scholarly journals Characteristics of wheat leaf diseases development in Latvia

2012 ◽  
Vol 58 (2) ◽  
pp. 329-334 ◽  
Author(s):  
Biruta Bankina ◽  
Ilza Priekule
Keyword(s):  
Powdery Mildew ◽  
Septoria Tritici ◽  
Field Observations ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch ◽  
Wheat Leaf ◽  
Disease Epidemics

The field observations were carried out in 1999-2004 on 29 fields in Latvia. Incidence and severities of wheat leaf diseases were determined. Tan pot caused by <i>Drechslera tritici</i>-<i>repentis</i> and Septoria leaf blotch, induced by <i>Septoria tritici</i> were the most harmful diseases at the time of research (incidence 10-100% and 1-100%, respectively). Also the incidence of powdery mildew, caused by <i>Blomeria graminis</i> was high (4-100%), while that of rusts (<i>Puccinia tritici</i> and <i>P. striiformis</i>) was very low. Changes in disease epidemics were determined and showed the differences between the analyzed diseases.

Analysis of expressed sequence tags from the wheat leaf blotch pathogen Mycosphaerella graminicola (anamorph Septoria tritici)

2005 ◽  
Vol 42 (5) ◽  
pp. 376-389 ◽  
Author(s):  
John Keon ◽  
John Antoniw ◽  
Jason Rudd ◽  
Wendy Skinner ◽  
John Hargreaves ◽  
...  
Keyword(s):  
Expressed Sequence Tags ◽  
Mycosphaerella Graminicola ◽  
Septoria Tritici ◽  
Leaf Blotch ◽  
Wheat Leaf ◽  
Expressed Sequence

AC Hamilton barley

1995 ◽  
Vol 75 (3) ◽  
pp. 697-698 ◽  
Author(s):  
K. M. Ho ◽  
W. L. Seaman ◽  
T. M. Choo ◽  
R. A. Martin
Keyword(s):  
Hordeum Vulgare ◽  
Powdery Mildew ◽  
High Yield ◽  
Research Centre ◽  
Hordeum Vulgare L ◽  
Eastern Canada ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch ◽  
Barley Breeding ◽  
Moderately Resistant

AC Hamilton is a six-rowed spring feed barley (Hordeum vulgare L.) cultivar bred at the Plant Research Centre, Agriculture and Agri-Food Canada, and evaluated by the Eastern Canada Barley Breeding Group. It was selected from a Leger/OAC Kippen cross and is suitable for growing in Ontario, where it outyielded the check cultivars AC Stephen and Chapais. AC Hamilton is moderately resistant to powdery mildew (Erysiphe graminis f. sp. hordei) and is resistant to septoria leaf blotch (Septoria passerinii). Key words:Hordeum vulgare L., six-rowed barley, feed barley, high yield, powdery mildew

scholarly journals Fungicides against diseases of lawn grass leaves

2019 ◽  
pp. 7-9
Author(s):  
S. Retman ◽  
O. Nychyporuk ◽  
О. Shevchuk
Keyword(s):  
Powdery Mildew ◽  
Technical Efficiency ◽  
Disease Severity ◽  
Growing Season ◽  
Disease Spread ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch ◽  
Chemical Groups ◽  
Positive Effect

Goal. To evaluate the effectiveness of the use of fungicides of various chemical groups against the leaf diseases turfgrass. Methods. The research was carried out in 2015—2017 on the lawn mixture «Universal» in the zone of the Polissya of Ukraine. The effect of fungicides of various chemical groups was investigated (Impact T, SC; Bumper Super, EC; Amistar Extra 280 SC, SC; Alto Super 300 EC, EC; Maxim 025 FS, FS; Horus 75 WG, WG). Fungicides were applied twice. The first spraying was carried out when development of diseases in control plot reached 3—5%, the second — in 30 days. The assessments were performed according to generally accepted methods, disease spread, disease severity and technical efficiency of pesticides were determined. Results. During the period of research, the most common leaf diseases of turfgrass, which eveloped annually and had a significant severity during the growing season, were powdery mildew and septoria leaf blotch. After two-time spraying, the technical efficiency of fungicides against powdery mildew reached 82.2—92.2%, against septoria leaf blotch up to 80.2%. The most effective against powdery mildew was the use of Alto Super 330 EC, EC (0.5 l / ha), Amistar Extra 280 SC, SC (0.75 l / ha) and tank mixture of Maxim 025 FS, FS (0.75 l / ha and 1.0 l / ha) with Horus 75 WG, VH (0.6 kg / ha). Against the septoria leaf blotch, the highest efficiency was shown by Alto Super 330 EC, EC (0.5 l / ha), Bumper Super, EC (0.8 l / ha) and Maxim 025 FS, FS (1.0 l / ha) + Horus 75 WG, WG (0.6 kg / ha). In addition, due to the reduction of disease severity, a positive effect of fungicides on the quality of the lawn was achieved and the projective coating increased to 92—93%. Conclusion. The use of fungicides contributes to the reduction of disease and the formation of quality herbs. The best indicators against flour dew and septoriosis of leaves were obtained for the treatment of Alto Super 330 EC, CE (0.5 l / ha) and tank Maxim 025 FS, tc.s. (1.0 l / ha) + Horus 75 WG, VH (0.6 kg / ha).

