Here's a list of the airports I could find. You can call to see if they provide air support for local crop dusting and ask about the specific dates. Hope it helps.
Rosecrans Memorial Airport100 NW Rosecrans RdSaint Joseph, Missouri 64503 (NNN) NNN-NNNNbr />(816)(NNN) NNN-NNNN/p>
Booze Island AirportRushville, Missouri 64484(NNN) NNN-NNNN/p>
Kansas City International Airport, Weatherby Lake, Missouri 64153(NNN) NNN-NNNN/p>
Lawlor-Justus, Faucett, Missouri 64448(NNN) NNN-NNNNlrm;
Amelia Earhart AirportPotter, Kansas 66002(NNN) NNN-NNNN/p>
Triple RDearborn, Missouri 64439(NNN) NNN-NNNN/p>