How effective is deltamethrin in killing German cockroaches?

Answer:
I found a papper published by the university of Nebraska. It can be found at:
http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1057&context=entomologyfacpub
Deltamethrin shows it to be the best choice for for most strains of German cochroaches, though it is the least effective for the Ectoban-R strain, chlopyrifos semming to be the best for it.
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