“…Plant constitutive and inducible defenses are modulated by variations in light quality generated by the canopy and associated to plant density (Ballaré, Mazza, Austin, & Pierik, ). Solar ultraviolet‐B (UV‐B; λ 280–315 nm) radiation is not only used by plants to sense competition (Boccalandro, Mazza, Mazzella, Casal, & Ballaré, ) but also increases plant resistance to herbivorous insects under field conditions (Ballaré, Cadlwell, Flint, Robinson, & Bornman, ), including soybean crops (Dillon, Chludil, & Zavala, ; Mazza, Giménez, Kantolic, & Ballaré, ; Zavala, Mazza, Dillon, Chludil, & Ballaré, ; Zavala, Scopel, & Ballaré, ). One of the main defenses induced typically by solar UV‐B radiation in leaves are the phenolic compounds (Ballaré et al, ).…”