The Scythe is a tool that can be purchased at Red HQ for 3.5 million honey. It has a maximum pollen collection rate of about 320 per second. To get access to Red HQ to purchase the Scythe, you need to have 15 bees and discover 4 different red bee types.
The Scythe's average pollen collection rate is 177.78 pollen per second: 320 from red flowers and 106.67 from blue/white flowers.
In terms of absolute numbers, the Scythe collects the same amount of pollen per second as the Bubble Wand from the Blue HQ; however, the Scythe's shape is somewhat better suited to collecting goo.