Put about a table spoon of dish soap in a quart of water and spray the plants with that.

Or you can try the Cayenne Pepper, garlic, onion, recipe in the link below.

All Natural Cayenne Pepper Insect Repellent

Have a problem with chirping ciacadas or mosquitoes or bugs? Use cayenne as the base for an insect spray. I can't take credit for this formula that I"m about to give you but I can take credit :) for thinking it could be a useful solution. Why? Whether you believe in evolution, nature, or Intelligent Design or God, bugs don't like peppers.

The capsaicin, the active ingredient in peppers that give them their heat, is something bugs instinctively avoid and understandably so. Even human beings, sentinent beings that we are, avoid eating peppers as we don't like the heat of the peppers, which is perfectly understandable.

So, that said, I went to a book by John Heinerman, Ph.D. for some guidance. Heinerman has written a number of books on health (I have four of them in my library) and I've learned to trust his knowledge and expertise. In his book, The Health Benefits of Cayenne, he said this about using cayenne as an all-natural insect repellent, "Most insects absolutely detest the pungent component in cayenne pepper" (p. 37). I was happy as it confirmed my instincts. He then gives his formula that I pass on to you now.

cayenne pepper powder"In a blender, mix together two tablespoons of cayenne pepper, two cloves of garlic, four small white onions, and cook in one quart of water for a minute and a half. Strain and dilute in two gallons of water with two tablespoons of Ivory soap. Spray on plants to kill virtually all bugs. Scatter a heavy and generous quantity of cayenne pepper around spring bulbs in flower to keep away squirrels and other pesky varmints. Nor will cats be inclined to dig in flower beds sprinkled with a lot of cayenne pepper. The cayenne won't hurt any of the flowers" (p. 38).

If you don't want to go to all that trouble, just try to put a good, heaping tablespoon of hot cayenne pepper powder in a spray bottle, fill it with water, and spray it in the areas you want to prevent insects from bothering you. It acts as a good all natural mosquito repellent if used like this and it disturbs ciacadas so they don't disturb you with their incessant chirping. When you get near ciacadas, they stop chirping, which is a natural survival instinct. No problem. Just spray the cayenne all around the area you think they are -- just deluge the area. They will leave.

http://www.cayennepepper.info/cayenne-pepper-and-animals.html