How Do Plants Defend Themselves Against Insects?

How Do Plants Defend Themselves Against Insects? The first line of plant defense against insect pests is the erection of a physical barrier either through the formation of a waxy cuticle,9 , 16 and/or the development of spines, setae, and trichomes. … Spinescence includes plant structures such as spines, thorns and prickles. What do plants