The neem cake has an active ingredient in it for pest control as well as many other benefits for soil.Hey @bobrown14 , can you weigh in with your thoughts on the meals added to the Coot's Mix, specifically regarding pest control? (I know they also offer some nutrient value, N I think).
My understanding is that, when added to an organic soil mix, the neem and karanja are taken up by the plant and work as systemic insecticides much like some people foliar them on to control bugs, and the crustacean/crab meal works to grow the microbes that produce chitinase which dissolves the chitin in the crab shells, but which is also found in the exoskeleton of things like thrips and mites. So that process is similar to the way a true soap works, dissolving the exoskelton and killing the bugs that way.
Do I have that essentially correct?
I tagged you on the original post, but then edited it and I think that invalidates the tag some how so you may not have seen it.
It's called azadirachtin.
The active ingredient for pests in Karanja Cake is Karanjin.
Azadactrin is systemic meaning it is taken in by roots and is passed into the plant and is weakly systemic in leaves according to Oregon State extension service.
These 2 amendments I use more for the soil building properties the pest prevention thing is a side benefit.
I've had some pest pressure from aphids last year and started to amend my older soil with a 1/4 cup of neem/karanja cake per cubic foot of soil. I've not seen an aphid for a while now without any intermediation on my part (IPM). Probably cause I'm lazy. So far so good knock woody.