Figure 3

An example of how fluorescent surface damage marks on cotton bolls were selected and evaluated for analysis. Strongly fluorescent regions, identified with a local maxima filter, were analyzed with respect to area and intensity. One representative region has been magnified, and the two auxiliary circular regions indicated. Average intensity inside the smaller circle is denoted I₁, and average intensity inside the larger circle is denoted I₂. In instances where stink bugs or syringe needles made the puncture, the ratio of I₁/I₂ often falls below 1. On the other hand, when damage marks were found on non-infested cotton bolls, the ratio of I₁/I₂ was less than 1 in only 24% of cases.