scholarly journals Biocontrol strategies to reduce the impact of Septoria tritici blotch in wheat

2020 ◽  
Vol 119 (2) ◽  
pp. 060
Author(s):  
Cristina Cordo ◽  
Rodrigo Altamirano ◽  
María Rosa Simón ◽  
Marina Stocco ◽  
Gladys Lampugnani ◽  
...  
Keyword(s):  
Field Experiments ◽  
Foliar Application ◽  
Wheat Yield ◽  
Plant Diseases ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Growth Stages ◽  
Progress Curve ◽  
The Impact ◽  
Coated Seed

Trichoderma strains are used as biofungicides for some plant diseases. The aim of this research was to evaluate the effectiveness of Trichoderma harzianum isolates, applied alone and in combination with fungicides, to control Zymoseptoria tritici, the causal agent of Septoria tritici blotch of wheat, and their impact on wheat yield and its components. To this end, field experiments were performed in 2010 and 2011 and 10 different treatments were applied. The disease severity was assessed by visual estimation of the leaf area affected by Z. tritici at the first node, anthesis and early dough growth stages. The best results for reducing the area under the disease progress curve (AUDPC) were “coated seed only with T. harzianum” and “coated seed plus two foliar application of T. harzianum”. Regarding the increase in yield gain and the improvement of yield components, the fungicide treatment applied at seedling, and tillering in 2011 provided significant increase. Respect the treatments with the application of T. harzianum the best was only one application as coated seed of the biocontroler alone showing yield responses similar to the ones obtained with the fungicide treatments. We recommended the coated seed alone because the protective effect lasts until the early dough stage of ripening. This application produced a comparable yield to that obtained with three applications of T. harzianum at different phenological stages of wheat with as well as with more than one application of commercial fungicide. We found a strong relationship between the number of kernels per spike and the wheat yield in 2011 as a consequence of the best environmental conditions for the disease’s occurrence. Contrary, it was shown a non-significant association between thousand kernel weight (TKW) and the wheat yield.

scholarly journals Fungicide timing for the control of septoria tritici blotch of wheat

2006 ◽  
Vol 59 ◽  
pp. 160-165 ◽  
Author(s):  
M.V. Marroni ◽  
S.L.H. Viljanen-Rollinson ◽  
R.C. Butler ◽  
Y. Deng
Keyword(s):  
Disease Control ◽  
Field Trial ◽  
Growth Stage ◽  
Good Control ◽  
Growing Season ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Disease Models ◽  
Growth Stages ◽  
Progress Curve

A field trial during the 200506 growing season used different fungicides and timing of fungicide applications to manipulate the development of Septoria tritici blotch on artificiallyinoculated wheat (cv Consort) Disease severity was assessed once or twice a week and the area under the disease progress curve (AUDPC) calculated The fungicide azoxystrobin applied at the prestem extension stage of crop growth had the lowest AUDPC and provided the best level of protection against the disease on the top three leaves Good control of the disease was also obtained from prestem extension and stemextension (growth stage GS32) applications of a mixture of azoxystrobin and epoxiconazole Epoxiconazole applied at the prestem extension stage and azoxystrobin and epoxiconazole mixture applied at growth stages 37 and 39 did not provide adequate control of the disease This work is part of a project aiming to provide information for development of disease models and forecast systems to assist growers with disease control decisions

Effect of water stress and NaCl triggered changes on yield, physiology, biochemistry of broad bean (Vicia faba) plants and on quality of harvested pods

Biologia ◽  
2014 ◽  
Vol 69 (8) ◽  
Author(s):  
Georgia Ouzounidou ◽  
Ilias Ilias ◽  
Anastasia Giannakoula ◽  
Ioanna Theoharidou
Keyword(s):  
Water Stress ◽  
Field Experiments ◽  
Broad Bean ◽  
Foliar Application ◽  
Water Control ◽  
Simultaneous Exposure ◽  
Ameliorative Effect ◽  
Normal Water ◽  
The Impact

