... ,virus invades cockroach in vivo breeding, cause cockroach cells to break down dead) ,cockroach active substances and ... spacing 30-50 centimeters.2, 7-15 days for point, for the first time with the dose of 1 ... and environment.The residue is not good for human,especially for kids.Price is high than chemical ones ... is now being tested in USA in FDA for EPA Test.When is passed ,there will be more market ...