  Attractant-based trap networks targeting insects are ubiquitous worldwide.
These networks have diverse targets, goals, and efficiencies, but all are
constrained by practical considerations like cost and available lures. An
important way to balance goals and constrains is through quantitative
mathematical modeling. Here we describe an extension of a computer model of
trapping networks known as "TrapGrid" to include an alternative mode of
calculating the probability of capture over time in a trapping network: Strict
detection ("capture of one or more") compared with the average probability of
capture as implemented in the original version. We suggest that this new
calculation may be useful in situations of low prevalence where trap network
operators wish to interpret the meaning of zero captures at a small scale. The
original remains preferred for comparing the sensitivity and suitability of
alternate trap networks (i.e. density of traps, their placement, lure
attractiveness, etc.).