AbstractSalinity and drought are the most important abiotic stresses affecting crop yield. Broad bean was chosen as model plant for assessing the impact of salt stress and its interaction with drought in the field experiments. The factors examined in the experiments were the two irrigation rates (normal watering — NW with 3 L plant−1 and drought — D) and three salinity rates imposed by foliar application (0, 50, 100 mg L−1 NaCl). Highest NaCl level with normal water irrigation caused maximum reduction in plant height and production, which it was due to photosynthetic disturbances. Salt injuries were alleviated by increasing water stress. The control plants exposed to NaCl lost their ability over water control. The increased malondialdehyde (MDA) and H2O2 indicate the prevalence of oxidative stress due to salinity. The levels of proline and carbohydrates were higher under salinity alone than under simultaneous exposure to drought and NaCl. The protein concentration of immature and mature broad bean pods was more inhibited more by NaCl supply than by drought alone. The combination of drought and NaCl resulted in a significant increase in proteins, glucose, fructose and sucrose content. Overall, the ameliorative effect of drought under NaCl supply was quantified.

The interaction between soil pH and phosphorus for wheat yield and the impact of lime-induced changes to soil aluminium and potassium

Soil Research ◽  
2017 ◽  
Vol 55 (4) ◽  
pp. 341 ◽  
Author(s):  
Craig A. Scanlan ◽  
Ross F. Brennan ◽  
Mario F. D'Antuono ◽  
Gavin A. Sarre
Keyword(s):  
Grain Yield ◽  
Soil Ph ◽  
Field Experiments ◽  
Wheat Yield ◽  
Acid Soils ◽  
Combined Effect ◽  
Additive Effect ◽  
Yield Response ◽  
Response Curves ◽  
The Impact

Interactions between soil pH and phosphorus (P) for plant growth have been widely reported; however, most studies have been based on pasture species, and the agronomic importance of this interaction for acid-tolerant wheat in soils with near-sufficient levels of fertility is unclear. We conducted field experiments with wheat at two sites with acid soils where lime treatments that had been applied in the 6 years preceding the experiments caused significant changes to soil pH, extractable aluminium (Al), soil nutrients and exchangeable cations. Soil pH(CaCl2) at 0–10cm was 4.7 without lime and 6.2 with lime at Merredin, and 4.7 without lime and 6.5 with lime at Wongan Hills. A significant lime×P interaction (P<0.05) for grain yield was observed at both sites. At Merredin, this interaction was negative, i.e. the combined effect of soil pH and P was less than their additive effect; the difference between the dose–response curves without lime and with lime was greatest at 0kgPha–1 and the curves converged at 32kgPha–1. At Wongan Hills, the interaction was positive (combined effect greater than the additive effect), and lime application reduced grain yield. The lime×P interactions observed are agronomically important because different fertiliser P levels were required to maximise grain yield. A lime-induced reduction in Al phytotoxicity was the dominant mechanism for this interaction at Merredin. The negative grain yield response to lime at Wongan Hills was attributed to a combination of marginal soil potassium (K) supply and lime-induced reduction in soil K availability.

scholarly journals Influence of meteorological parameters on wheat yield under different sowing conditions

MAUSAM ◽  
2022 ◽  
Vol 73 (1) ◽  
pp. 161-172
Author(s):  
ANANTA VASHISTH ◽  
DEBASISH ROY ◽  
AVINASH GOYAL ◽  
P. KRISHNAN
Keyword(s):  
Relative Humidity ◽  
Soil Temperature ◽  
Air Temperature ◽  
Field Experiments ◽  
Wheat Yield ◽  
Weather Condition ◽  
Grain Filling ◽  
Crop Growth ◽  
Leaf Water ◽  
Growth Stages

Field experiments were conducted on the research farm of IARI, New Delhi during Rabi 2016-17 and 2017-18. Three varieties of wheat (PBW-723, HD-2967 and HD-3086) were sown on three different dates for generating different weather condition during various phenological stages of crop. Results showed that during early crop growth stages soil moisture had higher value and soil temperature had lower value and with progress of crop growth stage, the moisture in the upper layer decreased and soil temperature increased significantly as compared to the bottom layers. During tillering and jointing stage, air temperature within canopy was more and relative humidity was less while during flowering and grain filling stage, air temperature within canopy was less and relative humidity was more in timely sown crop as compared to late and very late sown crop. Radiation use efficiency and relative leaf water content had significantly higher value while leaf water potential had lower value in timely sown crop followed by late and very late sown crop. Yield had higher value in HD-3086 followed by HD-2967 and PBW-723 in all weather conditions. Canopy air temperature difference had positive value in very late sown crop particularly during flowering and grain-filling stages. This reflects in the yield. Yield was more in timely sown crop as compared to late and very late sown crop.  

