This is particularly the case where the presence of herbivorous insects is not always predictable.
"Plant water stress and its consequences for herbivorous insects: a new synthesis".
Birds and mammals alike play a large role in pest control by eating many herbivorous insects.
Tree predators (especially herbivorous insects) are limited by the ease of movement.
The ants live inside the plants' hollow stems and protect them from herbivorous insects.
They were the first major group of herbivorous insects.
A grasshopper is a common type of herbivorous insect.
The trees benefit because the ants attack herbivorous insects and either drive them away or feed on them.
In turn, the ants protect developing seeds from herbivorous insects.
The coqui has essentially become the species which controls the population of herbivorous insects.