A new character for sex differentiation of adults of Anthonomus pomorum L. (Col., Curculionidae)

Microscopic examination of adults of the apple blossom weevil, Anthonomas pomorum L. reveals distinct differences between sexes in the last two (seventh and eighth) abdominal tergites. The last two abdominal tergites in males are clearly divided by a suture, whereas the division is not visible in females, in which these two tergites form a single triangular plate. In addition, the last (eighth) abdominal tergite of the male is covered with dense setae, and is about one-third of the size of the last abdominal plate of the females. These differences permit sex differentiation of adult apple blossom weevils with complete accuracy.