A case of mass extermination of the San Jose scale (Quadraspidiotus perniciosus) by the ant Crematogaster subdentata.
Observations were made during 1974-76 on Quadraspidiotus perniciosus (Comst.) infesting pear trees in suburban areas in Kazakhstan (USSR). The main food-plants of the scale in this area are apple and pear, and an instance is recorded of the complete destruction of the scale in a pear orchard in August 1976 by Crematogaster subdentata Mayr. The trees were free from infestation by the end of September. It is estimated that this ant destroyed 300 scales/10 cm2 bark.