Powdery mildew on winter wheat in Bulgaria, 1980: Relations between disease incidence, disease severity, and yield

1984 ◽  
Vol 90 (2) ◽  
pp. 41-54 ◽  
Author(s):  
T. D. Zaharieva ◽  
W. A. J. Milliano ◽  
J. C. Zadoks
Keyword(s):  
Powdery Mildew ◽  
Winter Wheat ◽  
Disease Severity ◽  
Disease Incidence

scholarly journals Reaction of winter wheat cultivars and breeding lines to Blumeria graminis f.sp. tritici

2010 ◽  
Vol 42 (No. 1) ◽  
pp. 15-20 ◽  
Author(s):  
L. Věchet
Keyword(s):  
Powdery Mildew ◽  
Winter Wheat ◽  
Disease Severity ◽  
Infection Type ◽  
Specific Gene ◽  
Powdery Mildew Fungus ◽  
Breeding Lines ◽  
Resistant Cultivars ◽  
Winter Wheat Cultivars ◽  
Small Plot

During 4 years, 27 cultivars and breeding lines of winter wheat (<i>Triticum aestivum</i>) were tested in small plot experiments for resistance to powdery mildew fungus. The most resistant were Frimegu, RE9607, Runal, Asset, Folke and Wasmo. The cultivars Asta (<i>Pm</i>2,6) and Vlasta (<i>Pm</i>2,6 and another not determined specific gene or minor genes of resistance) fall into resistant cultivars. It seems that the specific genes of resistance <i>Pm</i>2 and <i>Pm</i>6 are still very effective against the present Czech population of powdery mildew on wheat. Resistance of the cultivars Hereward and Tarso, having the gene of resistance <i>Pm</i>8, can be ascribed to an additional undetermined gene that is effective only in mature plants. The cultivars Mikon and Ramiro with partial resistance had a higher infection type and disease severity than resistant cultivars, but lower disease severity than the susceptible cultivar Kanzler.

scholarly journals The Incidence and Seventy of Eyespot on Winter Wheat Variety Hereward Grown as a Monocrop and as a Bicrop With White Clover

1999 ◽  
Vol 4 (1) ◽  
pp. 29
Author(s):  
M.J. Soleimani ◽  
M.L. Deadman ◽  
R.O. Clements ◽  
G. Donaldson
Keyword(s):  
Winter Wheat ◽  
Disease Severity ◽  
Crop Residues ◽  
Disease Incidence ◽  
Wheat Variety ◽  
Wheat Crop ◽  
Spore Dispersal ◽  
The Third ◽  
Progress Curve ◽  
Rain Splash

In a three-year field trial, the level of eyespot on cv. Hereward winter wheat was recorded from cereal monoerops and cereal-clover bicrops receiving standard farming practice and reduced levels of input. Disease incidence (for years one, two and three) and severity (years two and three only), increased with each season in all treatments. In the third wheat crop the area under the disease progress curve (AUDPC) for disease incidence (mean of all treatments) was 3.30 times higher than that measured for the first wheat crop. The average AUDPC for disease severity in year three was l.78 times greater than that for year two. In year three the eyespot incidence AUDPC for bicrops was 1.12 times greater than in monocrops. Disease severity AUDPC in year three was MS times greater in bicrops than in monocrops. For all treatments there was a significant correlation between AUDPC and the rate of disease increase. The results are discussed in terms of those factors that are likely to affect eyespot levels within bicrops, especially microclimate changes, spore production on crop residues, and spore dispersal by rain-splash.

scholarly journals Development of powdery mildew and leaf rust epidemics in winter wheat cultivars

2011 ◽  
Vol 49 (No. 10) ◽  
pp. 439-442
Author(s):  
L. Věchet
Keyword(s):  
Powdery Mildew ◽  
Winter Wheat ◽  
Leaf Rust ◽  
Disease Severity ◽  
Wheat Cultivars ◽  
Winter Wheat Cultivars

Development of powdery mildew and leaf rust epidemics was examined on three winter wheat cultivars with different predispositions to powdery mildew in three-year experiments. The progress of powdery mildew and leaf rust on the same cultivar was conditioned by its dissimilar susceptibility to the respective disease. Fit temperature played an important role at the beginning of the particular disease and during its progress. Significant differences in the disease severity of powdery mildew and leaf rust were recorded on single leaves. Disease severity of leaf rust was higher on upper leaves while disease severity of powdery mildew was higher on lower leaves.

scholarly journals Disease–Weather Relationships for Powdery Mildew and Yellow Rust on Winter Wheat

2008 ◽  
Vol 98 (5) ◽  
pp. 609-617 ◽  
Author(s):  
D. E. Te Beest ◽  
N. D. Paveley ◽  
M. W. Shaw ◽  
F. van den Bosch
Keyword(s):  
Powdery Mildew ◽  
Winter Wheat ◽  
Disease Severity ◽  
Field Experiments ◽  
Yellow Rust ◽  
Influential Factor ◽  
Weather Factors ◽  
Initial Inoculum ◽  
Qualitative Models ◽  
The Uk

