England conceded the series with a 51-run defeat in Brisbane, to leave them 4-1 down with two games to play. In each of their four defeats Strauss' side have been bowled out, with their latest reverse confirmed when they were dismissed for 198 after Chris Woakes' six for 45 had left them chasing an achievable 250.
"One of the improvements we have made in one-day cricket over the past 12 or 18 months was a lot of our batsmen getting bigger scores more consistently, but we've fallen into bad habits in this series," he said Strauss with the World Cup less than a month away.
"Twenties and thirties and soft dismissals, that's been plaguing us all the way through this series and ultimately that's what has lost us the series. Our decision-making has been not very good on these wickets. In one-day cricket you've got to decide when is the right time to attack, who is the right bowler to attack.
"We just haven't done that well enough. We haven't been smart enough as a batting unit. We can't hide away from it, we've got to take it on the chin, accept it and try and remedy it for these last two games and try and get some momentum heading into the World Cup."
Strauss denied that the batsmen's poor form was a result of mental fatigue at the end of a long tour of Australia, which has seen them jetting across the country since October.
"If you are mentally fatigued you probably do make poor decisions but I don't think you can just blame every poor decision on mental fatigue," he added. "There's no reason for us to be really fatigued at this stage.
"We've got a lot of cricket ahead of us. We look after ourselves well and if guys are starting to think about that then that's a dangerous place for us to be."
While England's batting problems may be attributed to mental lapses, the concern over their bowlers is physical after injuries to Ajmal Shahzad and Chris Tremlett. Shahzad suffered a hamstring injury while bowling and had to bat with a runner, while Tremlett was ruled out before the game due to a slight side strain.
"We're beginning to run out of bowlers now," Strauss said. "We will take stock and assess the injury situation this evening. If we need to call someone up we will."
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