If Ike Davis doesn’t clean it up quickly in the cleanup spot, ticket him for a trip to Triple-A Las Vegas.

The Mets cannot afford to waste Matt Harvey’s starts. They cannot afford to have Davis continue to strike out in crucial situations.

Manager Terry Collins is counting on Davis to drive in runs, and he put the first baseman back into the fourth spot yesterday. The clock is ticking. If the lefty doesn’t hit, he could be sent down to the minors.

Such a move might be just what Davis needs to get his swing together.

Davis hit rock bottom yesterday when he struck out with runners on first and third with one out in the eighth inning of the Mets’ 3-2 loss to the Pirates at Citi Field.

He was fooled badly on a curveball in the dirt by ex-Yankee Mark Melancon. As Davis tossed his pink Mother’s Day bat aside, boos from the crowd of 28,404 cascaded onto the field.

“I definitely let the team down,’’ said a somber Davis, whose mind is spinning as much as his wild swing. “I have to produce more or I won’t play on this level.’’

If Davis had come through with a hit in that situation or even a sacrifice fly, the Mets could have made the most of Harvey’s solid start.

“I need to stop pressing with two strikes,’’ Davis admitted. “I’m telling myself to be shorter and quicker to the ball and see it, but then I’m just not focusing on the ball and I’m swinging at pitches in the dirt that normally I don’t do. Hopefully I can make that adjustment next game and start the rest of the season not doing that.’’