By radiating the worms eclosioned 3～5 days using 20～160 Gy 60C-Oγ, the sterility of Monochamus alternatus was studied. The results showed that the irradiation makes Monochamus alternatus worms to sterilize; the males are more sensitive to irradiation than females; 40 Gy is a full sterility for the worms dosage, 20 Gy is a minimum sterility dosage.
