The number of respondents who saw the Rugby World Cup as a negative influence was two and a half times the number who saw it as a positive influence.
"This is not to be disparaging of the tournament itself, which, by most accounts, was an enormous success. More that it distracted folk from their day jobs, and caused expenditure switching.
"Some will no doubt have taken time off, even shuttered their businesses for a number of weeks," BNZ said.
The tournament also delayed school holiday until October from September.
The PMI showed finished stock fell to 45.2, employment declined to 48.6, new orders fell to 47.7. Production dropped to 46.4 and deliveries fell to 46.1.
BNZ hopes a back-to-work effect will help mend the PMI over coming months.
A regional breakdown showed a slump in the northern region to 46.6, its lowest result since January 2010. The Canterbury/Westland region snapped five consecutive months of expansion to decline to 48.7 but the central region remained in expansion at 52.7. The Otago/Southland region produced a strong index of 60.