Other Answers (2)

• Chinese wasps are specie specific insect parasites. The wasps you are thinking of that moderatly effect plants are probably the oriental gall wasp.
  Chinese wasps lay their eggs on the eggs of the insect. they hatch and consume the hosts larvae. They are similar to any other beneficial insect.
  yes they should be used, benefical insects are the best form of biological control.
• lol no, u have a better chance introducing a person to solve ur problem, they will kill anything.