Key weather factors determining the occurrence and severity of powdery mildew and yellow rust epidemics on winter wheat were identified. Empirical models were formulated to qualitatively predict a damaging epidemic (>5% severity) and quantitatively predict the disease severity given a damaging epidemic occurred. The disease data used was from field experiments at 12 locations in the UK covering the period from 1994 to 2002 with matching data from weather stations within a 5 km range. Wind in December to February was the most influential factor for a damaging epidemic of powdery mildew. Disease severity was best identified by a model with temperature, humidity, and rain in April to June. For yellow rust, the temperature in February to June was the most influential factor for a damaging epidemic as well as for disease severity. The qualitative models identified favorable circumstances for damaging epidemics, but damaging epidemics did not always occur in such circumstances, probably due to other factors such as the availability of initial inoculum and cultivar resistance.

scholarly journals Evaluation of biological control agents for managing squash powdery mildew under greenhouse conditions

2019 ◽  
Vol 29 (1) ◽  
Author(s):  
Ahmed A. Elsisi
Keyword(s):  
Powdery Mildew ◽  
Disease Severity ◽  
Cucurbita Pepo ◽  
Disease Incidence ◽  
Paenibacillus Polymyxa ◽  
Fruit Weight ◽  
Vegetable Crops ◽  
Fruit Number

AbstractSquash (Cucurbita pepo L.), is one of the most important vegetable crops for human nutriment in Egypt and the world. One of the most serious diseases that infect squash and cause yield losses was powdery mildew, caused by Podosphaera xanthisii. The aim of this study was to investigate the role of Bacillus subtilis, Paenibacillus polymyxa (109 cell ml/1), Trichoderma harzianum, T. album, T. viride and T. hamatum (107 spore ml/l) for controlling disease under greenhouse conditions. Results indicated that all treatments significantly inhibited the conidial germination of P. xanthii than control in vitro and decreased the incidence and disease severity after spraying with the bio-agents on squash plants under greenhouse conditions. The fungicide, Topas-100 (10.0% penconazole “w/v” [(R,S-1-(2-(2,4-dichlorophenyl)-Q pentyl)-1H-1,2,4-triazole]), followed by B. subtilis was highly significant for decreasing disease incidence (2.8 and 5.3%, respectively) and disease severity percentage (3.5 and 4.8%, respectively) than the control. The activities of biochemical changes, i.e., peroxidase, polyphenol oxidase, and total phenols, were significantly upregulated as results of most treatments. Also, bio-agent treatments caused significant increase in yield characteristics of squash plants such as fruit number/plant and fruit weight/plant than control. B. subtilis recorded the highest increase (110.9% and 98.7%) in fruit number and fruit weight/plant than control.

Impact of the estimated doses of mineral fertilizers on the infestation mildew, pyrenophora and yield of winter wheat varieties

2020 ◽  
Author(s):  
A.Y. Ozheredova ◽  
◽  
A. N. Esaulko ◽  
L.A. Mikhno ◽  
A.P. Shutko ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Winter Wheat ◽  
Mineral Fertilizers ◽  
Wheat Varieties ◽  
Leached Chernozem ◽  
Winter Wheat Varieties

The article presents materials on the influence of calculated doses of mineral fertilizers on the incidence of powdery mildew, pyrenophorosis and yield of winter wheat varieties cultivated on leached Chernozem for 2016-2018.

Effect of precursors, fertilizers and soil cultivation on the phytosanitary condition of winter wheat crops in the zone of the Left Bank Forest-Steppe

2017 ◽  
Vol 1 (92) ◽  
pp. 100-108
Author(s):  
T.S. Vinnichuk ◽  
L.M. Parminskaya ◽  
N.M. Gavrilyuk
Keyword(s):  
Powdery Mildew ◽  
Winter Wheat ◽  
Root Rot ◽  
Forest Steppe ◽  
Left Bank ◽  
Soil Cultivation ◽  
No Till ◽  
Harmful Organisms

In the article the research the results of studies of the phytosanitary state of winter wheat sowing with three soil treatments - plowing (22-24 cm), shallow (10-12 cm) and zero (no - till) with various doses of fertilizers: N56 Р16 К16 , N110-130 Р90 К110 and N145-165 Р135 К150 , without fertilizers (control) for the two predecessors - soybean and rapeseed. The influence of these methods on the development and prevalence of powdery mildew, septoriosis of leaves, root rot of winter wheat, the most common pests in the area of research - cereal flies, wheat thrips and grain sawflies. The identified measures to limit the development and spread of harmful organisms above.

Influence of sowing dates on the incidence of powdery mildew of chilli

2017 ◽  
Vol 4 (2) ◽  
Author(s):  
SUDHEENDRA A. ASHTAPUTRE
Keyword(s):  
Powdery Mildew ◽  
Field Experiment ◽  
Disease Severity ◽  
Agricultural Research ◽  
Time Interval ◽  
Research Station ◽  
Inoculum Potential ◽  
Weather Factors ◽  
Agricultural Research Station ◽  
Sowing Dates

A field experiment was conducted during kharif, 2005 at Agricultural Research station, Devihosur, Haveri, Karnataka to assess the progress of powdery mildew at different time interval of sowing dates. Totally 20 different dates of sowings were imposed in the experiment at an interval of 10 days. The crop sown on last week of May to mid of June recorded minimum disease severity compared to rest of the date of sowings. This clearly indicated that crop sown during this period suffers less, which may be due to low inoculum potential, whereas late sown crop suffers more because of the readily available inoculum in the early sown crops. Low disease severity in last week of May to mid of June sowing may be attributed to the non-congenial weather factors for the development of the disease.

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