This is a Spotted Lanternfly nymph (juvenile). Pesticide sprays are not needed or recommended, and since they jump readily, they will also not work very well since they will not come into contact with much of the spray residues. You can learn more about this insect on the linked page.

Miri

Correct, insecticide spraying will not get rid of them all, as even if it kills those it touches, others may wander (or later, fly) back into the area. Plus, insecticides that work well even in the short term will be able to kill other non-pest insect that come into contact with the residues, like fireflies, ladybugs, bees, and others. Lanternflies are numerous in Maryland, especially in Baltimore County this year. They won't harm the balcony or seriously injure any plants on it, so do not require treatment. We acknowledge they can be a nuisance, but sweeping, squishing, or swatting them away will be the best option.

Miri