Flea Destroyer should be applied in the evening, because this will give the nematodes enough time to hide under the first layer of soil in your yard and protect themselves from the bright morning sunlight. Flea Destroyer nematodes are photosensitive, but this applies primarily to the application time.
We recommend applying Flea Destroyer at the beginning of your temperate season, so that they provide protection for the entire year, and reapplying after periods of extreme weather. You can get the most benefit from Flea Destroyer by using it as a preventative – stopping the flea problem before it starts. However, you can also use Flea Destroyer to treat existing infestations. Flea Destroyer is a LIVE product, so while it will be effective very quickly, drought or frosts will lessen Flea Destroyer’s efficacy. You can apply Flea Destroyer all year around!