I'd like to log some custom errors to a separate log file, which I've got working but i'm also getting all the Umbraco messages in there as well. I'm sure its only a config issue can anyone help?

<log4net>

  <root>
    <priority value="Info"/>
    <appender-ref ref="AsynchronousLog4NetAppender" />
  </root>

  <appender name="AsynchronousLog4NetAppender" type="Umbraco.Core.Logging.AsynchronousRollingFileAppender, Umbraco.Core">
    <file value="App_Data\Logs\UmbracoTraceLog.txt" />
    <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
    <appendToFile value="true" />
    <rollingStyle value="Date" />
    <maximumFileSize value="5MB" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
    </layout>
    <encoding value="utf-8" />
  </appender>

  <appender name="SagepayLog4NetAppender" type="log4net.Appender.FileAppender">
    <file value="App_Data\Logs\SagepayLog.txt" />
    <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
    <appendToFile value="true" />
    <rollingStyle value="Date" />
    <maximumFileSize value="5MB" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
    </layout>
    <encoding value="utf-8" />
  </appender>

  <!--Here you can change the way logging works for certain namespaces  -->

  <logger name="NHibernate">
    <level value="WARN" />
  </logger>

  <logger name="Sagepay">
    <level value="ALL" />
    <appender-ref ref="SagepayLog4NetAppender" />
  </logger>

</log4net>

This is the code I'm using to log the error:

private static readonly ILog Logger = LogManager.GetLogger("Sagepay");

Logger.Info("Error message here");