Tries from fly-half Jason Tovey and replacement Sarel Pretorius were not enough to prevent another disappointing defeat for the Dragons and Landman is expecting better.
"It's down to individual responsibility, like we say every week, and all we can do is work hard. It's Ulster next and it's not going to get any easier," he told the South Wales Argus.
"It's the small stuff that we work on in training and every time it is the same thing. If improvements don't happen then the coaches will have to get players in who can do the job because we are not just letting ourselves down but the fans.
"We were inaccurate in the set piece and if you go in with a kicking mindset then the lineout has to go with it to put pressure on the opposition, then you turn pressure into points.
"Let's just focus on Ulster - we haven't given away a try so far this season at home and the scrum went well so we have to sharpen up the lineout.
"If you want to be a contender - look at the All Blacks, Australia, Argentina, South Africa - they do the set piece well."
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