The curative activity of insecticides on apple maggot, Rhagolites pomonella (Walsh), larvae was tested by treating pre-infested apples with insecticides in the organophosphate, synthetic pyrethroid, neonicotinoid, oxadiazine and spinosyn classes. Apple fruit were bagged, then exposed for one week during peak apple maggot adult flight to attain a defined period of heavy oviposition. Fruit were then harvested, held for five days, and then treated in the lab with field rates of insecticides. Treated fruit were held on mesh over sand until larvae emerged and were counted. Insecticide penetration profiles of fruit were measured for each compound by collecting and freezing parallel fruit samples, boring 8mm cores, separated cores into four subsections: skin, outside 2mm of flesh, center 10mm flesh, and inside 5-10mm flesh to apple core. These samples were analyzed with HPLC or GC/MSD by the MSU pesticide analytical lab. Several compounds from the organophosphate and neonicotinoid classes demonstrated significant curative activity on apple maggot larvae.