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The Repellency Myth Are Pyrethroids Really Repellant?
For years we have been hearing from manufacturers and studies that pyrethroids are repellent yet where are the studies to prove it. I even talked about it in a previous podcast on repellency.
I have spoken to many manufactures reps tell me that pyrethroids by nature are repellents and have sat though ceu classes where this is mentioned, read dozens of studies where they mention this and yet I can’t find any studies where a specific pyrethroid was used on a specific species and showed repellency.
Daniel Dey III brought this up on a post in the pest cemetery and it has good validity
I have come to a point in my life where I need to be a Berean, for those who do not know what a Berean is it was a group of Greek Jewish people at the time of Christ that Paul claims they were more noble meaning of higher thinking because they listened to what he taught without arguing and went back to look at the Torah to confirm everything.
Laboratory Evaluations of Insecticide Product Efficacy for Control of Cimex lectularius
“This study also determined that pyrethroid products were not repellent to bed bugs and would not cause bed bug aggregations to scatter or avoid treated surfaces.”
EXCITO-REPELLENCY OF DELTAMETHRIN ON THE MALARIA
VECTORS, ANOPHELES MINIMUS, ANOPHELES DIRUS, ANOPHELES
SWADIWONGPORNI, AND ANOPHELES MACULAZUS, IN THAILAND http://www.biodiversitylibrary.org/content/part/JAMCA/JAMCA_V20_N1_P045-054.pdf
Irritability and repellency of synthetic pyrethroids on an Aedes aegypti population from Thailand
It was found that cyphenothrin had a stronger repellent effect than the other pyrethroids, while the contact irritant effect was similar among compounds tested.
Lambda-cyhalothrin (Technical Fact Sheet)
Lambda-cyhalothrin has repellent properties.
REPELLENCY, LETHAL TIME, AND TRANSFERENCE OF RESIDUAL
INSECTICIDES USED FOR PHARAOH ANT CONTROL by DAVID ANTHONY MELIUS
Both fipronil and lambda-cyhalothrin effectively killed pharaoh ant workers and
queens when they were exposed to the treatment. No degree of repellency was found for either insecticide.
Comparative Toxicity and Repellency of Microencapsulated and Other Liquid Insecticide Formulations to the German Cockroach (Dictyoptera: Blattellidae)
These data demonstrate the difficulty in making generalizations about the relative performance of ME compared with EC or RTU formulations.