Susceptibility of some Rose Varieties to Verticillium Wilt and Role of Beat Moss and Compost on its Control

Document Type : Original Article

Author

Plant Pathol. Dept., Fac. Agric., Minia Univ., Egypt

Abstract

Six rose species or varieties, i.e. Rosa gallica var Aegyptiaca, Rosa hybrid var. Hamoschush, Rosa hybrid var. Queen, Rosa hybrid var. Yellow, Rosa hybrid var. White and Rosa canina were tested to study their relative susceptibility to infection by Verticillium dahliae, the causal pathogen of rose wilt. All tested varieties and species of rose are liable to infection with different degrees. Isolates VD1 and VD2 appeared to be the most pathogenic ones. Rosa canina was the highly resistant to Verticillium wilt. Rosa gallica var. Aegyptiaca, R. hybrid var. Yellow, R. hybrid var. White and R. hybrida var. Queen are the most susceptible, while Rosa hybrid var. Hamoschush was moderately susceptible to any of the tested isolates. Mixing the Nile loamy soil with different levels of peat moss led to remarkable decrease of both disease incidence (DI, %) and severity (DS, %). The percentages of reduction of DI and DS were increased with increasing the rate of peat moss amended to soil. The maximum infection with any of the tested isolates occurred in the raw loamy soil, 90 days after sowing, whereas the lowest infection resulted when soil was mixed with peat moss by 66.6% (1:2 ratio). Amending of either Bio-Pianta compost or rice straw compost to the soil before sowing significantly decreased the wilt of rose incidence by 44.4 – 88.9 and disease severity by 45.7 - 91.6% when compared with the control (compost free soil), in both seasons of the experiment. The Bio-Pianta compost caused higher reduction in both DI, % and DS, % of rose wilt if compared with rice straw.

Keywords

Egyptian Journal of Phytopathology
Volume 44, Issue 2
December 2016
Pages 155-166

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