gardening tragedy

Our tree collards, some of our very favorite plants to grow, have been infested with harlequin bugs.  Sadness!  I was like, "Let's pick some tree collards to make stir fry with," and yelled, "Oh my god!" over and over again when I saw how bad it was. 

All four of the plants are like this.  The bugs are crawling, flying, mating, laying eggs...  Ming got a bucket of soapy water and started picking them off the plants.  I helped him, smashing bugs between my gloved fingers.  We killed at least 200 bugs and didn't even put a dent in it.  We don't know what to do other than denude the plants, hope the bugs all die or leave, and start over. 

Any ideas?