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Plant Pathology Journal
  Year: 2018 | Volume: 17 | Issue: 2 | Page No.: 65-74
DOI: 10.3923/ppj.2018.65.74
Role of Arbuscular Mycorrhizae Fungi and Humic Acid in Controlling Root and Crown Rot of Strawberry
Eman Yehia Khafagi, Sozan Eid El-Abeid, Maali Shaker Soliman, Shereen El-Sayed Mohamed El-Nahas and Yosra Ahmed

Abstract:
Background and Objective: Strawberry plants are threatened by root and crown rot diseases during nursery stage and under field conditions leading to substantial losses in production. This investigation aimed to control root and crown rot of strawberry plants in nursery and field using Arbuscular Mycorrhizal Fungi (AMF) and humic acid as alternative means to fungicides. The experiments were carried out for two seasons in naturally infested nursery and field in Al-Qalyubia governorate, Egypt. Methodology: Humic acid and Arbuscular Mycorrhizal Fungi (AMF) (a mixture of Claroideoglomus etunicatum, Rhizophagus diaphanous and R. intraradices), singly and in combination were used to control root and crown rot in nursery and field. The effect of treatments on disease severity and different growth parameters was investigated in addition to the effect of treatments on sugar content, phenols and firmness of the fruits. Occupation of roots by AMF was also examined in the different treatments. Results: The AMF and humic acid significantly reduced the disease severity in both nursery and field. The combined treatment of AMF and humic acid in the nursery did not improve their efficiency in reducing disease severity compared to the single treatments with either one, while in the field the combined treatment of AMF and humic acid improved their efficiency in reducing disease severity compared to single treatments. However, results revealed that the root occupation with AMF was reduced by adding humic acid to treatments. The dual effect of humic acid and AMF was clear in increasing both early, total yield and healthy seedlings production in the nursery. The AMF was the most effective treatment in increasing sugar content of the fruits. Data also revealed the lack of correlation between disease severity and each of total and free phenols. Conclusion: The AMF and humic acid can be recommended for controlling root and crown rot of strawberry plants in nursery and field. The use of these two treatments in disease control during nursery stage led to the production of healthy and vigorous seedlings to be used commercially in the fields.
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How to cite this article:

Eman Yehia Khafagi, Sozan Eid El-Abeid, Maali Shaker Soliman, Shereen El-Sayed Mohamed El-Nahas and Yosra Ahmed, 2018. Role of Arbuscular Mycorrhizae Fungi and Humic Acid in Controlling Root and Crown Rot of Strawberry. Plant Pathology Journal, 17: 65-74.

DOI: 10.3923/ppj.2018.65.74

URL: https://scialert.net/abstract/?doi=ppj.2018.65.74

 
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