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Ali Rostami, Mehdi Sadravi, Mr Rasool Rezaee, Mohammad Abdollahi,
Volume 9, Issue 2 ((Spring and Summer) 2020)

Rostami A, Sadravi M, Rezaei R, Abdollahi M (2020) Biological control of Fusarium root rot of bean with two Trichoderma species and Pseudomonas fluorescens. Plant Pathology Science 9(2): 14-27.  Doi: 10.2982/PPS.9.2.14
Introduction: Fusarium root rot with damage reported up to 85% of the crop yield, caused by Fusarium solani f. sp. phaseoli, is one of the most important bean diseases in the world. Biological control is a healthy and environmentally friendly way to manage this soil-borne disease. Materials and Methods: Bean farms in Kohgiluyeh and Boyer-Ahmad Province were visited and the rotten roots of diseased plants were sampled. Two isolates of the pathogen were isolated, purified and identified. The pathogenicity of these two isolates was tested on two bean varieties Drakhshan and Pak under greenhouse conditions. The colony growth inhibition rate of the hypervirulant isolate of the pathogen was assessed by 14 native isolates of Trichoderma harzianum, four isolates of Trichoderma virens, two isolates of Trichoderma atroviridae, and five native isolates of Pseudomonas florescens and P. florescens CHAO with hyperparasitic ability and production of antibiotics in vitro. Finally, the effect of four superior T. harzianum isolates, one T. atroviridae isolate and two P. florescens isolates on disease severity were examined in a completely randomized design in the greenhouse. Results: All isolates of three species of Trichoderma had the ability to hyperparasite and destroy pathogenic hyphae. Four T. harzianum isolates showed a more significant ability to produce non-volatile and volatile antibiotic materials. All treatments significantly reduced the disease severity, but a T. harzianum isolate was more effective in vivo. Conclusion: Fusarium root rot is also found in bean fields in southwestern Iran. Native isolates of T. harzianum, T. virens and T. atroviridae have the hyperparasitic ability on the pathogen. These fungi and isolates of P. florescens have the ability to inhibit the growth of the pathogen colony by producing antibiotic substances. Isolates of Trichoderma harzianum, T. atroviridae and P. florescens CHAO have the ability to reduce the severity of the disease in vivo.

Former Ms.c. Saeed Sharify Rostam-Abady, Dr. Mahdieh Rostami, Dr. Farahnaz Jahanshahi Afshar, Fariba Ardeshir,
Volume 12, Issue 1 ((Autumn & Winter) 2023)

Sharify Rostam-Abadi, S., Rostami, M., Jahanshahi Afshar, F., Ardeshir, F. (2023).  Three plant-parasitic nematodes of the family Longidoridae from orchards of Rafsanjan county, Iran. Plant Pathology Science 12(1),12-24.  
 Doi: 10.2982/PPS.12.1.12
Introduction: Longidoridae is a family of plant-parasitic nematodes belonging to the order Dorylaimida, that cause damage to most agricultural crops especially fruit trees by direct damage and also transmitting some plant pathogenic viruses. Considering the lack of prior research studies on this topic in the fruit orchards of Rafsanjan region, identifying and monitoring their population is important. Materials and Methods: In a study that was conducted to identify plant-parasitic nematodes of horticultural products in Rafsanjan city, some soil samples were collected from the rhizosphere of various fruit trees, in 2020. The nematodes were extracted from the soil samples using two methods, centrifugal flotation-sieving and tray technique, fixed and transferred to the anhydrous glycerin. After preparing permanent slides, the nematodes were studied using a light microscopy. The nematode species were identified based upon morphological and morphometric data using relevant valid references. Results: In this study, three species of Dorylaimida order belonging to the Longidoridae family including the two genera: Longidorus (L. africanus) and Xiphinema (X. vuittenezi and X. index) were obtained from the rhizosphere. Also, in order to confirm the traditional identification of X. vuittenezi, this species was molecularly studied using D2-D3 extension fragment of LSU rDNA. The obtained sequence of the species was 100% identical to the sequences of the other populations of X. vuittenezi in the GenBank. Conclusion: This study shows that regional nematode population monitoring needs more attention.


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