_____________________________________________________________________________________________________ *Corresponding author: E-mail: karinecaiafa@yahoo.com.br; Journal of Experimental Agriculture International 41(4): 1-12, 2019; Article no.JEAI.51391 ISSN: 2457-0591 (Past name: American Journal of Experimental Agriculture, Past ISSN: 2231-0606) Effect of Different Varieties and Silicon Fertilizer on the Rooting Efficiency and Productivity of Mini- Cuttings and Powdery Mildew Disease of Eucalypt Karine Fernandes Caiafa 1* , Haroldo Nogueira de Paiva 1 and Laiz de Oliveira Sartori 1 1 Federal University of Viçosa, Brazil. Authors’ contributions This work was carried out in collaboration among all authors. Author KFC did the work, did the statistical analysis and wrote the first version of the manuscript. Author HNP designed the study acting as advisor. Author LOS who corrected the bibliographic references, included some considerations in the work and translated it into English. All authors read and approved the final manuscript. Article Information DOI: 10.9734/JEAI/2019/v41i430407 Editor(s): (1) Dr. Mohammad Reza Naroui Rad, Department of Horticulture Crops Research, Sistan Agricultural and Natural Resources Research and Education Center, Iran. (2) Dr. Biljana Bojovic, Assistant Professor, Faculty of Science, Institute of Biology and Ecology, University of Kragujevac, Republic of Serbia. (3) Dr. Daniele De Wrachien, Professor, State University of Milan, Italy. Reviewers: (1) Douira Allal, Ibn Tofail University, Morocco. (2) Pilli Rajeswari, University of Delhi, India. (3) Seint San Aye, Yezin Agricultural University, Myanmar. Complete Peer review History: https://sdiarticle4.com/reviewhistory/51391 Received 08 August 2019 Accepted 23 October 2019 Published 13 November 2019 ABSTRACT Considering that silicon (Si) is a nutrient that stands out in the control of fungal diseases and in the increase in productivity of several cultures, this study intend to evaluate its influence on the productivity and severity of mildew in ministumps, as well as rooting of eucalyptus minicuttings. The experiment was carried out in a randomized block design with four replications in split plot scheme, the first factor related to Silicon doses (0, 0.5, 1.0, 1.5 and 2 mmol L 1 ) and the second factor related to five clones of Eucalyptus grandis x Eucalyptus urophylla hybrids (I144, I224, 3334, GG100, GG680). The following variables were evaluated: Si content in minicuttings, powdery mildew severity and ministumps productivity, and rooting of minicuttings. The highest absorption Original Research Article