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Hello, just stumbled across this, sorry i didnt get your message,
Karmel is the standard for working out Acumulated degree hours/days(ADD), currently theres no way of sperating the Lucilia further than genus, and all maggots have to be in the third instar to be identifiable,
for the method of working out ADD Gennard (2007) or Byrd and Castner (2001) are the the best refs i can recomend,

HTH