That treehugger article appears to have several factual mistakes.
I went through some of my old links to respond to it, and I did learn a few things. The 40% solution, at least in 2004, was in a kit designed for an individual to apply. Since the treehugger US Navy link isn't working for me, there is the possibility the recommendation was changed to a licensed applicator. (I actually find that wording extremely improbable. I'd expect a recommendation like that to require a specific occupational code coupled with specific training.)
I'm going to continue to follow
this advice to use both permethrin and DEET. That link worked when I tried it just now.
This study shows permethrin is more effective than DEET for protection from ticks. The table on page 3 (fifth page in?) shows drastically more normal condition ticks using DEET and many more dead ticks using permethrin. {Edit---the link apparently doesn't work. Click on the highlighted link to get back to the journal search form, type "permethrin deet" into the search, and look for the 3rd (?) result, which is titled, "COMPARATIVE FIELD EVALUATION OF PERMETHRIN AND DEET-TREATED MILITARY UNIFORMS FOR PERSONAL PROTECTION AGAINST TICKS (ACARI)"}
I somewhere have a link for a comparison of mosquito bites using DEET alone, permethrin alone, and the two in combination. There is a reason the DOD recommends using both in combination---It works. For some reason they only consider DEET for skin and Permethrin for clothes---This study linked in the above paragraph is unusual in that it puts DEET on clothes.)
If you want to find more to read than you'll ever care to on the subject, go to the Armed Forces Pest Management Board (
www.afpmb.org/), go to the document/pub search, and search for studies with both permethrin and DEET.
I have two problems with the treehugger article (other than the fact he's recommending DEET (N,N-diethyl-m-toluamide) as an "environmental solution").
First. DEET is volatile. It's not clear if a plastic bag will give you long-term "storage" of the DEET. It's likely to just diffuse right through it.
Second. He says nothing about the potential health problems from DEET. Go search google for "DEET seizures" and you'll find links like this:
www.cdc.gov/mmwr/preview/mmwrhtml/00001475.htm
(If you read this whole thing, you'll see they're showing a risk, but recommending to use DEET anyway. I especially like this part: "DEET has been marketed in the United States since 1956 and is used by an estimated 50-100 million persons each year. Since 1961, at least six cases of toxic systemic reactions from repeated cutaneous exposure to DEET have been reported...".)
To wrap all this up. I've had lyme disease. Go read some lyme disease horror stories, and then decide whether the risk of DEET combined with permethrin compares to the risk of lyme. I use both. For lyme (or TBE) areas I use the 33% DEET lotion (3M Ultrathon) from the first link---other (non-Lyme) places I use DEET spray because it's easier.) Try to wash your hands after touching DEET because it'll melt your plastic watch.
I was in Umstead (near Raleigh, NC), and there were ticks everywhere. I saw one jump onto me from a little tree as I pushed through some green. It hit my shirt and jumped off---It apparently did not like permethrin.
I spray my shoes, too. One person told me he has found more than 50 larval stage ticks on his shoes (from one day in Umstead at the height of the larvae).
And do not sit in your car to change. The ticks like the heat and jump off you into the car, and then they get you later. That's how I got Lyme. I had on protected crew socks in the woods, and I had sprayed DEET on my leg above the sock. Afterwards I switched into ankle socks and had a ring of no DEET right at my ankle, and 10 days later that's where I got the bullseye EM rash. Someone else had sat in the car to change, and one apparently got on me during the 10-hour drive home.