UC Davis Ag Econ Department has put together a set of crop loss calculators in Excel.  They are generic, but also specific to lemon and avocado.  If you have had damage from the recent fire, take a look at them.  At this point it may be too early to actually know the extent of the damage, but keep these in mind for the future.

Generic calculator: https://coststudies.ucdavis.edu/tree-and-vine-loss-calculators

Avocado:  Avocado Trees, San Diego County (xls)

Lemon:  Lemon Trees, Ventura County (xls)