Did you know you know that rhubarb leaves will kill just about any bug.
Take the leaves off the stocks and put them in a pot with water, they should be cut up in pieces.  Fill the pot up to just about two inches from the top and then put the water to them.  Boil this for about half an hour, strain the leaves out of this and let it cool.  Put in a spray bottle adding Sunlight liquid soap, about quarter cup according to how much liquid you have, mix the two together and spray both sides of the leaves of the plants affected.  Hope this helps you out.  Great bit of info handed down from GIb, one of my readers.  Great way to fix a few bugs naturally, that is if you really need to. Most problems look after themselves if left alone.  Enjoy your day out in the garden.