leafhoppers are sucking bugs, so they won’t make much visible damage other than stippling. They are hard to get rid of because they don’t eat the surface leaf material, so any ipm other than direct application of oils (like neem) or insecticidal soaps will not be very effective.
fortunately they are usually just an annoyance, and won’t stress your plants much unless there is very high heat or very dry conditions. On their own it would take a large infestation to cause serious damage, but it does seem that leafhoppers can make plants more susceptible to other pests.