Howard writes
All of our liquid insecticides including Bifen IT should be applied in dry weather, not rainy weather. All of the liquid insecticides are made to bond to dry surfaces and will last longer when applied when it is dry and not going to rain for at least 24 hours. The temperature does not matter as much. It can be applied in hot or cold weather, but it must be dry and not wet to work at its highest potential.
Answer last updated on: 09/26/2009