Evaluation of Native Bacterial Isolates for Control of Cucumber Powdery Mildew under Greenhouse Conditions

Evaluation of Native Bacterial Isolates for Control of Cucumber Powdery Mildew under Greenhouse Conditions

Cucumber plants are often attacked by various pathogens, which can considerably decrease production and cause significant losses. One of the most prevalent fungal diseases is powdery mildew, caused by an obligate pathogen, Podosphaera xanthii. It is a serious disease that causes significant damage t...

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Bibliographic Details
Published in:Horticulturae Vol. 8; no. 12; p. 1143
Main Authors: Abo-Elyousr, Kamal Ahmed M., Seleim, Mohamed Al-Sadek Abd Al-Haleim, Almasoudi, Najeeb Marei, Bagy, Hadeel Magdy Mohammed Khalil
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-12-2022
Subjects:
Airborne microorganisms
Bacillus (Bacteria)
Bacillus aerius
Bacillus licheniformis
Biological control
Cell culture
Control
cucumber
Cucumbers
Diseases and pests
Dry weight
Environmental aspects
Filtrate
Fungal diseases
Fungicides
Germination
Greenhouses
Health care
Health services
Infections
Inoculation
Leaves
Microorganisms
Mildew
Pathogens
Performance evaluation
Peroxidase
Pesticides
Pests
Phenols
phenols contents
Physiological aspects
Plant diseases
Podosphaera xanthii
Polyphenol oxidase
Powdery mildew
Spraying
Sprays
Vegetables
Egypt
Saudi Arabia
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Summary:Cucumber plants are often attacked by various pathogens, which can considerably decrease production and cause significant losses. One of the most prevalent fungal diseases is powdery mildew, caused by an obligate pathogen, Podosphaera xanthii. It is a serious disease that causes significant damage to the whole plant, i.e., leaves, fruits, and stems, under both greenhouse and field conditions. The main objective of this result is to assess the effectiveness of Bacillus spp. against cucumber powdery mildew under in vitro and in vivo conditions. Treatment with B. licheniformis and B. aerius culture filtrates reduced the conidial germination of the pathogen by 60 and 85%, respectively. Under greenhouse conditions, spraying cucumber plants with both microorganisms was effective at reducing powdery mildew disease severity. High reductions of disease severity were achieved by treatment of B. licheniformis as a cell suspension and B. aerius strain as culture filtrate, 45.3 and 77.3%, respectively, two days before inoculation. Additionally, treatment with these bacterial strains resulted in a significant increase in the fresh and dry weights of the cucumber plants. The highest increase of fresh and dry weight was found with B. licheniformis CS and B. aerius strain CF treatment at two days before or after infection. After treatment with the bioagents, the content of total phenols, polyphenol oxidase, and peroxidase was enhanced in treatment plants. The use of B. licheniformis and B. aerius as foliar sprays significantly induced resistance to P. xanthii in cucumber plants and stimulated many biochemical functions. Therefore, we propose B. licheniformis and B. aerius as an effective alternative to harmful chemicals.
ISSN:2311-7524
2311-7524
DOI:10.3390/horticulturae8121143