scholarly journals A Microbial Fermentation Mixture Reduces Fusarium Head Blight and Promotes Grain Weight but does not impact Septoria tritici blotch

2021 ◽  
Author(s):  
Tony Twamley ◽  
Mark Gaffney ◽  
Angela Feechan
Keyword(s):  
Fusarium Head Blight ◽  
Fungal Pathogens ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Microbial Fermentation ◽  
In Planta ◽  
Head Blight ◽  
Zymoseptoria Tritici ◽  
The Impact

AbstractFusarium graminearum and Zymoseptoria tritici cause economically important diseases of wheat. F. graminearum is one of the primary causal agents of Fusarium head blight (FHB) and Z. tritici is the causal agent of Septoria tritici blotch (STB). Alternative control methods are required in the face of fungicide resistance and EU legislation which seek to cut pesticide use by 2030. Both fungal pathogens have been described as either hemibiotrophs or necrotrophs. A microbial fermentation-based product (MFP) was previously demonstrated to control the biotrophic pathogen powdery mildew, on wheat. Here we investigated if MFP would be effective against the non-biotrophic fungal pathogens of wheat, F. graminearum and Z. tritici. We assessed the impact of MFP on fungal growth, disease control and also evaluated the individual constituent parts of MFP. Antifungal activity towards both pathogens was found in vitro but MFP only significantly decreased disease symptoms of FHB in planta. In addition, MFP was found to improve the grain number and weight, of uninfected and F. graminearum infected wheat heads.

scholarly journals Development and Evaluation of a Leaf Disease Damage Extension in Cropsim-CERES Wheat

Agronomy ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 120 ◽  
Author(s):  
Georg Röll ◽  
William Batchelor ◽  
Ana Castro ◽  
María Simón ◽  
Simone Graeff-Hönninger
Keyword(s):  
Sensitivity Analysis ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Mean Squared Error ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Extended Model ◽  
Simple Method ◽  
Area Index ◽  
The Impact

Developing disease models to simulate and analyse yield losses for various pathogens is a challenge for the crop modelling community. In this study, we developed and tested a simple method to simulate septoria tritici blotch (STB) in the Cropsim-CERES Wheat model studying the impacts of damage on wheat (Triticum aestivum L.) yield. A model extension was developed by adding a pest damage module to the existing wheat model. The module simulates the impact of daily damage on photosynthesis and leaf area index. The approach was tested on a two-year dataset from Argentina with different wheat cultivars. The accuracy of the simulated yield and leaf area index (LAI) was improved to a great extent. The Root mean squared error (RMSE) values for yield (1144 kg ha−1) and LAI (1.19 m2 m−2) were reduced by half (499 kg ha−1) for yield and LAI (0.69 m2 m−2). In addition, a sensitivity analysis of different disease progress curves on leaf area index and yield was performed using a dataset from Germany. The sensitivity analysis demonstrated the ability of the model to reduce yield accurately in an exponential relationship with increasing infection levels (0–70%). The extended model is suitable for site specific simulations, coupled with for example, available remote sensing data on STB infection.

scholarly journals Wheat Yield Responses to Rising Temperature: Insights from North Indian Plains of India

2021 ◽  
Author(s):  
Philip Kuriachen ◽  
Asha Devi ◽  
Anu Susan Sam ◽  
Suresh Kumar ◽  
Jyoti Kumari ◽  
...  
Keyword(s):  
Climate Change ◽  
Management Practices ◽  
Climatic Factors ◽  
Technological Development ◽  
Wheat Yield ◽  
Significant Rise ◽  
Yield Reduction ◽  
Growth Stages ◽  
Annual Increment ◽  
The Impact

Abstract Climate change and consequent variations in temperature pose a significant challenge for sustaining wheat production systems globally. In this study, the potential impact of rising temperature on wheat yield in the north Indian plains, India's major wheat growing region, was analyzed using panel data from the year 1981 to 2009. This study deviates from the majority of the previous studies by including non-climatic factors in estimating the impact of climate change. Two temperature measures were used for fitting the function, viz., Growing Season Temperature (GST) and Terminal Stage Temperature (TST), to find out the differential impact of increased temperature at various growth stages. Analysis revealed that there was a significant rise in both GST as well as TST during the study period. The magnitude of the annual increment in TST was twice that of GST. Wheat yield growth in the region was driven primarily by increased input resources such as fertilizer application and technological development like improved varieties and management practices. Most importantly, the study found that the extent of yield reduction was more significant for an increase in temperature at terminal crop growth stages. The yield reduction due to unit increase in TST was estimated to be 2.26 % while rise in GST by 1◦C resulted in yield reduction of 2.03%.

