Cockroach bait is either housed in a childproof-case or applied as a gel and contains a slow-working poison mixed in with an attractive food (for cockroaches). The roaches eat the poison and bring it back to the nest, where it eventually kills all the other roaches.   Place the bait in an area where you know cockroaches will encounter it, such as along baseboards, under the sink, and in corners. It should be as close to the nest as possible, so that as many roaches as possible will eat it and take it back to the nest. Most cockroach baits contain Fipronil .05% or Hydramethylnon 2% as the active ingredient. Roaches will eat the poison, then excrete it back at the nest, where other roaches will come into contact with it and die. Killing roaches using this method can take several weeks. Once the first generation of cockroaches is killed, their eggs will hatch, and more cockroaches will have to be poisoned before the nest is gone for good. Mix one part powdered (not granular) boric acid (sometimes sold as a roach-killing powder, but often available in pharmacies), one-part white flour, one part powdered white sugar. The sugar and flour attracts the roaches, and the boric acid kills them. Sprinkle the powder in the backs of drawers and cabinets, under the refrigerator, under the stove, and so on.  You can also try a similar mixture of 1-part boric acid, 2 parts flour and 1 part cocoa. Expect at least 3 cycles of disappearance/reemergence of progressively smaller hordes of cockroaches, lasting about 2 weeks each. Continue using boric acid till roaches are gone. Kids, dogs, and some other pets will eat this mixture. Boric acid is not highly toxic to humans and pets, but is for external use only, so place it where only the bugs can get it. The mixture will cake hard in humid environments, so paper or foil trays may be needed to protect your floors and cabinets.

How would you rephrase that briefly using Chinese?
使用市售蟑螂诱饵。 自制诱饵。