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&lt;!--[if gte mso 9]&gt;&lt;xml&gt; &lt;w:WordDocument&gt; &lt;w:View&gt;Normal&lt;/w:View&gt; &lt;w:Zoom&gt;0&lt;/w:Zoom&gt; &lt;w:PunctuationKerning /&gt; &lt;w:ValidateAgainstSchemas /&gt; &lt;w:SaveIfXMLInvalid&gt;false&lt;/w:SaveIfXMLInvalid&gt; &lt;w:IgnoreMixedContent&gt;false&lt;/w:IgnoreMixedContent&gt; &lt;w:AlwaysShowPlaceholderText&gt;false&lt;/w:AlwaysShowPlaceholderText&gt; &lt;w:Compatibility&gt; &lt;w:BreakWrappedTables /&gt; &lt;w:SnapToGridInCell /&gt; &lt;w:WrapTextWithPunct /&gt; &lt;w:UseAsianBreakRules /&gt; &lt;w:DontGrowAutofit /&gt; &lt;/w:Compatibility&gt; &lt;w:BrowserLevel&gt;MicrosoftInternetExplorer4&lt;/w:BrowserLevel&gt; &lt;/w:WordDocument&gt; &lt;/xml&gt;&lt;![endif]--&gt;&lt;!--[if gte mso 9]&gt;&lt;xml&gt; &lt;w:LatentStyles DefLockedState="false" LatentStyleCount="156"&gt; &lt;/w:LatentStyles&gt; &lt;/xml&gt;&lt;![endif]--&gt;&lt;!--[if gte mso 10]&gt; &lt;mce:style&gt;&lt;! /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} --&gt; &lt;!--[endif] --&gt;&lt;p&gt;Avaliou-se a efetividade do silicato de potássio (K&lt;sub&gt;2&lt;/sub&gt;SiO&lt;sub&gt;3&lt;/sub&gt;) no controle de oídio em mudas de &lt;em&gt;Eucalyptus benthamii&lt;/em&gt;. Quatro tratamentos foram testados: pulverização de K&lt;sub&gt;2&lt;/sub&gt;SiO&lt;sub&gt;3&lt;/sub&gt; (4 mL L-&lt;sup&gt;1&lt;/sup&gt;) por 7 dias, pulverização de K&lt;sub&gt;2&lt;/sub&gt;SiO&lt;sub&gt;3&lt;/sub&gt; (4 mL L&lt;sup&gt;-1&lt;/sup&gt;) por 14 dias, pulverização do fungicida epoxiconazole + piraclostrobina (6 mL L-&lt;sup&gt;1&lt;/sup&gt;) por 14 dias e pulverização de água ultrapurificada por 7 dias. Dez mudas com 90 dias de idade foram utilizadas por parcela em três blocos ao acaso. A inoculação foi feita pincelando-se esporos de &lt;em&gt;Oidium eucalypti&lt;/em&gt;, retirados de mudas de &lt;em&gt;E. benthamii&lt;/em&gt; já infectadas, sobre aspartes superiores de mudas sadias. Aos 150 dias, avaliou-se a severidade da doença e determinou-se a massa fresca (MF) e a massa seca (MS) da parte aérea. Mediu-se o diâmetro do coleto (DC) e altura (H) das mudas aos 120 e 150 dias. Não houve diferenças significativas no incremento em altura das mudas, na relação H/DC e MS. A pulverização de silicato de potássio aos 14 dias apresentou os melhores resultados no incremento do colo, no controle da doença e na diferença entre MS e MF (p &amp;lt; 0,05). O uso de silicato de potássio em intervalos de 14 dias pode ser uma forma de controle do oídio, favorecendo o crescimento da muda de &lt;em&gt;E. benthamii&lt;/em&gt;.&lt;/p&gt;&lt;p&gt; &lt;/p&gt;&lt;p&gt;doi: 10.4336/2012.pfb.32.69.93&lt;/p&gt;<br>&lt;p&gt;The effectiveness of potassium silicate (K2SiO3) to control powdery mildew was evaluated in &lt;em&gt;Eucalyptus benthamii &lt;/em&gt;seedlings. Four treatments were applied: sprays of K2SiO3 (4 mL L-1) for 7 days, K2SiO3 (4 mL L-1) for 14 days, fungicide epoxiconazole + pyraclostrobin (6 mL L-1) for 14 days and ultrapurified water for 7 days. The experiment consisted of a randomized complete block design with three replicates, each with 10 seedlings with 90 days old per plot. Inoculation was done by brushing spores of &lt;em&gt;Oidium eucalypti&lt;/em&gt;, collected from infected &lt;em&gt;E. benthamii &lt;/em&gt;seedlings, onto superior parts of healthy seedlings. It was measured the diameter of the root collar (DC) and height (H) of the seedlings at 120 and 150 days. After 150 days, severity of disease, fresh mass (MF) and dry mass (MS) of aerial part were determined. No statistically significant differences were observed in height increment of the seedlings, in H/DC and MS. Sprays of potassium silicate at 14-days intervals showed the best results in the increase of the DC, in disease control and the difference between MS and MF (p &amp;lt; 0.05). The use of potassium silicate at 14-days intervals can be a form of control of powdery mildew, favoring the seedling growth of &lt;em&gt;E. benthamii.&lt;/em&gt;&lt;/p&gt;&lt;p&gt; &lt;/p&gt;&lt;p&gt;doi: 10.4336/2012.pfb.32.69.93&lt;em&gt;&lt;br /&gt;&lt;/em&gt;&lt;/p&gt;