Turbines are not significantly different from other obstacles for crop-dusters; they require navigation around them, but can typically be accommodated with proper siting practices. Wind developers typically work with landowners to ensure that they can continue all farm operations, and it can be negotiated into lease agreements if turbine placement will cause crop-dusting costs to increase.
Perhaps of greater concern than turbines for crop-dusting practices are the meteorological evaluation towers (METs) that are put up to evaluate wind speeds prior to a wind farm being constructed. These structures do not have any turbine blades, but are more slender (i.e. harder to see) and are held in place with guy wires, which can pose additional hazards and bigger risk to crop-dusting pilots. The FAA recommends that METs under 200 feet are lighted and marked so that they can be more easily noticed.