Can I use an IGR by itself?
You can use an IGR by itself, but you would not see immediate results.I GR's only attack the non-adult stages, inhibiting future growth and reproduction. Most IGRs are combined with an insecticide to control the adult stages for immediate control since an IGR does not kill the insect.
Getting Rid of Fleas with Methoprene
Methoprene as an IGR does not kill the adult fleas. Ideally, spray methoprene before a flea infestation starts as a preventive measure. Once a flea infestation has started, mix methoprene IGR with an insecticide ( adulticide) to kill the adult fleas that will continue to hatch for about 6 weeks.
Flea Life Cycle
As you can see in the picture below, there are many more unvisible flea stages (eggs, larvae and pupae stages) than the visible flea adults. Methoprene works at the larvae stage preventing them from going to the pupae stage.
Click on image to enlarge
How toxic is Methoprene?
Even though Methoprene is very effective on fleas and mosquitoes, it has low toxicity as classified by EPA. As with all chemicals and insecticides read the label for safe usage.
How long can I store Methoprene?
Methoprene is long-lasting, inexpensive and relatively safe to use. It should hold up for about 3 years as a concentrate under moderate temperature in storage>