"And it is expensive to look after greens - there's mowing, rolling and killing off the weeds and insects."
Insurance was also a steeply rising cost, Tasker said.
All clubs have been invited to tomorrow's meeting which is at Laird Park, one of the clubs that Tasker believes is under threat.
"Laird Park is in a bit of strife. They are down to about 60 members and have three greens to look after."
The most recent figures put bowls club membership at 700 for the Wanganui centre spread throughout 17 clubs - but that number was only going one way.
"Our members are mostly elderly and we are not getting any young ones in - they are not interested in playing bowls," said Tasker, although he reckons his Gonville club is "doing all right".
Laird Park is on land leased from the Wanganui council, as are Gonville Women and Durie Hill, and Tasker said those clubs were more vulnerable.
Clubs in the outlying areas are particularly short of numbers and Tasker said there had been moves to amalgamate Ohakune and Raetihi.
"Clubs fear they will lose their identity so they oppose it, but they will only share facilities and share costs."
He said that clubs often relied on grants from trusts but such cash windfalls were getting harder to acquire.
"We have asked the presidents of all clubs to come to the meeting, and hope for a good turnout."