nozlaf Guest January 2, 2013 11:46 am I use diluted pyrethrum as a spray around my outdoor area to keep spiders, ants and other insects away , in the areas where it doesnt get wet it lasts a long time, recently had a ant infestation in my house as a prelude to a storm, i mixed pyrethrum concentrate and petroleum jelly to make a kind of sludge that I put in the holes where the ants were traveling,