scholarly journals Evaluation of septoria (Septoria nodorum) tolerance in wheat varieties

2020 ◽  
Vol 29 (1) ◽  
pp. 100-106
Author(s):  
Dagiimaa Ivanov ◽  
Otgonbayar Baasansuren ◽  
Mayagmarsuren Yadamsuren ◽  
Ulziisaikhan Davaasambuu
Keyword(s):  
Block Design ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Septoria Nodorum ◽  
Wheat Varieties ◽  
Disease Progress ◽  
Progress Curve ◽  
Randomized Block Design ◽  
Disease Rating ◽  
Other World

Septoria tritici blotch (STB) caused by the ascomycete fungus Mycosphaerella graminicola (anamorph S. tritici) is currently one of the most serious foliar disease of wheat in Mongolia and other world regions characterized by temperate and wet environment during growing season. Fifty-one  wheat genotypes with different resistance levels were evaluated in natural conditions for their reaction to S. tritici attack during 2017-2019 year. The experimental design was a randomized block design with two replications. Disease rating was visually recorded by using the scale (0-9) in two different times and crop stages (Z53-1/4 head out and Z70-milk development). There were also calculated the Septoria Progress Coefficient (SPC) and Area under Disease Progress Curve (AUDPC) for each wheat genotype evaluated. SPC was low for the higher genotypes comparatively with the shortest ones leading to the conclusion that disease progress is higher as plant height is low (r=-0.96**). The same aspect was also emphasized by the waek correlation between plants height and disease progress height (r=0.28**).The shortest genotypes showed higher necrosis percentage and AUDPC values. There was also a correspondence between genotype susceptibility and AUDPC showing that the most susceptible wheat cultivars recorded higher AUDPC values. The highest AUDPC values while Darkhan-201 (131), Darkhan-218 (163) and Omskau-36 (82) had the best resistance reaction to S. tritici attack. Зусах буудайн сортуудад септориоз (Septoria nodorum) өвчний тэсвэрлэлтийг үнэлсэн дүн Сүүлийн үеийн газар тариалангийн менежмент болон практик арга нь ээлжлэн тариалалтын сэлгээг баримтлахгүй жил дараалан үр тарианы ургамлыг тариалах болсон зэрэг нь навчны өвчлөл болон түрүүний өвчлөл ихсэх зүй тогтол ажиглагдаж байна. Талбайн нөхцөлд нийт 51 сортод септориоз өвчин тэсвэрлэлтийн үнэлгээг ерөнхий мөрддөг 0-9 баллаар буудайн түрүүлэлтээс, сүүн болц хүртлэх хугаанд ажиглалт хэмжилт хийсэн. Септориозийн тархалтын коэффициент (SPC), өвчний тархалтын муруй (AUDPC)-г тооцолсон. Септориоз өвчин тэсвэрээр Дархан-201, Дархан-217, Омская-36 сортууд тэсвэртэй ангилалд хамаарагдаж байна. Тэсвэртэй сортууд нь өртөмтгий сортууд өвчлөлийн хувьд 81.0-737.7 хэлбэлзэл ихтэй нь сортуудын хооронд ялгаа их байгааг өвчний тархалтын муруй нь (AUDPC) –ийн утга харуулж байна. Өвчний тархалтын муруй (AUDPC) нь ургамлын өндөр болон өвчлөлтийн өндрийн хязгаар (r=-0.78**) сөрөг хамааралтай. Харин  өвчний тархалтын хувь нь септориозийн тархалтын коэффициент (r=0.789**), өвчлөлтийн өндрийн хязгаартай (r=0.651**) нягт хамааралтай байна. Септориоз өвчний хор хөнөөлийн коэффициентыг гаргахад ургацыг 22.4-67.2%-иар бууруулаж байна. Септориоз өвчний халдвар ихсэх тусам ургацын бууралт нэмэгдэх зүй тогтол ажиглагдаж байна.  Түлхүүр үг: AUDPC, септориоз, өвчин тэсвэрлэлт, сорт

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