MSDS says Chitosan is all made from Shellfish. Chitosan comes from Chitin(pronounced KY-TIN). . Unless the vendor lists what they put in extra I can only go on what is listed. If you can provide me with something to read that states Chitosan is not the same food grade is food grade, lab grade is lab grade yada yada. It's all made from shellfish. what I have read Chitin or Chitosan will do the same at controlling Nematodes. I do not use Chitosan I use chitin. Here are a few papers on the use of Chitin for the use of controlling Nematodes.
http://www.ipm.ucdavis.edu/PMG/r280200111.html
http://homeguides.sfgate.com/crab-shell-control-nematodes-80417.html
http://link.springer.com/article/10.1007%2FBF02378855#page-1
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2629878/
Actually....
Im chopping down GG#4, Fire OG, Kosher, Lemon Cookies, Tahoe, Kandy Kush, Super Lemon Haze, Blue Dream, Cherry Pie, Jack Herer, Headband, Berkeley OG.. you think my seed grows are all Im doing... Are those Elite enough for u ?
Those are just for fun ...
They all look super dank and no DUDs...
I figured out how to fix a problem that people had no clue what was going on...actually PF mocked me by trying to clown on me about Phytoplasmas ...
Its all good... Im $tacking right now...
I'll show you my pics in a few days Tarzan... your right its not just Chitosan... the 2 other things you need to save your ass are not mentioned... and I'll keep them to myself...
I've been there and done that...
Waveguide beware the leafhoppers .. they can infect cannabis with asters yellow aka phytoplasma
chitin breaks down into chitosan by way of the plant detecting the chitin and releasing chitinase to make chitosan.
using chitosan or chitosan oligo is like a more potent readily available version, which is also more pricey. the chitosan oligo is some sort of further broken down version of chitosan but with a special molecular chain or something like that.
i'll stick with chitin and neem meal in my soil. diatomaceous earth on the top layer and in foliar.... insect frass is pricey imo and i havent heard too much about it.