highly significantp-value<0.001
Our results showed that the relationship between the field measured defoliation and through UAS multispectral images with ITDe or MCDe was highly significant (p-value<0.001), and that the model’s predictive accuracy was very high in both cases (R 2 = 0.91 for ITDe and R 2 = 0.93 for MCDe). 4.