Inversion relationship between action threshold and economic/aesthetic injury level for the control of urban and quarantine pests


V. Stejskal, Dipl.-ing., Ph. D., Research Institute of Crop Production, Drnovská 507, 161 06 PRAGUE 6, Czech Republic,


Traditional agricultural pest control IPM theory claims that the action threshold (AT) is lower than the economic (EIL) or aesthetic injury level (AIL). Urban and quarantine pests are tolerated at the zero or near-zero population level. In the cases where responsive pest control strategies are used instead of preventive ones, inherently AT should be non-zero and higher than EIL/AIL. The constraints of the implementation of preventive treatment (= zero AT) for some urban pest problems requiring the zero EIL/AIL are discussed.