scholarly journals Distribución de Rhynchosporium secalis en el mundo y en México

2017 ◽  
pp. 3
Author(s):  
Magda Carvajal-Moreno
Keyword(s):  
Baja California ◽  
Rhynchosporium Secalis ◽  
Leaf Blotch ◽  
Worldwide Distribution ◽  
Causal Fungus ◽  
Barley Leaf

The present work is a review of the distribution of Rhynchosporium secalis (Oud.) Davis, causal fungus of barley leaf blotch, because this disease is of great importance to the mentioned crop. This fungus is of worldwide distribution and it is present in 34 countries at least. In Mexico, it is found in the central part of the country, in the states of Hidalgo, Puebla, Tlaxcala, Mexico, Jalisco, Zacatecas, Veracruz, Aguascalientes and Querétaro. It also attacks the bar ley of the northern part of Mexico, causing damage in Ensenada and North Baja California.

Benzimidazole resistance in Rhynchosporium secalis and its effect on barley leaf blotch control in the UK

1999 ◽  
Vol 18 (4) ◽  
pp. 239-243 ◽  
Author(s):  
P.J. Taggart ◽  
T. Locke ◽  
A.N. Phillips ◽  
N. Pask ◽  
D.W. Hollomon ◽  
...  
Keyword(s):  
Rhynchosporium Secalis ◽  
Leaf Blotch ◽  
Benzimidazole Resistance ◽  
Barley Leaf ◽  
The Uk

scholarly journals Efecto del deshierbe sobre la transmisión de la escaldadura de la cebada, por el hongo Rhynchosporium secalis (Oud.) Davis y en la germinación de semillas

2017 ◽  
pp. 13
Author(s):  
Magda Carvajal-Moreno ◽  
Enrique Riojas-Guadiana ◽  
Ignacio Méndez
Keyword(s):  
Seed Germination ◽  
Seed Transmission ◽  
The Other ◽  
Rhynchosporium Secalis ◽  
Barley Plant ◽  
Leaf Blotch ◽  
Barley Leaf

The effect of weeding on the transmission of barley leaf blotch, as well as on the germination of seeds was studied. Ten gene tic lines and three cultivars of barley were used divided in 2 plots, each having 40 blocks of 2 x 1.5 m to provide the source of seed, as well as the data about splash transmission of scald. One plot contained weeds and the other did not. The seeds from all the 80 blocks were collected and sown in the glasshouse for germination tests and for the study of seed transmission of the fungus. The foliar area affected by leaf blotch and transmitted by splash water, in general 'was less in the weedy plot in the field, because the inoculum had more obstacles to overcome, jumping from one sick barley plant to a healthy one; thus there was less germination of the seeds from this plot. The clean plot had twice the number of leaf blotch infected plants, and a better rate of seed germination in the glasshouse.

Tolerances of barley cultivars to post-emergence herbicides

1986 ◽  
Vol 26 (3) ◽  
pp. 383 ◽  
Author(s):  
D Lemerle ◽  
CR Kidd ◽  
BJ Read
Keyword(s):  
New South ◽  
Spring Barley ◽  
Crop Damage ◽  
Rhynchosporium Secalis ◽  
Plant Responses ◽  
Severe Damage ◽  
Barley Cultivars ◽  
South Wales ◽  
Barley Leaf ◽  
Adverse Environmental Conditions

