scholarly journals In vitro antifungal activities of 26 plant extracts on mycelial growth of Phytophthora infestans (Mont.) de Bary

2011 ◽  
Vol 10 (14) ◽  
pp. 2625-2629 ◽  
Author(s):  
Yanar Yusuf ◽  
Kadioğlu Izzet ◽  
Gouml kccedil e Ayhan ◽  
Demirtaş İbrahim ◽  
Gouml ren Nezhun ◽  
...  
Keyword(s):  
Phytophthora Infestans ◽  
Plant Extracts ◽  
Mycelial Growth ◽  
Antifungal Activities

scholarly journals Evaluation of various plant extracts against the early blight disease of tomato plants under greenhouse and field conditions

2012 ◽  
Vol 48 (No. 2) ◽  
pp. 74-79 ◽  
Author(s):  
S.M.A. Nashwa ◽  
K.A.M. Abo-Elyousr
Keyword(s):  
Disease Severity ◽  
Plant Extracts ◽  
Mycelial Growth ◽  
Early Blight ◽  
Field Conditions ◽  
Nerium Oleander ◽  
Tomato Plants ◽  
Infected Control ◽  
Blight Disease

The antimicrobial activity of six plant extracts from Ocimum basilicum (Sweat Basil), Azadirachta indica (Neem), Eucalyptus chamadulonsis (Eucalyptus), Datura stramonium (Jimsonweed), Nerium oleander (Oleander), and Allium sativum (Garlic) was tested for controlling Alternaria solani in vitro and in vivo. In in vitro study the leaf extracts of D. stramonium, A. indica, and A. sativum at 5% concentration caused the highest reduction of mycelial growth of A. solani (44.4, 43.3 and 42.2%, respectively), while O. basilicum at 1% and 5% concentration and N. oleander at 5% concentration caused the lowest inhibition of mycelial growth of the pathogen. In greenhouse experiments the highest reduction of disease severity was achieved by the extracts of A. sativum at 5% concentration and D. stramonium at 1% and 5% concentration. The greatest reduction of disease severity was achieved by A. sativum at 5% concentration and the smallest reduction was obtained when tomato plants were treated with O. basilicum at 1% and 5% concentration (46.1 and 45.2 %, respectively). D. stramonium and A. sativum at 5% concentration increased the fruit yield by 76.2% and 66.7% compared to the infected control. All treatments with plant extracts significantly reduced the early blight disease as well as increased the yield of tomato compared to the infected control under field conditions.

scholarly journals Antifungal Activities of Selected Plant Extracts in In-Vitro Control of Anthracnose and Root Rot Diseases on Cucumber (Cucumis sativus B.)

2021 ◽  
Vol 8 (2) ◽  
pp. 80-86
Author(s):  
Wuraola Funmi Ogundipe ◽  
Ayotunde Ajoke Pitan ◽  
Oluwafemi Michael Adedire ◽  
Adekunle Opeyemi Farinu ◽  
Barry Oyeyemi Oyewole
Keyword(s):  
Cucumis Sativus ◽  
Plant Extracts ◽  
Root Rot ◽  
Antifungal Activities

scholarly journals In vitro antifungal potential of plant extracts against Fusarium oxysporum, Rhizoctonia solani and Macrophomina phaseolina.

2017 ◽  
Vol 6 (9) ◽  
pp. 1676 ◽  
Author(s):  
Ramaraju Cherkupally ◽  
Srinivasa Reddy Kota ◽  
Hindumathi Amballa ◽  
Bhumi Narasimha Reddy
Keyword(s):  
Rhizoctonia Solani ◽  
Fusarium Oxysporum ◽  
Plant Extracts ◽  
Mycelial Growth ◽  
Aloe Vera ◽  
Datura Stramonium ◽  
Macrophomina Phaseolina ◽  
Calotropis Procera ◽  
Fungitoxic Effect

