body has stopped or has substantially stopped in one embodiment the operator cab has a control panel not shown having a light for each nozzle assembly of the sprayer 12 accordingly when a spray nozzle becomes plugged the operator is notified of the specific nozzle that has become plugged and can then take measures to service the specific nozzle so that proper flow therethrough can be resumed it is also contemplated that an audio alarm 76 may be sounded when a spray nozzle is determined to be plugged the audio alarm 76 is preferably not used to indicate which spray nozzle is plugged but rather alert the operator that any of the spray nozzles are plugged and that the operator should then view the control panel for more information in yet another embodiment it is contemplated that the sprayer 12 may have an onboard computer or similar processing device and a display unit 78 such as that illustrated in fig5 which provides a graphical user interface 80 that displays the flow rate information for each of the spray nozzles of the sprayer 12 the manner in which the flow rate information is displayed can take many forms such as average or instantaneous flow rates or as illustrated in fig5 as a percentage of maximum flow color.