Moffitt, L.J., & Baritelle, J.L. 1990 3.4.5 Economic Thresholds.. Armored Scale Insects, Their Biology, Natural Enemies and Control [Series title: World Crop Pests, Vol. 4B]. Elsevier Amsterdam, the Netherlands 688 pp.

Notes: Abstract: Comparison of entomologists' 'action' threshold and economists' 'economic' threshold; algebraic equations given for a simple pest-crop model; various manipulations of the model illustrate derivation of an action threshold; an efficiency-based action threshold is developed through input into the initial equations.