Which statement describes a disadvantage of rotary spreaders?

• A. Cover a large area quickly.
• B. They require frequent recalibration.
• C. They are unable to use for granular pesticides.
• D. Apply an uneven amount over the swath, with more in the center than on the sides.

Answer: (D)

Rotary spreaders are known for throwing material outward in a spinning action, which often creates a distribution pattern where the center of the swath gets more product than the edges. This uneven application is a disadvantage because it can lead to over-application in the middle, under-application on the sides, and ultimately inconsistent pest control or turf injury unless you compensate with overlapping passes or careful calibration for the product and speed.

The other statements describe attributes that aren’t inherent drawbacks of rotary spreaders: covering a large area quickly is an advantage, rotary spreaders can be used with granular products including some pesticides, and while calibration is important, saying they require recalibration more than other spreaders isn’t the defining issue.