The antifungal activity of aqueous extracts of nine plants viz, Azadirachta indica, Parthenium hysterophorus, Momordica charantia, Allium sativum, Eucalyptus globules, Calotropis procera, Aloe vera, Beta vulgaris and Datura stramonium were assessed in vitro against Fusarium oxysporum f. sp. melongenae, Rhizoctonia solani and Macrophomina phaseolina, the soil borne phytopathogens. The assessment of fungitoxic effect was carried out by using three different concentrations i.e., 5, 10 and 20% against the test fungi, in terms of percentage of mycelial growth inhibition. The extract of A. sativum completely inhibited the mycelial growth of M. phaseolina at all the concentrations. The extracts of D. stramonium and E. globulus inhibited the mycelial growth of R. solani of 72%, and 70.7% respectively at 20% concentration, that of A. sativum, E. globulus and D. stramonium exhibited inhibition percentage of 63.3%, 61.8% and 61.1% respectively at 20% concentration on Fusarium oxysporum f. sp. melongenae. The application of plant extracts for disease management could be less expensive, easily available, non-polluting and eco-friendly.

Antifungal Activities (In vitro) of Some Plant Extracts and Smoke on Four Fungal Pathogens of Different Hosts

2002 ◽  
Vol 5 (3) ◽  
pp. 307-309 ◽  
Author(s):  
Shahidul Alam ◽  
Nargis Akhter ◽  
Most. Ferdousi Begum ◽  
M. Sabina Banu . ◽  
M. Rafiqul Islam . ◽  
...  
Keyword(s):  
Plant Extracts ◽  
Fungal Pathogens ◽  
Antifungal Activities

scholarly journals Variations in the Sensitivity of Phytophthora infestans Isolates from Different Genetic Backgrounds to Dimethomorph

Plant Disease ◽  
2003 ◽  
Vol 87 (11) ◽  
pp. 1283-1289 ◽  
Author(s):  
J. M. Stein ◽  
W. W. Kirk
Keyword(s):  
Life Cycle ◽  
Phytophthora Infestans ◽  
Mycelial Growth ◽  
Hyphal Growth ◽  
Potato Leaf ◽  
Leaf Discs ◽  
Highly Sensitive ◽  
Significant Difference ◽  
Cyst Germination

The sensitivities of 11 isolates of Phytophthora infestans to dimethomorph were examined at all stages of the asexual life cycle and when inoculated onto potato leaf discs. In vitro zoospore encystment and cyst germination were highly sensitive to dimethomorph with 50% reduction of mycelial growth and cyst germination (EC50) values for most isolates <0.20 μg/ml, whereas direct sporangia germination and in vitro hyphal growth and sporulation were less sensitive (means of 0.45 and 0.22 μg/ml, respectively). Zoosporogenesis was not significantly inhibited at the maximum dimethomorph concentration examined, 10 μg/ml. Significant differences (Fisher's least significant difference, P = 0.05) in the EC50 values were present between isolates for all stages of the asexual life cycle, except direct sporangia germination and zoosporogenesis. Sensitivity ratios between the least- and most-sensitive isolates were 6.11, 12.14, 12.36, and 10.56 for hyphal growth, in vitro sporulation, zoospore encystment, and cyst germination, respectively. Application of dimethomorph at 1,000 μg/ml to potato leaf discs at 24 or 48 h before inoculation completely inhibited symptom incidence for most isolates, whereas application after inoculation generally was not significantly different from the untreated control, regardless of concentration. Sporulation from leaf discs treated with dimethomorph at 24 or 48 h after inoculation was completely inhibited for all isolates with dimethomorph at 1,000 μg/ml, even when symptom incidence was not significantly reduced.

Synthesis and antifungal activities of 3-substituted phthalide derivatives

2019 ◽  
Vol 74 (11-12) ◽  
pp. 811-818 ◽  
Author(s):  
Lingling Fan ◽  
Bilan Luo ◽  
Zhongfu Luo ◽  
Li Zhang ◽  
Judi Fan ◽  
...  
Keyword(s):  
Growth Rate ◽  
Bioactive Compounds ◽  
Mycelial Growth ◽  
Phytopathogenic Fungi ◽  
Antifungal Activities ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
Mycelial Growth Rate ◽  
Rate Method

AbstractIn order to obtain novel bioactive compounds with significant antifungal activities, two series of 3-substituted phthalide derivatives were designed and synthesized via reduction, bromine substitution, and etherification. In addition, the antifungal activities of all target compounds against nine phytopathogenic fungi in vitro were tested by using the mycelial growth rate method at the concentration of 50 μg mL−1. Preliminary bioassay tests showed that some compounds exhibited more potent antifungal activities as compared with hymexazol. The preliminary structure-activity relationships (SARs) of all target compounds were also investigated.

