“The agriculture inspection stations rarely even check passenger vehicles for fruit, unless you have it in plain sight.”
A good friend works at the one on I-40 coming into Ca. This depends on what state you are coming from. If there is an agricultural pest or blight alert for something in another particular state then they will search for sure.
But even more important than agriculture they worry about boats having water pooled in the bottom and not drained that might have fry or eggs from an invasive species.
Yeah that's Quagga & Zebra Mussels usually...bad news:
https://cisr.ucr.edu/invasive-species/quagga-zebra-mussels
https://www.nps.gov/lake/learn/quagga-mussel.htm
https://www.watereducation.org/aquapedia-background/quagga-mussel