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I didn't have the answer to your question on poke greens (leaves & shoots), but went looking up some of the chemicals found in the pokeweed and their activities. So I will let you make your own decision on the part of the plant to use, after reading the following:
anthocyanin (93,000 parts per million) in fruit (pokeberries) is a pesticide
caryophyllene found in fruit is insectifuge, larvacide (your collembola have a larval stage), antileishmaniac, antistapholococcal, antistreptococcal, fungicide, candidicide, mosquitocide, pesticide
isopquercetrin found in the leaf is insecticide, pesticide
oleonolic acid found in the root is antimalarial, piscicide (kills fish)
tannin found in root is anthelmintic, pesticide
All of the above chemicals have other actions also but I was specifically researching this for your infestation. when you have plenty of time just type research on pokeweed in your search window and have fun reading about this wonderful weed.
I question whether you would get much pesticide part from the eating the leaves since it must be parboiled (and a lot of your chemicals are going to go in the water you drain out, before you finish cooking it. Plus, if you eat a lot of poke greens you are going to find that it is a excellent laxative.
I have never taken any poke root preparation, but remember reading in Earth Clinic, where someone else wrote in recommending a poke root extract & told how to make it and take it. The poke preparation I wrote about for scabies was to boil the root in water & applying to the body after it cools down. I haven't tried this either, but I have a niece who attests that it worked very well to solve her problem with scabies.
I personally took and still take pokeberries for arthritis pain problems and found it works well for that and that they weren't poisonous, as I had been told. For this I just put 20 to 25 poke berries in my mouth and washed them down with water 4 times a day. I later started extracting them in alcohol (they last for years this way versus several months when dehydrated) and usually take from 1/2 to l tsp. full 4 times a day. To figure a dosage for a child, put the child's weight in pounds over l50 (average wt. for adult) & reduce to lowest fraction. This will give you the percentage of adult dose that child should have. A 75 lb. child would get 1/2 the adult dose. When looking up the chemicals, it seemed that the berry would probably have more of the chemicals you are looking for than the leaves would.
Hope you find this helpful and if it works for you be sure and let us know. From what I read in EC, there are a lot of people looking for solutions for Morgellon's.
Has anybody else wondered where all these strange diseases are originating lately. Dear old HIV, then the flesh eating organism (now called necrotizing fascitis, when mentioned at all), now we have Morgellon's, West Nile disease mosquitos, and the latest is that dear old swine flu (for which it looks like taking the shots to prevent it is worse than having it) from what has been published on it.
