Effects of tillage operations and plant density on leaf spot disease severity and grain yield of maize in ultisols

2006 ◽  
Vol 7 (1) ◽  
Author(s):  
GO Ihejirika ◽  
MI Nwufo ◽  
EU Onweremadu ◽  
CI Duruigbo
Keyword(s):  
Grain Yield ◽  
Disease Severity ◽  
Leaf Spot ◽  
Plant Density ◽  
Leaf Spot Disease ◽  
Spot Disease ◽  
Tillage Operations

scholarly journals Leaf and canopy reflectance spectrometry applied to the estimation of angular leaf spot disease severity of common bean crops

PLoS ONE ◽  
2018 ◽  
Vol 13 (4) ◽  
pp. e0196072 ◽  
Author(s):  
Víctor Martínez-Martínez ◽  
Jaime Gomez-Gil ◽  
Marley L. Machado ◽  
Francisco A. C. Pinto
Keyword(s):  
Common Bean ◽  
Disease Severity ◽  
Leaf Spot ◽  
Angular Leaf Spot ◽  
Leaf Spot Disease ◽  
Canopy Reflectance ◽  
Reflectance Spectrometry ◽  
Spot Disease

scholarly journals A study of Eggplant Leaf Spot Disease in Greenhouses at Basrah Province

2019 ◽  
Vol 32 ◽  
pp. 182-193
Author(s):  
Yehya A. Salih ◽  
Rusul J. Abdul Ridha
Keyword(s):  
Disease Severity ◽  
Leaf Spot ◽  
Dry Weight ◽  
Control Treatment ◽  
Leaf Spot Disease ◽  
Curvularia Lunata ◽  
Pathogenicity Test ◽  
Spot Disease ◽  
Tomato Cultivars ◽  
First Time

The present study has been conducted to isolate and identify the leaf fungal spot pathogens of eggplant at different regions of Basrah city and their  chemical  control. The results showed that the disease was spread at all regions cultivated with eggplant at Basrah province with infection percentages of 46.6-88.5%. The highest infection percent was recorded at Garmat Ali region (88.5%), while the lowest percent was recorded at the Agricultural station (46.6%). The highest percent of  disease severity (50 %) was recorded at Tomato Cultivars Breeding Project, while the lowest percent was recorded at Agricultural station (20%). Alternaria alternata, Cladosporium oxysporum and Curvularia lunata were isolated from the leaves infected with spot disease, the pathogenicity test revealed that all isolated fungi were pathogenic. C. oxysporum and C. lunata were recorded for the first time in Iraq as causal agents of eggplant leaf spot. The results showed that the fungicide Ortiva inhibited the growth of the fungi with an average of 95.7%, followed by Difecor ( 94.9%), additionally, it was noticed that all examined fungicides completely inhibited the growth of both C. oxysporum and C. lunata ( %100 for each one). The study revealed that the fungicide Ortiva significantly reduced the disease severity of eggplant leaf spot disease up to 11.6% compared with control treatment which was 25%. Finally the results explained that the fungicide Ortiva gave the best protection to eggplant which infected with leaf spot disease compared to the other fungicides, it achieved a best plant height, higher dry weight of shoot and root systems, higher leaf area and higher leaves number. Therefore it is recommended for controlling the spot disease.

scholarly journals Comparative Performance of Chemical and Biological-based Products in Management of Algal Leaf Spot on Magnolia

2020 ◽  
Vol 30 (6) ◽  
pp. 733-740
Author(s):  
Fulya Baysal-Gurel ◽  
Ravi Bika ◽  
Christina Jennings ◽  
Cristi Palmer ◽  
Terri Simmons
Keyword(s):  
Hydrogen Peroxide ◽  
Disease Severity ◽  
Leaf Spot ◽  
Growth Parameters ◽  
Leaf Spot Disease ◽  
Copper Oxychloride ◽  
Spot Disease ◽  
Disease Progress ◽  
Dimethyl Ammonium Chloride ◽  
Dimethyl Ammonium

Magnolia trees (Magnolia sp.) are a popular choice for consumers when choosing flowering woody plants for landscapes. Magnolia species grow in a wide variety of both temperate and tropical locations. Southern magnolia (Magnolia grandiflora) is one of the more popular magnolias due to its pleasing aesthetics: large showy flowers in a range of colors and evergreen foliage. However, magnolias can be affected by algal leaf spot. Algal leaf spot is caused by Cephaleuros virescens, which is a widespread plant parasitic green alga. There has been little research on how to treat algal leaf spot on magnolia plants. This study focuses on identifying effective biological- and chemical-based fungicides for the management of algal leaf spot disease of magnolia plants. Two experiments were conducted in a randomized complete block design with six replications per treatment and a total of 12 treatments, including a nontreated control. The first experiment (Expt. 1) was conducted in a shade house (56% shade) at McMinnville, TN, using southern magnolia plants. The second experiment (Expt. 2) was conducted at a commercial nursery in McMinnvillle, TN, in a field plot planted with ‘Jane’ magnolia (Magnolia liliiflora ‘Nigra’ × Magnolia stellata ‘Rosea’). The algal leaf spot disease severity, disease progression, plant marketability and growth parameters were evaluated. In both experiments, all treatments reduced algal leaf spot disease severity and disease progress in comparison with the nontreated control. In Expt. 1, copper octanoate, copper oxychloride, chlorothalonil water-dispersible granules, chlorothalonil suspension concentrate, didecyl dimethyl ammonium chloride, azoxystrobin + benzovindiflupyr, hydrogen peroxide + peroxyacetic acid, and mono- and di-potassium salts of phosphorus acid + hydrogen peroxide reduced the disease severity and disease progress the most and were not statistically different from one another. In Expt. 2, azoxystrobin + benzovindiflupyr, didecyl dimethyl ammonium chloride, and copper oxychloride significantly reduced disease severity and disease progress (area under disease progress curve). Treatments had no deleterious effect on plant growth parameters such as height and width, and no phytotoxicity of applied treatments or defoliation was observed. Treated magnolia plants had better plant marketability compared with the nontreated control plants. The findings of this study will help growers to achieve better management of algal leaf spot disease on magnolia trees.

scholarly journals Disease Severity of Angular Leaf Spot Disease by Different Inoculation Method and Eco-Friendly Control Efficacy in Strawberry.

