Dumbarton booked their place in the Scottish Cup fourth round with an emphatic 5-0 win over Alloa.The foundations of the success were laid after just 19 seconds when Donald McCallum fired into the bottom corner from 20 yards.The Championship side's lead was doubled after only 14 minutes when Garry Fleming converted a fine team move involving Grant Gallagher and Kevin Cawley.Jordan Kirkpatrick made it three when he powered a 78th-minute effort into the top corner from distance before Calum Waters slotted home a fourth in the 90th minute.There was still time for Kirkpatrick to fire in another in injury time to complete the rout.