Maksimova, V.I. 1991 [Methods of placing traps containing pheromone of the California scale.]. Zashchita rastenii. Moscow No. 1: 42.

Notes: A table is shown from which it is possible to know exactly on which trees to suspend pheromone traps in observations on the California scale (Quadraspidiotus perniciosus) in the USSR according to the planting scheme and the number of traps per ha.