Effect of nutrients and plant extracts on Alternaria blight of tomato caused by Alternaria Alternata

2021 ◽  
Author(s):  
Ratan Lal Sharma ◽  
R. R. Ahir ◽  
Shankar Lal Yadav ◽  
Pinki Sharma ◽  
R. P. Ghasolia
Keyword(s):  
Plant Extracts ◽  
Alternaria Alternata ◽  
Alternaria Blight

Association between Alternaria macrospora and Alternaria alternata, causal agents of cotton leaf blight

1991 ◽  
Vol 69 (12) ◽  
pp. 2603-2607 ◽  
Author(s):  
Yoav Bashan ◽  
Hanna Levanony ◽  
Reuven Or
Keyword(s):  
Gossypium Hirsutum ◽  
Alternaria Alternata ◽  
Leaf Surface ◽  
Gossypium Barbadense ◽  
Cotton Leaf ◽  
Optimal Dosage ◽  
Alternaria Blight ◽  
Cotton Species ◽  
Infested Field ◽  
Blight Disease

The association between Alternaria macrospora and Alternaria alternata, responsible for the development of alternaria blight disease in cotton, was evaluated in artificially inoculated greenhouse plants and in naturally infested field plants. When greenhouse plants were inoculated with suboptimal doses of both pathogens (< 1.2 × 104 spores/mL) infection was greater than when separately inoculated by each pathogen at optimal dosage. In field-grown, naturally infected plants (Gossypium barbadense), both pathogens were found together in more than 40% of the plants. A second field-grown cotton species (Gossypium hirsutum) exhibited infection mainly by either A. alternata or both pathogens together. When both cotton species were naturally infected by both pathogens together, the number of A. alternata spores (either airborne or on the leaf surface) was greater than that of A. macrospora. We propose that A. macrospora together with A. alternata create a disease composite responsible for alternaria blight symptoms in cotton. Key words: Alternaria, cotton diseases, Gossypium barbadense, Gossypium hirsutum.

Antifungal properties of some selected plant extracts against leaf blight (Alternaria alternata)in tomato

2016 ◽  
Vol 17 (1) ◽  
pp. 151 ◽  
Author(s):  
Harikamal Barman ◽  
Aniruddha Roy ◽  
Shaon Kumar Das ◽  
N. U. Singh ◽  
D. K. Dangi ◽  
...  
Keyword(s):  
Plant Extracts ◽  
Alternaria Alternata ◽  
Leaf Blight ◽  
Antifungal Properties

scholarly journals Antifungal Effect of Different Plant Extracts against Phytopathogenic Fungi Alternaria alternata and Fusarium oxysporum Isolated from Tomato Plant

2021 ◽  
pp. 188-197
Author(s):  
Haytham M. Daradka ◽  
Abdelrahman Saleem ◽  
Wael Abdulghani Obaid
Keyword(s):  
Fusarium Oxysporum ◽  
Plant Extracts ◽  
Alternaria Alternata ◽  
Inhibition Zone ◽  
Inhibitory Effect ◽  
Phytopathogenic Fungi ◽  
Biologically Active ◽  
Diffusion Method ◽  
Minimum Fungicidal Concentration ◽  
Fungal Phytopathogens

The antifungal activity of 10 plant extracts was tested against the phytopathogenic fungi, Alternaria alternata and Fusarium oxysporum, the pathogens of early blight and wilt diseases of tomato. Plants tested related to different families. Three doses (10, 50 and 100 mg/ml) of plant extracts were assayed on A. alternata and F. oxysporum by measuring the inhibition zone of mycelial growth of fungi by disc-diffusion method on the Potato dextrose agar (PDA). The minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) of plant extracts were determined. The inhibitory effect of plant extracts ranged from 10-29 and 12-31 mm against A. alternata and F. oxysporum, respectively. The extracts of Pulicaria crispa and Olea chrysophylla were the most effective antifungal followed by Citrullus colocynthis, Psiadia arabica and Otostegia fruticosa. These plant extracts contain biologically active major compounds such as alkaloids, flavonoids, saponins, tannins and terpenoids. The remaining plant extracts did not emerge any inhibitive effect on tested fungi. The MIC and MFC of plant extracts ranged 6–38, 7-34 and 28-56, 22-50 mg/ml for A. alternata and F. oxysporum, respectively. Therefore, these plant extracts have biologically active compounds and have a potential to control fungal phytopathogens in agricultural crops.