2016 ◽  
Vol 20 (1) ◽  
pp. 35-40
Author(s):  
Da-Ran Kim ◽  
Gun-hye Gang ◽  
Hyun-ji Cho ◽  
Hae-Suk Yoon ◽  
In Sik Myoung ◽  
...  
Keyword(s):  
Disease Severity ◽  
Leaf Spot ◽  
Angular Leaf Spot ◽  
Leaf Spot Disease ◽  
Control Efficacy ◽  
Spot Disease ◽  
Inoculation Method

scholarly journals Identification of rhizobacteria that increase yield and plant tolerance to angular leaf spot disease in cucumber

2018 ◽  
Vol 54 (No. 2) ◽  
pp. 67-73 ◽  
Author(s):  
Akköprü Ahmet ◽  
Özaktan Hatice
Keyword(s):  
Disease Severity ◽  
Pseudomonas Syringae ◽  
Leaf Spot ◽  
Root Surface ◽  
Angular Leaf Spot ◽  
Leaf Spot Disease ◽  
Plant Tolerance ◽  
Spot Disease ◽  
System Disease ◽  
Cucumber Yield

The biological control of angular leaf spot disease (ALS) of cucumbers (Cucumis sativus), caused by Pseudomonas syringae pv. lachrymans (Psl), using promising rhizobacteria (RB) and to compare RB efficacy to that of acibenzolar-S-methyl (ASM) was investigated. Effects of ASM and RB isolate Pseudomonas putida AA11/1 that was isolated from the healthy cucumber root surface on disease severity and plant growth were evaluated using ALS-susceptible and tolerant cucumber cultivars in a growth chamber and a soilless growing system. ASM and AA11/1 significantly reduced average disease severity of ALS by 69 and 34% in the susceptible cultivar and 92 and 21% in the tolerant cultivar, respectively. ASM treatment significantly reduced Psl populations, but AA11/1 did not inhibit Psl growth in either cultivar. In the soilless system, disease severity was limited by either ASM or AA11/1, whereas only AA11/1 treatments significantly increased cucumber yield by 68 and 33% in the susceptible and tolerant cultivar, respectively.

scholarly journals Management of Cercospora leaf spot disease of urdbean

2021 ◽  
Vol 17 (2) ◽  
pp. 350-353
Author(s):  
Smita Tiwari ◽  
M.P. Dubey ◽  
P.K. Mishra
Keyword(s):  
Disease Severity ◽  
Leaf Spot ◽  
Foliar Spray ◽  
High Yield ◽  
Leaf Spot Disease ◽  
Cercospora Leaf Spot ◽  
Spot Disease ◽  
Highly Effective

For the management of Cercospora leaf spot of urdbean, seven new fungicides were tested for two year during 2018 and 2019. Of all the chemical tested, foliar spray with Azoxystrobin 8.3% + Mancozeb 66.7% WG and foliar spray with Carbendazim 12% + Mancozeb 63% WP were highly effective and provided less disease severity and high yield of urdbean crop.

scholarly journals Suppression of Bacterial Leaf Spot by Green Synthesized Silica Nanoparticles and Antagonistic Yeast Improves Growth, Productivity and Quality of Sweet Pepper

Plants ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1689
Author(s):  
Eman F. A. Awad-Allah ◽  
Amany H. M. Shams ◽  
Amira A. Helaly
Keyword(s):  
Silica Nanoparticles ◽  
Disease Severity ◽  
Leaf Spot ◽  
Sweet Pepper ◽  
Leaf Spot Disease ◽  
Bacterial Leaf Spot ◽  
Mineral Contents ◽  
Yeast Saccharomyces Cerevisiae ◽  
Spot Disease ◽  
Antagonistic Yeast

Plants are challenged with many kinds of biotic stresses caused by different living organisms, which result in various types of diseases, infections, and damage to crop plants and ultimately affect crop productivity. Plant disease management strategies based on current approaches are necessary for sustainable agriculture. A pot experiment was carried out under greenhouse conditions to evaluate the potential of green synthesized silica nanoparticles (SiO2-NPs) and antagonistic yeast (Saccharomyces cerevisiae) against pepper bacterial leaf spot disease, caused by Xanthomonas vesicatoria. In addition, to assess their efficacy and suppressive effects in reducing disease severity and improving sweet pepper growth, productivity, and quality. Results revealed that the combination of BCA (5%) and SiO2-NPs (150 ppm) was the most effective treatment for reducing disease severity and improving vegetative growth characters, mineral contents (N, P, K, Ca, Mg, and Si in leaves), as well as stimulating polyphenol oxidase (PPO) activity of sweet pepper leaves at 90 days from transplanting, while also at harvesting time enhancing sweet pepper fruit yield quality parameters significantly. In conclusion, green synthesized silica nanoparticles combined with antagonistic yeast have the potential to suppress a bacterial leaf spot disease with ecologically-sound management, while also boosting sweet pepper growth, productivity, and quality.

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