Resumen

ALBORNOZ B., Cesar; SILVA P., Amanda  y  TORRES M., Francisco. Fertigation with silicon in rose varieties on severity of powdery mildew(Sphaerotheca pannosa var. rosae). Rev. Cienc. Agr. [online]. 2016, vol.33, n.2, pp.84-94. ISSN 0120-0135.  https://doi.org/10.22267/rcia.163302.55.

The research evaluated the Fertigation with silicon in the severity of the powdery mildeo (Sphaerotheca pannosa var. Rosae) in three varieties of rose under greenhouse. The experiment was a split-split plot design with silicon doses (SiO₂)(DS) as the main-plot factor: (DS₁=3mgL^-1), (DS₂=6mgL^-1) and (DS₃=9mgL^-1); Fertigation (L) as the sub-plot factor: (L₁=3 mmdía^-1), (L₂=5 mmdía^-1) and rose varieties (V) as the sub-sub-plot factor: (V₁ = Vendela), (V₂ = Reed Unique) and (V₃ = Miracle). There were differences (p=0.01) due to the effect of SD (silicon dose), L (fertigation) and V (varieties); As well as the DS * L interaction (p=0.01). DS₃ applications reduced fungus severity (20%) while DS₁ was less efficient (230%). Lower percentages of fungal severity were obtained with Fertigation L₁ (130%) and while L₂ had the higher (280%). Varieties V₂ and V₃ were less affected by fungus (170 and 160%) while V₁ was more susceptible to it (320%). The DS₃ dose and the L₁ fertigation interaction reduced fungal severity (75%) (p=0.05). The behavior of the Miracle and Reed Unique rose varieties with a 3mm.day^-1 fertigation and a silicon dose of 9mgL^-1 could be key to decreasing the severity of Sphaerotheca pannosa var. Rosae in flower growing areas of Colombia.

Palabras clave : Fungus; greenhouse; nutrition; relative humidity; temperature..

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