scholarly journals Peculiarities of action and retrospective analysis of fungicides efficacy for protection of soft winter wheat against leaf diseases

2020 ◽  
Vol 103 (4) ◽  
pp. 224-232
Author(s):  
N. A. Krupenko* ◽  
I. N. Odintsova
Keyword(s):  
Powdery Mildew ◽  
Winter Wheat ◽  
Retrospective Analysis ◽  
Area Under The Curve ◽  
Disease Development ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch ◽  
Biological Efficacy ◽  
Two Component ◽  
Soft Winter Wheat

The data on the efficacy of 40 fungicides for protection of soft winter wheat against leaf diseases during 2010–2019 are demonstrated. Biological efficacy is calculated based upon the area under the curve of disease development. Biological and economical efficacy of those compounds has been analyzed depending on the number of components, as well as chemical classes of active agents in those compounds. The highest biological efficacy of one-component fungicides against powdery mildew has been recorded for those containing proquinazid, tebuconazole and metrafenone – 69.9–79.3 %. Among 23 two-component fungicides the higher efficacy (82.1–84.3 %) against powdery mildew has been recorded for the fungicides containing azole combined with morpholine. Biological efficacy against Septoria leaf blotch has varied from 64.7 to 88.0 % depending on fungicide composition. Among three-component fungicides the efficacy against powdery mildew has varied from 59.5 to 82.8 %, and against Septoria leaf blotch it has varied from 59.8 to 89.9 %. As a result of the diseases severity decrease due to the fungicide application the saved yield has reached 9.9 centner of grain per hectare.

scholarly journals Practical application of integrated disease management

2002 ◽  
Vol 38 (SI 1 - 6th Conf EFPP 2002) ◽  
pp. 212-220 ◽  
Author(s):  
V. Zinkernagel ◽  
H. Hausladen ◽  
H. Habermeyer
Keyword(s):  
Decision Support ◽  
Disease Management ◽  
Powdery Mildew ◽  
Tan Spot ◽  
Integrated Disease Management ◽  
Practical Application ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch ◽  
Advisory Service ◽  
Glume Blotch

A decision support system for cereal diseases and late blight of potatoes has been developed at the Chair of Phytopathology,<br />Technische Universität München. The Wheat and Barley Prognosis System has been in use for many years by the<br />Bavarian official advisory service. It is based on an exact diagnosis and established biological thresholds influenced by<br />weather. Certain fungicides are recommended also covering diseases which have not reached the threshold. Diseases under<br />consideration are eye spot disease, powdery mildew, Septoria leaf blotch, Septoria leaf and glume blotch, tan spot, brown<br />and yellow rusts.The PhytophthoraModel Weihenstephan consists of two parts, weather based prognosis and monitoring in<br />the unsprayed control plots. Spraying recommendations are given based on the results of the above-mentioned parts and<br />considering cultivar behaviour and blight development in the field. The first spraying in the season as well as the timing<br />of the following ones are crucial. This model does not give any recommendations regarding which active ingredient should<br />applied. However there is a distinction made with regard to contact (protective) fungicides and systemic fungicides. The<br />PhytophthoraModel Weihenstephan has been in use for several years in Germany as well as in Austria.

scholarly journals Hidden in plain sight: a molecular field survey of three wheat leaf blotch fungal diseases in North-Western Europe shows co-infection is widespread

2021 ◽  
Author(s):  
Annemarie Fejer Justesen ◽  
Beatrice Corsi ◽  
Andrea Ficke ◽  
Lorenz Hartl ◽  
Sarah Holdgate ◽  
...  
Keyword(s):  
Quantitative Polymerase Chain Reaction ◽  
Tan Spot ◽  
Fungal Diseases ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Disease Assessment ◽  
Mixed Infections ◽  
Regional Survey ◽  
Leaf Blotch ◽  
Wheat Leaf

