Fig. 2. A graphical interpretation of equation 6 from Baker et al. (1), with m=2, N=141250, ยต=7.427, p=0.205, =0.95 (data from Mangan et al. (6)). The solid bold line shows the probability that the consignment is below the maximum pest limit after treatment Pr(B) as a function of the survival rate after treatment s. For the selected parameter values above, this line intersects with ^{0.5} (shown by a solid horizontal line) between s=10^{5} and s=10^{6}, indicating that the survival rate after treatment required to meet the adopted maximum pest limit was lower than probit nine level, s=10^{4.5}. Thus, if the actual survival rate after treatment was probit nine level, additional pest control measures designed to reduce the pretreatment level of infestation would be required in order to comply with the adopted maximum pest limit.
Image from Plant Health Progress article:
The Maximum Pest Limit Concept Explained
