There are two schools of thought on insect control. Use a highly toxic material with little or no residual effect to knock down all the bugs quickly or use a less toxic, but more persistent material. Organophosphate and Carbamate insecticides provide quick kills. The newer Nicotinoid and Pyrethroid materials are much safer, less toxic and provide some residual control. The old and now banned Chlorinated hydrocarbon/Chlorcyclodine materials were both highly toxic and extremely persistent. In the old days we used Parathion, Furadan, etc. to kill them all quickly. We killed off all the bugs and whatever non-target small mammals were present, as well. No one wants to kill bunnies and quail, but it did the job. We no longer have those highly toxic materials. The closest you can get in an organophosphate is Lorsban (chlorpyrifos). In a Carbamate we still have Sevin. However, we have a host of perethroid materials that are safe and low toxicity. The problem with the safer materials is you tend to kill off the beneficial insects or predators to the pest insects due to the persistence factor. Occasional visitors like honey bees can carry those persistent materials back to the hive, because the bee survived initial contact in the field. In most cases you are better off with the quick kill and short residual. So I recommend Sevin or Lorsban.