scholarly journals Incidence and severity of Septoria leaf blotch in winter wheat in relation to reduced dosage of fungicides

2017 ◽  
Vol 38 (SI 2 - 6th Conf EFPP 2002) ◽  
pp. 652-655
Author(s):  
I. Gaurilčikienė
Keyword(s):  
Winter Wheat ◽  
Flag Leaf ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch ◽  
Triazole Fungicides ◽  
Yield Increase ◽  
Highly Effective ◽  
Full Dosage

The trials were carried out over the period 1999–2000 with a view to testing the efficacy of reduced doses of triazole fungicides on winter wheat cv. Zentos. Septoria diseases (Septoria spp.) occurred on winter wheat annually. Full and reduced dosages of fungicides were highly effective against Septoria leaf blotch at an early milk stage, especially on flag leaf. Later the efficacy of reduced dosages of the fungicides was lower, than that of full doses. Due to full dosage of fungicides we obtained a sufficient yield increase annually. The yield increase through the use of 3⁄4 reduced doses was lower. But yield increase through reduced dosage to 1⁄2 was low and insufficient.

scholarly journals Revisiting Fungicide-Based Management Guidelines for Leaf Blotch Diseases in Soft Red Winter Wheat

Plant Disease ◽  
2015 ◽  
Vol 99 (10) ◽  
pp. 1434-1444 ◽  
Author(s):  
K. T. Willyerd ◽  
C. A. Bradley ◽  
V. Chapara ◽  
S. P. Conley ◽  
P. D. Esker ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Flag Leaf ◽  
Analytical Models ◽  
Yield Response ◽  
Yield Data ◽  
Leaf Blotch ◽  
Yield Increase ◽  
Fungicide Application ◽  
Soft Red Winter Wheat ◽  
Red Winter Wheat

Standard foliar fungicide applications in wheat are usually made between flag leaf emergence (Feekes [FK] 8) and heading (FK10.5) to minimize damage to the flag leaf. However, over the last few years, new fungicide programs such as applications prior to FK8 and split half-rate applications have been implemented, although there are few data pertaining to the efficacy of these programs. Eight experiments were conducted in Illinois, Indiana, Ohio, and Wisconsin from 2010 to 2012 to compare new programs to standard FK8 and FK10 programs in terms of disease control and yield response. The programs evaluated consisted of single full-rate applications of 19% tebuconazole + 19% prothioconazole (Prosaro) or 23.6% pyraclostrobin (Headline) at FK5 (pseudostem strongly erected), FK8, or FK10, or split half rates at FK5 and 8 (FK5+8), plus an untreated check (CK). Leaf blotch (LB) severity and yield data were collected and random effects meta-analytical models fitted to estimate the overall log odds ratio of disease reaching the flag leaf ([Formula: see text]) and mean yield increase ([Formula: see text]) for each fungicide program relative to CK. For all programs, [Formula: see text] was significantly different from zero (P < 0.05). Based on estimated odds ratios (OR = exp[[Formula: see text]]), the two FK8 programs reduced the risk of LB reaching the flag leaf by 55 and 75%, compared with 62 and 69% and 67 and 70% for the two FK10 and FK5+8 programs, respectively, and only 32 and 37% for the two FK5 programs. [Formula: see text] was significantly different from zero (P ≤ 0.003) for all FK8, FK10, and FK5+8 programs, with values of 233 and 245, 175 and 220, and 175 and 187 kg ha−1 for the FK10, FK5+8, and FK8 programs, respectively. Differences in mean yield response between Headline and Prosaro were not statistically significant (P > 0.05). The probability of profitability was estimated for each program for a range of grain prices and fungicide application costs. All FK8, FK10, and FK5+8 programs had more than an 80% chance of resulting in a positive yield response, compared with 63 and 67% for the two FK5 programs. The chance of obtaining a yield increase of 200 kg ha−1, required to offset an application cost of $36 ha−1 at a grain price of $0.18 kg−1, ranged from 44 to 60% for FK8, FK10 and FK5+8 programs compared with 22 and 25% for the two FK5 programs. These findings could be used to help inform fungicide application decisions for LB diseases in soft red winter wheat.

scholarly journals The assessment of the influence of the Gumiton organomineral complex on the development of root rot and structural elements of the winter wheat yield

