I hate caterpillars…they were the reason I moved to indoor growing, we had 3 years of bad infestations, they were everywhere.
they would stop moving if you look at them, appearing like green twigs…the little black beads they drop behind is their calling card.
BTk, look for it in the insecticidal spray, it has to be the “k” variety to kill the caterpllars, other “BT” (bacillus thuringiensis, the “k” is kurstaki) kill different pests…if the plants aren’t flowering, you can be a little more aggressive but once flowering starts your choices are limited, they will affect their taste especially Neem Oil.
Spinosad is useful, too