scholarly journals Allelopathic effect of leaf extracts of Punica granatum and Spiraea prunifolia against post-harvest rot of tomato and brinjal

2020 ◽  
Vol 10 (2-s) ◽  
pp. 1-6
Author(s):  
Jahangir Abdullah Koka ◽  
Mohd Yaqub Bhat ◽  
Abdul Hamid Wani
Keyword(s):  
Antifungal Activity ◽  
Rhizoctonia Solani ◽  
Plant Extracts ◽  
Alternaria Alternata ◽  
Ethanolic Extract ◽  
Punica Granatum ◽  
Inhibitory Effect ◽  
Penicillium Expansum ◽  
Antimycotic Activity ◽  
Punica Granatum L

Antimycotic activities of different solvent extracts of Punica granatum L. and Spiraea prunifolia Siebold and Zucc. were carried out through agar well diffusion assay at three concentrations (25µl, 50µl and 75µl) against seven fungi causing rot diseases of tomato and brinjal. All the concentration of plant extracts showed antifungal activity against tested pathogenic fungi. Antimycotic activity increased with the increased concentrations of plant extracts. However, higher concentrations proved more effective than lower concentrations. It was revealed from the present study that the ethanolic extract of Punica granatum L. showed maximum antifungal activity against Rhizoctonia solani and Penicillium expansum and least inhibitory activity against Aspergillus niger. However, the aqueous extract of Punica granatum L. showed maximum antimycotic activity against Rhizoctonia solani and Alternaria alternata and least inhibitory effect against Penicillium expansum. It was further observed from the present study that the ethanolic extract of Spiraea prunifolia Siebold and Zucc. showed maximum antimycotic activity against Rhizoctonia solani and least inhibitory effect against Alternaria alternata. Whereas the aqueous extract of Spiraea prunifolia Siebold and Zucc showed maximum antifungal activity against Aspergillus niger and least inhibitory activity against Alternaria alternata. Keywords: Plant extracts, Concentration, Antimycotic effectiveness, tomato and brinjal, fungal rot pathogens, Inhibition zone.

scholarly journals Plant extracts and essential oils on the control of Alternaria alternata , Alternaria dauci and on the germination and emergence of carrot seeds ( Daucus carota L.)

2016 ◽  
Vol 46 (5) ◽  
pp. 764-770 ◽  
Author(s):  
Cristina Batista de Lima ◽  
Luana Lopes Assumpção Rentschler ◽  
João Tavares Bueno ◽  
Ana Cláudia Boaventura
Keyword(s):  
Essential Oil ◽  
Essential Oils ◽  
Plant Extracts ◽  
Alternaria Alternata ◽  
Orange Peel ◽  
Daucus Carota L ◽  
Randomized Design ◽  
Alternaria Dauci ◽  
Completely Randomized Design ◽  
Seeds Germination

ABSTRACT: The present study aims to investigate garlic, pepper and coriander plant extract as well as neem and orange peel essential oil effective ness to control Alternaria alternata and Alternaria dauci and their efficiency during carrot seeds germination and emergence. A completely randomized design was used in three different experiments. The first experiment evaluated the effect of plant extracts and essential oils on the incidence of A. alternata and A. dauci . It was done by means of a factorial design applied to five treatments (garlic, pepper, coriander, and neem and orange peel essential oils) at three concentrations (10, 20 and 30%).They also evaluated the controls untreated and with fungicide (Thiram).The second experiment evaluated the effect of the treatment at30% concentration on the germination and emergence of seedlings assessed on trays, and in the third experiment, the presence of A. alternata and A. dauci on the pericarp, endosperm and on the embryo. A. alternata showed higher incidence than A. dauci. The garlic extract and the orange essential oil showed the potential to control A. dauci and A. alternata, because their lower concentrations were able to sufficiently reduce the incidence of these fungi and because they do not affect carrot seeds germination and emergence. A. alternata conidia were found on the embryo (8%), pericarp (17%) and endosperm (31%).

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