Role of certain bioagents against Guava decline disease and in enhancement of the growth of guava trees

Authors

  • F. M. Zaitoun Department of Plant Pathology, Faculty of Agriculture, Alexandria University, Alexandria,
  • Y. K. H. First: Faculty of Agriculture, Alexandria University, Egypt. Second: College of Food and Agriculture sciences, King Saud University, Saudi Arabia.
  • Mageda M. Fahmy Department of Plant Pathology, Faculty of Agriculture, Alexandria University, Alexandria,
  • Sabreen M. Ziyada Department of Plant Pathology, Faculty of Agriculture, Alexandria University, Alexandria,

Keywords:

bioagents, Guava, decline disease, volatile compounds, Trichoderma, Bacillus, Pseudomonas.

Abstract

Biocontrol agents, Bacillus subtilis, Pseudomonas fluorescens and Trichoderma harzianum were evaluated against fungi causing guava (Psidium guajava) decline disease caused by Botryodiplodia theobromae, Fusarium oxysporum, and Rhizoctonia solani. Generally, our results showed high antagonistic effects of tested biocontrol agents against previous pathogens. T. harzianum isolates showed an average of 58% inhibition against all pathogens. T. harzianum T4 was the most prominent isolate in inhibiting the growth of guava pathogenic fungi. Based on the secretion of volatile substances, T4 had the most significant inhibition ability as compared to other Trichoderma isolates. By using B. subtilis, the radial growth of R. solani and F. oxysporum was significantly decreased as compared to B. theobromae. In case of P. fluorescens, the radial growth of R. solani was decreased more than B. theobromae followed by F. oxysporum. Different densities of T4 significantly decreased the disease severity and increased plant height, dry weight of shoots and roots and total pigments (chlorophyll a and b, and carotenoids) in guava trees in comparison with infected trees only. We concluded that the application of biocontrol agents decreased guava decline disease and improved the growth of guava trees.

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Author Biographies

F. M. Zaitoun, Department of Plant Pathology, Faculty of Agriculture, Alexandria University, Alexandria,

Professor of Plant Pathology Department, Faculty of Agriculture, Alexandria University, Alexandria, Egypt.

Y. K. H., First: Faculty of Agriculture, Alexandria University, Egypt. Second: College of Food and Agriculture sciences, King Saud University, Saudi Arabia.

Department of Plant Protection, Fungal Diseases and Biological control

Mageda M. Fahmy, Department of Plant Pathology, Faculty of Agriculture, Alexandria University, Alexandria,

Lecturer of Plant Pathology Department, Faculty of Agriculture, Alexandria University, Alexandria, Egypt. Lecturer of Plant Pathology Department, Faculty of Agriculture, Alexandria University, Alexandria, Egypt.

Sabreen M. Ziyada, Department of Plant Pathology, Faculty of Agriculture, Alexandria University, Alexandria,

Assistant Lecturer of Plant Pathology Department, Faculty of Agriculture, Alexandria University, Alexandria, Egypt. Lecturer of Plant Pathology Department, Faculty of Agriculture, Alexandria University, Alexandria, Egypt.Lecturer of Plant Pathology Department, Faculty of Agriculture, Alexandria University, Alexandria, Egypt. Lecturer of Plant Pathology Department, Faculty of Agriculture, Alexandria University, Alexandria, Egypt.

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Published

2016-02-22

How to Cite

Zaitoun, F. M., H., Y. K., Fahmy, M. M., & Ziyada, S. M. (2016). Role of certain bioagents against Guava decline disease and in enhancement of the growth of guava trees. Journal of Phytopathology and Disease Management, 2(3), 43–54. Retrieved from https://ppmj.net/index.php/ppmj/article/view/48

Issue

Vol. (2), Issue (3)

Section

Research Articles

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