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Showing 4 results for Root Rot

Bita Naseri,
Volume 5, Issue 2 (8-2016)

Naseri  B. 2016. Integrated  management of Rhizoctonia root rot of bean. Plant Pathology Science 5(2):42-51.

Rhizoctonia root rot caused by Rhizoctonia solani Kühn seriously reduces bean yield. Restricting wide distribution of the disease in main bean growing regions requires identification of factors effect on the disease occurrence and prevalence. Due to the lack of resistant cultivars and ineffective chemical control measures, cultural practice management plays an important role in disease control. According to the findings, increasing soil organic matter, improving rhizoobial nodule formation on root, not planting beans in sandy soils, maintaining nuteral pH of field soil, following 7-9 days irrigation interval throughout growing season, planting standard density of 30 plants per square meter, seeding at less than five cm depth under warm and dry climatic conditions, using sprinkler irrigation, growing red bean in infected fields, appropriate rotation program, applying maximum 50 kg/ha urea, weed control, and seed treatment with proper systemic fungicide should be considered in an integrated management program.

Sepideh Fekrikohan, Reza Mostowfizadeh-Ghalamfarsa,
Volume 8, Issue 2 (9-2019)

Fekrikohan S and MostowfizadehGhalamfarsa R (2019) Integrated management of diseases caused by graminicolous fungi. Plant Pathology Science 8(2):58-69.
DOI: 10.2982/PPS.8.2.58
Wheat is one of the most important cereals grown as human and animal food in the world, including Iran. This crop is infected by various pathogens such as fungi. Graminicolous fungi are important pathogens which cause root and crown rot, leaf blight and black spot on wheat. Some methods, with high efficiency and safety for human and environment, have been employed for controlling these diseases. Since the activity of these fungi depends on some factors such as soil temperature, pH, moisture and nutrients, the proper agricultural practices before planting and suitable irrigation and good fertilization would be effective in pathogen control. Various species of Trichoderma, arbuscular endomycorrhizal fungi and some bacterial species may control the disease through some mechanisms such as biofilm production, plant growth promotion and enzyme production. Generally, integrated management with the aid of simultaneous application of several control measures would give the best results.

Maryam Mirderikvand, Mostafa Darvishnia, Eidy Bazgir, Samira Pakbaz,
Volume 10, Issue 1 (2-2021)

Mirderikvand M, Darvishnia M, Bazgir E, Pakbaz S (2021) Introduction of Fusarium species associated with crown and root of canola in Lorestan Province of Iran. Plant Pathology Science 10(1):64-75.     Doi: 10.2982/PPS.10.1.64.
Introduction: Canola is one of the most important oilseeds in the world. Fusarium species can causes of canola root and crown rot. Material and Methods: In order to identify Fusarium species associated with rapeseed, some samples of the roots and crown of infected and suspicious plants were taken from rapeseed fields in the counties of Lorestan Province during the 2018 growing season. The samples were transferred to the laboratory and pathogenic fungi isolated and purified using specific and public media and then identified with valid keys. Results: A total of 88 isolates were obtained from the collected samples, which due to the morphological characteristics as F. acuminatum, F. culmorum, F. diversisporum, F. oxysporum, F. sambucinum, and F. solani. F. culmorum with 21 isolates (23.86%) and F. solani with 7 isolates (7.95%) had the highest and lowest frequency percentage, respectively. Conclusion: Canola is reported for the first time as a new host for F. diversisporum and F. sambucinum in Iran.

Nafiseh Hesami, Mostafa Darvishnia, Eidi Bazgir,
Volume 10, Issue 2 (9-2021)

Hesami N, Darvishnia M, Bazgir E (2021) Reaction of nine bean cultivars to two  Fusarium species. Plant Pathology Science 10(2):93-104.   
  Doi: 10.2982/PPS.10.2.93.
Introduction: Two soil-borne fungi, Fusarium oxysporum and F. solani, are the causes of important diseases of beans wilting and root rot. The best way to manage these diseases is to identify and cultivate resistant cultivars. This study was conducted to identify the reaction of nine Iranian beans cultivars to these two pathogenic fungi. Materials and Methods: Bean-diseased plants were collected from farms in Aligudarz city in Lorestan province, in western Iran, and F. oxysporum and F. solani were isolated from them in the laboratory. At first the pathogenesis of these fungi was investigated on a local cultivar. Then, the reaction of nine bean cultivars to them was determined in a completely randomized design experiment in the greenhouse. Results: Reaction of cultivars to F. oxysporum and F. solani respectively were, Dadfar red-bean with disease severity of 28.8 and 26.6%, Sayad red-bean  with 33.3 and 28.8%, Koosha pinto-bean  with 35.5 and 33.3%, White 247 with 40 and 37.8%, Pak white-bean with 46.6 and 46.7% and pinto-bean 492 with 48.8 and 46.7% respectively, were grouped as semi-sensitive. Saleh pinto-bean with a disease severity of 64.4 and 62.2%, Yaghot red-bean  with 77.7 and 80% and Almas white with 82.2 and 86.7% respectively, were determined as sensitive. Pearson correlation analysis also showed that there was a significant negative correlation between root length, fresh and dry weight of root with diseases severity. Conclusion: Six cultivars of Iranian beans vs Dadfar, Sayad, Koosha, White247, Pak and 492 are semi-sensitive to these diseases.

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