Sixteen spring barley cultivars were tested in southern New South Wales for their tolerances to 12 post-emergence herbicides applied at the recommended rates and at three times those rates. Examples of unsafe combinations of cultivars and herbicides (at recommended rates) that have a risk of crop damage in this environment include: Shannon with bromoxynil at 0.42 kg/ha; Panvan with bromoxynil plus MCPA at 0.42 + 0.42 kg/ha; Bandulla, Beecher, Clipper, Malebo, Panvan and Weeah with dicamba at 0.08 kg/ha; and Clipper, Galleon, Lara and Shannon with dicamba plus MCPA at 0.11 + 0.48 kg/ha. Severe damage occurred to barleys from diclofop-methyl at 0.56 kg/ha and from chlorsulfuron at 0.01 8 kg/ha. Cultivars which showed tolerance were Grimmett, Lara, Stirling and Shannon with chlorsulfuron, and Shannon and Weeah with diclofop-methyl. The use of rates three times those recommended by the manufacturers in these experiments identified the susceptibility of additional cultivars which could be at risk of crop damage from overdosing, incorrect timing of application, or adverse environmental conditions. For example, Lara and Corvette with bromoxynil at 1.26 kg/ha; Corvette and Shannon with bromoxynil plus MCPA at 1.26 + 1.26 kg/ha; Corvette, Cutter, Galleon, Lara, Panvan, Schooner, and Shannon with dicamba plus MCPA at 0.33 + 1.44 kg/ha. The grain yields ofall cultivars were unaffected by both rates of difenzoquat, diuron, linuron, methabenzthiazuron or 2,4-D. The risks of crop damage v. the benefits of weed control are discussed. Seasonal variation was observed in the herbicidexcultivar interactions and this variation was sometimes of a greater magnitude than the differences between the cultivars. An interaction was observed between the incidence of barley leaf scald (Rhynchosporium secalis) and treatment with chlorsulfuron or diclofop-methyl. Routine screening of herbicides and crop cultivars for dangerous interactions is recommended, and we need a greater understanding of the effects of environmental factors on plant responses to herbicides.

AC Stacey barley

1995 ◽  
Vol 75 (2) ◽  
pp. 461-463
Author(s):  
R. I. Wolfe ◽  
D. G. Faris ◽  
J. G. N. Davidson ◽  
P. J. Clarke
Keyword(s):  
Research Centre ◽  
Rhynchosporium Secalis ◽  
Hordeum Vulgare L ◽  
Early Maturity ◽  
Leaf Scald ◽  
Peace River ◽  
River Region ◽  
Early Maturing ◽  
Cultivar Description ◽  
Barley Leaf

AC Stacey is an early maturing, six-row feed barley (Hordeum vulgare L.) with excellent barley leaf scald resistance. It was developed at the Northern Agriculture Research Centre, Beaverlodge, Alberta from the cross Otal/Melvin. It is moderately strong strawed, and adapted to barley leaf scald prone areas in Alberta, and the Peace River region of British Columbia. Key words:Hordeum vulgare, barley, early maturity, cultivar description, Rhynchosporium secalis, scald

Rhynchosporium secalis. [Descriptions of Fungi and Bacteria].

1973 ◽  
Author(s):  
H. Owen
Keyword(s):  
Geographical Distribution ◽  
Secale Cereale ◽  
Seed Transmission ◽  
Small Extent ◽  
Rhynchosporium Secalis ◽  
Water Droplets ◽  
Leaf Blotch

Abstract A description is provided for Rhynchosporium secalis. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Hordeum sativum, Secale cereale, Gramineae, Agropyron, Bromus, Hordeum and Lolium. DISEASE: Leaf blotch or scald of barley (Hordeum sativum), rye (Secale cereale) and various other Gramineae, especially species of Agropyron, Bromus, Hordeum and Lolium. Mainly leaves and sheaths are attacked; also glumes and awns of barley. Lesions on leaves are lenticular, usually 1-2 cm long, often confluent. The first sign of infection is watersoaking, then the area becomes bluish-grey, and later the central part becomes pale greyish-brown, with a distinct dark brown or violet brown border, except on rye where no dark border is formed. GEOGRAPHICAL DISTRIBUTION: Widespread but mostly in temperate regions (CMI Map 383, ed. 3, 1970). TRANSMISSION: Overwintering is largely on infected barley stubble remains and volunteer plants; spores are disseminated in water droplets (17, 22; 39, 300; 46, 1988; 49, 116; 51, 283, 2401). Seed transmission occurs to a small extent (38, 385; 39, 300; 43, 1225k; 51, 282; Kay & Owen, 1973a).

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