Microbicidal effects of magnetic field and irradiation on plant pathogenic Thielaviopsis paradoxa and Pectobacterium cartovorum

Document Type : Original Article

Authors

1 Department of Botany (microbiology), Faculty of Agriculture, South Valley University, 83523 Qena, Egypt

2 Department of Botany (plant pathology), Faculty of Agriculture, South Valley University, 83523 Qena, Egypt

Abstract

Microbicidal influence of abiotic control like as Ultraviolet irradiation (UV) and Magnetic field (MF) on the growth survival rate of phytopathogenic fungus Thielaviopsis paradoxa (Th. Paradoxa) causes date palm black rot or stem-end-rot disease and plant pathogenic bacteria Pectobacterium cartovorum (Pe. cartovorum) cause of soft onion rot. The peak UV wavelength of 100-280 nm was used for (0, 5,10, 15, 20, 25, and 30 minutes). The effect of UV wavelength was used on the above fungi and bacteria on solid nutrient agar (NA) medium and measured the growth number colony forming unit (CFU)/ml ) on the Petri dish. The MF Single field strength of 10 gausses was used on a liquid nutrient broth (NB) medium and measured the growth by the optical density (O.D) and CFU for 30 minutes at 28 °C. The results of reduction show best effect for MF at 5 cm was 99%, with a growth rate of 1.1 x 102 compared with Pe. cartovourum. The O.D results of Pe. cartovorum at UV ray was 0.09 and colony forming unit 1.5 × 107 CFU/ml). At the end of the exposure time of optical density, the O.D and CFU were 1.2 and 1.11 CFU/ml. That mechanism significantly differs from the account number of colony growth in a Petri dish when the field uses a direct magnetic area that incurrence the colony of fungi. The abiotic factors in this study affect the control of plant pathogens and are considered alternatives with an environmental and economic impact.

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SVU-International Journal of Agricultural Sciences
Volume 4, Issue 3
July 2022
Pages 104-112

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