Evergreen Pyrethrum Dust will last up to 8 months and provide long lasting residual protection on just about any insect that walks over it. The main concern is that if you apply it where there is moisture than it can lose some of its potency and turn clumpy. It is not water resistant. It can be applied underneath water pipes (unless they are leaking or dripping) and just about any other avenue that insects use to gain entry. Delta Dust may be more suited to your needs. Delta Dust is water proof and provide the same results as Evergreen Pyrethrum Dust.
It sounds like the treatment that the PCO's applied had worn off after two weeks (bedbug treatments are supposed to be repeated about every 7-10 days to stop this from being a problem). Evergreen Pyrethrum Dust has the active ingredient of Pyrethrins and can take up to 1 week to kill a bedbug which is why you must use it conjunction with other products. It does seem to be coincidental that your daughter received bites the night after you applied the dust. Had she been sleeping some where else besides her room before that night? If so, the bedbugs may have simply been hiding in the wall and when she resumed sleeping in her room they were able to detect her and came out to feed. We have never had complaints of the dust causing the bedbugs to bite. If the dust has not been vacuumed up or otherwise removed, there is no reason to reapply as the dust will last for several months.
No, Evergreen Pyrethrum Dust 1% should not be burned. This is an insecticide dust that is a ready-to-use insecticide to be applied directly to cracks and crevices with a duster such as a bellow hand duster. Please refer to the product label for complete application instructions. If you would like to tell us more about the situation that you are trying to control, then we would be happy to offer additional advice.
Yes, Evergreen Pyrethrum Dust is labeled for clothes moths. You will put this product down in the areas where you have seen activity. Be sure to leave the dust down for at least 24 hours for it to settle and get on to the pests. It can then be vacuumed up. This product is not labeled to be applied directly to clothing.
Yes, Evergreen Pyrethrum Dust can be applied to dairy cattle to eliminate stable flies at a rate of 2oz per animal by shaker can, or suitable mechanical dust applicator over the head, neck, shoulders, back and legs. It is OMRI certified, please click on the link below for the certificate.