investigated cross-inoculation experiments and concluded the division of three formae speciales (f. spp.)…”

Section: Downy Mildew Of Quinoamentioning

confidence: 99%

A Review of Chenopodium quinoa (Willd.) Diseases—An Updated Perspective

Colque-Little

Amby

Andreasen

2021

Plants

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The journey of the Andean crop quinoa (Chenopodium quinoa Willd.) to unfamiliar environments and the combination of higher temperatures, sudden changes in weather, intense precipitation, and reduced water in the soil has increased the risk of observing new and emerging diseases associated with this crop. Several diseases of quinoa have been reported in the last decade. These include Ascochyta caulina, Cercospora cf. chenopodii, Colletotrichum nigrum, C. truncatum, and Pseudomonas syringae. The taxonomy of other diseases remains unclear or is characterized primarily at the genus level. Symptoms, microscopy, and pathogenicity, supported by molecular tools, constitute accurate plant disease diagnostics in the 21st century. Scientists and farmers will benefit from an update on the phytopathological research regarding a crop that has been neglected for many years. This review aims to compile the existing information and make accurate associations between specific symptoms and causal agents of disease. In addition, we place an emphasis on downy mildew and its phenotyping, as it continues to be the most economically important and studied disease affecting quinoa worldwide. The information herein will allow for the appropriate execution of breeding programs and control measures.

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“…The disease is potentially important in most areas where the root crop is grown in the U.K. Disease development is complex and few comprehensive assessments of possible yield losses have been made. From studies of yield losses in individual roots, Byford (1967b) concluded that infection of 20 % of the plants of a moderately resistant variety in July and August could lead to 10 yo reduction of sugar yield. Disease incidence in root crops is usually greatest when they are grown near to seed crops of sugar beet or mangolds, in which the fungus readily overwinters (Byford & Hull, 1967).…”

Section: Introductionmentioning

confidence: 99%

Selecting for resistance to downy mildew of sugar beet

Brown

1977

Annals of Applied Biology

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Sugar beet seedlings were evaluated for resistance to downy mildew by exposing them to natural infection in a glasshouse maintained at a high relative humidity (c. 9598%). Exposure to natural infection for at least 3 days was required for adequate infection levels which occurred in the majority of tests; failure in others was related to decreases in relative humidity during clear weather. Seedling disease symptoms were different from those of mature plants. In most instances there was adequate differentiation among seedlings in populations with low, but worthwhile, levels of variation for resistance. The application of the method in selection programmes for resistance is discussed.Journal of Agricultural Science, Cambridge 71, 251-256. RUSSELL, G. E. (1969). Recent work on breeding for resistance to downy mildew (Peronospora farinosa) in sugar beet.

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Field experiments on sugar‐beet downy mildew (Peronospora farinosa)

Cited by 8 publications

References 7 publications

Experiments in selecting for resistance to downy mildew in sugar beet

Experiments in selecting for resistance to downy mildew in sugar beet

A Review of Chenopodium quinoa (Willd.) Diseases—An Updated Perspective

Selecting for resistance to downy mildew of sugar beet

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