scholarly journals Contribution of Hydrogen Cyanide to the Antagonistic Activity of Pseudomonas Strains Against Phytophthora infestans

2020 ◽  
Vol 8 (8) ◽  
pp. 1144
Author(s):  
Abhishek Anand ◽  
Delphine Chinchilla ◽  
Christopher Tan ◽  
Laurent Mène-Saffrané ◽  
Floriane L’Haridon ◽  
...  
Keyword(s):  
Growth Inhibition ◽  
Phytophthora Infestans ◽  
Hydrogen Cyanide ◽  
Mycelial Growth ◽  
Developmental Stages ◽  
Antagonistic Activity ◽  
Potato Leaf ◽  
Relative Contribution ◽  
Production Of Hydrogen

Plants face many biotic and abiotic challenges in nature; one of them is attack by disease-causing microbes. Phytophthora infestans, the causal agent of late blight is one of the most prominent pathogens of the potato responsible for multi-billion-dollar losses every year. We have previously reported that potato-associated Pseudomonas strains inhibited P. infestans at various developmental stages. A comparative genomics approach identified several factors putatively involved in this anti-oomycete activity, among which was the production of hydrogen cyanide (HCN). Here, we report the relative contribution of HCN emission to the overall anti-Phytophthora activity of two cyanogenic Pseudomonas strains, P. putida R32 and P. chlororaphis R47. To quantify this contribution, we generated HCN-negative mutants (Δhcn) and compared their activities to those of their respective wild types in different experiments assessing P. infestans mycelial growth, zoospore germination, and infection of potato leaf disks. Using in vitro experiments allowing only volatile-mediated interactions, we observed that HCN accounted for most of the mycelial growth inhibition (57% in R47 and 80% in R32). However, when allowing both volatile and diffusible compound-mediated interactions, HCN only accounted for 1% (R47) and 18% (R32) of mycelial growth inhibition. Likewise, both mutants inhibited zoospore germination in a similar way as their respective wild types. More importantly, leaf disk experiments showed that both wild-type and Δhcn strains of R47 and R32 were able to limit P. infestans infection to a similar extent. Our results suggest that while HCN is a major contributor to the in vitro volatile-mediated restriction of P. infestans mycelial growth, it does not play a major role in the inhibition of other disease-related features such as zoospore germination or infection of plant tissues.

scholarly journals A Review of Tropical Plants with Antifungal Activities against Plant Fungal Pathogens

2016 ◽  
Author(s):  
Dewa Ngurah Suprapta
Keyword(s):  
Plant Extract ◽  
Plant Extracts ◽  
Fungal Pathogens ◽  
Control Plant ◽  
Fungal Diseases ◽  
Tropical Plants ◽  
Antifungal Activities ◽  
In Vivo Tests

Abstract Plant fungal pathogens are frequently found as one of limiting factors for crop production. More than 10,000 species of fungi can cause disease in plants. To control the diseases, many farmers are still rely on the use of chemical fungicides, however most synthetic fungicides can cause acute toxicity, and some cause chronic toxicity as well. Thus, an appropriate technological improvement towards a more effective use of natural resources is required in agriculture to develop environmentally friendly sustainable farming system. This paper highlights the potential of extracts of tropical plants as antifungal agent to control plant fungal diseases. Information and data presented in this paper are mainly derived from selected and related references that previously published in the scientific journals. Many higher plants of tropical origin with fungicidal activities and their potential for fungal disease control of agricultural crops have been studied, however most of the studies have been done under in vitro condition. Some plant extracts showed strong antifungal activities on in vitro as well as in vivo tests, but some plant extracts showed significant antifungal activities on in vitro test, but did not obvious on in vivo tests. A great variation in antifungal activities were shown by plants extracts of different species and plant parts, in one hand, and on the other hand, variation was also observed on the responses of different fungal species to the same plant extract. Since the purpose of the use of plant extract is to control plant fungal diseases, the field trial is needed to ensure the stability of efficacy of certain plant extract. In addition, isolation and identification of active substances in the extracts is needed to assess possible mode of action and side effect of their use.

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