Ecompost
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yes you can foilar spray it, how successful you are at controlling pest, well let us know :-)
Worm casts, or juice/ slurry, or casts made as tea, contain both organic nutrients, and ionic nutrients, so the answer is both, it feeds plants, and microbes both now and tomorrow.
Wormcats or any insect frass/ manure having passed the digestive tract, has picked up a number of microbes on route. These microbes extract food for the worm, beetle, louse or so on and for themselves, the plants, and or other microbes besides.
Plants cant really eat organics, organics must be converted, a bit like me trying to feed you a whole chicken without cutting it up first......more often than not, this "cutting up" happens via a sequence of biology, say horses, beetles, worms, protozoa, fungi, bacteria getting smaller each time, until what was say a 90% grass and 10% mixed green plant material cow shit , in to ionic Nitrogen, Phosphorous and Potassium etc etc which is now ionic and so able to diffuse in to plant roots.
Dont forget, plants sort of just absorb everything right, they cant take a bite traditionally, so everything must be on the small side to pass in to the plant via the various roots to market as they say.
Plants have therefore, evolved to live with microbes, since microbes allow for access to plant required nutrients, and of course help to regulate stressors