Razieh Assadi; Mostafa Darvishnia; Mehdi Nasr Esfahani; Eidy Bazgir; Samira Pakbaz
Abstract
One of the most important pathogens in plants such as pomegranate, are root-knot nematodes (Meloidogyne spp.) which cause considerable damage to this important export product. Due to the importance of this subject, an study has been conducted between 2018 and 2019 in the Faculty of Agriculture of Lorestan ...
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One of the most important pathogens in plants such as pomegranate, are root-knot nematodes (Meloidogyne spp.) which cause considerable damage to this important export product. Due to the importance of this subject, an study has been conducted between 2018 and 2019 in the Faculty of Agriculture of Lorestan University. The treatments include organic fertilizer (40, 60, and 80 t/ha.), vermicompost (40 t/ha.) and Marygld product (200, 300 and 400 g/m2) with the study, itself, being in a completely random design on the dominant root-knot nematodes species, M. javanica under greenhouse conditions on pomegranate seedlings. The measurement indicators include gall index, the number of egg sacs, and the final population of egg and J2 larvae in the soil and the roots, as well as growth factors of pomegranate seedlings. Reproduction factor and the percentage of increase/decrease of root knot nematode population, have been calculated in each treatment compared to the initial population of the same treatment. Results show vermicompost (40 t/ha.) with 94.35% reduction in population of egg and larvae has had the highest effect on reducing the nematode population compared to other treatments. Marygld 400, 300, and 200 g/m2 treatments are ranked next, with a reduction of 93.47%, 91.21%, and 92.65% in nematode population, respectively followed by by nematode reduction of the composts of 80, 60, and 40 t/ha by 89.67%, 86.55%, and 86.81% respectively.
Mostafa Darvishnia; Moslem Moosavian
Abstract
The current study been conducted to achieveto effective antagonists for diseases control of seedling damping-off greenhouse pepper, casead by Rhizoctonia solani. Experiments has conducted based on completely randomized design in the faculty of agriculture and natural resources of Lorestan University ...
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The current study been conducted to achieveto effective antagonists for diseases control of seedling damping-off greenhouse pepper, casead by Rhizoctonia solani. Experiments has conducted based on completely randomized design in the faculty of agriculture and natural resources of Lorestan University in 2016-17. First, the fungi and biological agents were isolated and identified of the rhizosphere of Solanaceae plants. The antagonistic ability of fungal and bacterial isolates, such as Trichoderma harzianum and Trichoderma virens fungi and Bacillus subtilis bacteria, against R. solani was studied by using dual culture method. As well as antagonistic ability of fungal and bacterial agents and Trichomix HV biological fungicide were study in a greenhouse condition. The results showed that both species of T. harzianum and T. virens the prevented growth of fungi 9.45 and 15.59 percent respectively by colonization and sporulation in PDA. Antagonistic bacterial also caused effects such as outpour of the contents of hyphae, color change at the tip of hyphae, thinning and reduction of mycelium up to 8.47 percent. Also, results in greenhouse condition showed that B. subtilis and T. harzianum treatments have the most positive effects on growth traits such as height and weight (wet and dry) of the root and stem and reduced the severity of the disease up to 60.33 and 70.33 respectively; therefore they are the best antagonistic agents to control R. solani on pepper.
Mostafa Darvish nia; Abdolhosein Rezaei Nejad; Bahram Delfan
Abstract
To investigate the antifungal effects of essential oils of Khuzestani savory (Satureja khuzistanica Jamzad), Rechingeri savory (S. rechingeri Jamzad), carvacrol and Benomyl on Botrytis cinerea, this study was carried out in a PDA medium, and on grapes, kiwi fruits and strawberry. The experiment was laid ...
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To investigate the antifungal effects of essential oils of Khuzestani savory (Satureja khuzistanica Jamzad), Rechingeri savory (S. rechingeri Jamzad), carvacrol and Benomyl on Botrytis cinerea, this study was carried out in a PDA medium, and on grapes, kiwi fruits and strawberry. The experiment was laid out factorially based on a completely randomized design with three replications. The results showed that essential oil of Khuzestani savory, Carvacrol and Benomyl had greater antifungal effects compared with that in essential oil of Rechingeri savory. The main components of essential oil of Khuzestani savory were Carvacrol (91.16 Percent), p-Cymene (1.26 Percent), γ-Terpenen (0.74 Percent). The main components of essential oil of Rechingeri savory were Carvacrol (77.2 Percent), p-Cymene (1.26 Percent), γ-Terpenen (1.62 Percent). Essential oil of Khuzestani savory with concentrations of 200 ml, Carvacrol and Benomyl in all concentrations used showed 100 percent fungal inhibitory effects. The results of experiments in medium and on fruits showed that the antifungal effects of essential oils increased as their concentration increased.