Small Green Worm Like Pests

Question

Would like an organic solution to these worm like pests before the Brussels sprouts are ready to harvest or the plant is ‘toast’.

Answer 1

These are most likely broccoli worms, which also affect cabbage, cauliflower, and Brussels sprouts. These articles should help:
https://www.gardeningknowhow.com/edible/vegetables/brussels-sprouts/how-to-grow-brussel-sprouts.htm
https://www.gardeningknowhow.com/edible/vegetables/broccoli/worms-in-broccoli-caterpillars-in-the-broccoli-head.htm