AbstractWheat (Triticum aestivum L.) yields are commonly affected by foliar infection by fungal pathogens. Of these, three wheat leaf blotch fungal diseases, septoria nodorum blotch (SNB), tan spot (TS) and septoria tritici blotch (STB), caused by Parastagonospora nodorum (Pn), Pyrenophora tritici-repentis (Ptr) and Zymoseptoria tritici (Zt), respectively, induce major yield losses. Infection results in necrotic areas on the leaf, and it is often difficult to determine the underlying causative pathogen from visible symptoms alone, especially in mixed infections. Here, a regional survey of 330 wheat samples collected across three seasons (years 2015–2017) from four north-west European countries was undertaken. Using quantitative polymerase chain reaction (qPCR) assays specific for each pathogen, as well as disease assessment of leaf materials, distinct regional differences were identified. Two-thirds (65%) of all samples harbored at least two of the three pathogens. Norway had high SNB abundance, but also showed mixed infections of SNB, TS and STB. In Germany, TS was prevalent, with STB also common. Danish samples commonly possessed all three pathogens, with STB prevalent, followed by TS and SNB. The UK had a major prevalence of STB with minimal occurrence of TS and SNB. Across all samples, qPCR identified Zt, Pn and Ptr in 90%, 54% and 57% of samples, respectively. For each pathogen, average disease levels via visual assessment showed modest positive correlation with fungal DNA concentrations (R2 = 0.13–0.32). Overall, our study highlights that the occurrence of mixed infection is common and widespread, with important implications for wheat disease management and breeding strategies.

scholarly journals Wheat Leaf Diseases and Possibilities of Computer Program Application for Disease Control

2006 ◽  
Vol 1 ◽  
pp. 38
Author(s):  
B. Bankina ◽  
I. Priekule
Keyword(s):  
Plant Protection ◽  
Tan Spot ◽  
Septoria Tritici ◽  
Main Task ◽  
Treatment Frequency ◽  
Leaf Blotch ◽  
Frequency Index ◽  
Wheat Leaf ◽  
Program Application ◽  
Program Validation

The main task of integrated plant protection is to reduce usage of pesticides and to address a request of farmers to cut down variable costs for winter wheat growing (including costs of fungicides). A new tool providing these requirements is a Decision support system based on PC program. Validation trials of PC-P Diseases were carried out in collaboration with Danish Institute of Agricultural Sciences in 1999-2002 in different regions in Latvia. Comparisons were made among standard treatments with full dose of Tango Super (epoxiconazole 84 g l-1, fenpropimorf 250 g l-1) in GS 51-55, split doses in GS 37-39 and GS 51-55 and treatment according to PC-P recommendation. Tan spot (Drechslera tritici-repentis), leaf blotch (Septoria tritici) and mildew (Blumeria graminis) were the most important diseases in this period. The results of trials showed that average doses of fungicide were decreased according to PC-P Diseases recommendations, treatment frequency index fluctuated from 0.2-1.02. Reduced doses of fungicides showed the same efficiency of diseases control as standard doses. Level of additional yield was similar in comparison with variants where standard doses were used.

scholarly journals Assessing the Accuracy of Simulation Model for Septoria Leaf Blotch Disease Progress on Winter Wheat

Plant Disease ◽  
2009 ◽  
Vol 93 (10) ◽  
pp. 983-992 ◽  
Author(s):  
M. El Jarroudi ◽  
P. Delfosse ◽  
H. Maraite ◽  
L. Hoffmann ◽  
B. Tychon
Keyword(s):  
Winter Wheat ◽  
Disease Severity ◽  
Statistical Tests ◽  
Mechanistic Model ◽  
Probability Of Detection ◽  
Septoria Tritici ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch ◽  
Disease Occurrence ◽  
The Difference

A mechanistic model, PROCULTURE, for assessing the development of each of the last five leaf layers and the progress of Septoria leaf blotch, caused by Septoria tritici (teleomorph Mycosphaerella graminicola), has been applied on susceptible and weakly susceptible winter wheat (Triticum aestivum) cultivars in two locations (Everlange and Reuland) in Luxembourg over a 3-year period (2000 to 2002). A double performance assessment of PROCULTURE was conducted in this study. First, the capability of PROCULTURE to correctly simulate S. tritici incidence was checked. Second, the model's ability to accurately estimate disease severity was assessed on the basis of the difference between simulated and observed levels of disease development at each leaf layer. The model accurately predicted disease occurrence in the 2000 and 2002 seasons, on susceptible and semi-susceptible cultivars, with a probability of detection (POD) exceeding 0.90. However, in 2001, even though the POD never fell below 0.90, the false alarm ratio (FAR) was too high to consider the simulations satisfactory. Concerning the evaluation of disease severity modeling, statistical tests revealed accurate simulations performed by PROCULTURE for susceptible cultivars in 2000 and 2002. By contrast, for weakly susceptible cultivars, the model overestimated disease severity, especially for the upper leaves, for the same period.

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