Economic Injury Level (EIL)- the lowest level of a pest that will cause economic damage, ie. the level of pests where the dollar loss caused by the pest exceed the cost of control
Economic Threshold (ET) – the level of pest infestation when control should be applied to keep an increasing pest population from causing economical losses. The ET is also called the action threshold because it is the pest level where action should be taken so that economic losses are avoided.