2021 ◽  
Vol 32 ◽  
pp. 02012
Author(s):  
Aleksey Suslov ◽  
Dimitry Sviridenk ◽  
Vasiliy Mamayev ◽  
Irina Sychiova
Keyword(s):  
Winter Wheat ◽  
Root Rot ◽  
Flag Leaf ◽  
Wheat Yield ◽  
Nitrogen Fertilizers ◽  
High Yield ◽  
Yield Increase ◽  
Organic Mineral ◽  
Organomineral Complex ◽  
Rot Disease

It has been shown that pre-sowing treatment increases field germination by 5.5%, and the preservation of plants after overwintering increases by 4.3%. Gumiton strengthened the work of the assimilation apparatus of the flag leaf due to an increase in leaf area by 29.3-49.1% and extended the life of plants. As a part of a tank mixture (Tabu Super, 1.5 l / t + Tertia, 2.5 l t), the drug allowed to reduce the prevalence of the root rot disease to 2.45-1.05% in comparison with the control. The organomineral complex provided the formation of a larger and more leveled grain with a mass of 1000 grains of 47.0-47.5 g, 43.9 g in the control; the grain nature is more than 780 g / dm 3, 751.7 g / dm 3, in the control. The use of Gumiton (seeds + tillering + piping) against the background of N 96 P 96 K 96 provided a high yield increase by 37.8%. To reduce the expenses of foliar fertilization with nitrogen fertilizers, the Gumiton organic-mineral complex should be recommended, since it is an element of greening in intensive technologies of winter wheat cultivation.

A predictive model for early-warning of Septoria leaf blotch on winter wheat

2009 ◽  
Vol 124 (3) ◽  
pp. 413-425 ◽  
Author(s):  
D. E. te Beest ◽  
M. W. Shaw ◽  
S. Pietravalle ◽  
F. van den Bosch
Keyword(s):  
Winter Wheat ◽  
Predictive Model ◽  
Early Warning ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch

scholarly journals Operational application and improvements of the disease risk forecast model PROCULTURE to optimize fungicides spray for the septoria leaf blotch disease in winter wheat in Luxembourg

2008 ◽  
Vol 2 (1) ◽  
pp. 57-60 ◽  
Author(s):  
J. Junk ◽  
K. Görgen ◽  
M. El Jarroudi ◽  
P. Delfosse ◽  
L. Pfister ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Disease Risk ◽  
Meteorological Data ◽  
Weather Prediction ◽  
Wrf Model ◽  
Leaf Wetness ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch ◽  
Phenological Data ◽  
Spatial Coverage

Abstract. The model PROCULTURE has been developed by the Université Catholique de Louvain – UCL (Belgium) to simulate the progress of the septoria leaf blotch disease on winter wheat during the cropping season. The model has been validated in Luxembourg for four years at four distinct representative sites. It is able to identify infection periods due to the causal agent Mycosphaerella graminicola on the last five leaf layers by combining meteorological data with phenological data from PROCULTURE's crop growth model component. The meteorological forcing consists of hourly time-series of air temperature, relative humidity and cumulative rainfall since the time of sowing, retrieved from automatic weather stations for hindcast and numerical weather prediction model outputs for the forecast periods. In order to improve the model, leaf wetness – which is one of the most important drivers for the spread of the disease – shall be added as an additional predictor. Therefore leaf wetness sensors were set up at four test sites during the 2007 growing season. To get a continuous spatial coverage of the country, it is planned to couple the PROCULTURE model offline to 12-hourly operational weather forecasts from an implementation of the Weather Research and Forecasting (WRF) model for Luxembourg at 1 km resolution. Because the WRF model does not provide leaf wetness directly, an artificial neural network (ANN) is used to model this parameter.

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.

Effect of temperature on latent period of septoria leaf blotch on winter wheat under outdoor conditions

2004 ◽  
Vol 53 (2) ◽  
pp. 170-181 ◽  
Author(s):  
D. J. Lovell ◽  
T. Hunter ◽  
S. J. Powers ◽  
S. R. Parker ◽  
F. Van den Bosch
Keyword(s):  
Winter Wheat ◽  
Latent Period ◽  
Effect Of Temperature ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch

scholarly journals Tolerance of septoria leaf blotch in winter wheat

2004 ◽  
Vol 53 (1) ◽  
pp. 1-10 ◽  
Author(s):  
S. R. Parker ◽  
S. Welham ◽  
N. D. Paveley ◽  
J. Foulkes ◽  
R. K. Scott
Keyword(s):  
Winter Wheat ◽  
Septoria Leaf Blotch ◽  
Leaf Blotch
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