Figure 7
From: LED-Induced fluorescence and image analysis to detect stink bug damage in cotton bolls
Boxplot of the intensity ratio I 1 / I 2 for three categories of fluorescent spots: non-infested (NINF), infested (INF), and needle punctures (NP). Fluorescent marks that are not related to a puncture generally have a higher intensity near the center. Correspondingly, the ratio I1/I2 is greater than 1 (statistically significant, Wilcoxon signed rank test, P < 0.0001). Puncture marks tend to have a darker center, and the ratio I1/I2 is less than 1. This difference is also statistically significant for stink bug feeding marks and needle punctures. Furthermore, the ratio I1/I2 is significantly higher for fluorescent marks that are not related to a puncture than for those related to stink bug feeding and those related to needle punctures (both P < 0.0001 by the Kruskal-Wallis test with Dunn’s multiple-comparison post-test).