Fuente: WIPO "essential oil or extracts" Some embodiments are directed to systems, methods, and formulations containing chitosan encapsulated nanoparticle pesticides. The nanoparticle solutions may contain one or more of garlic oil, clove oil, thyme oil, spearmint oil, geraniol, oxymatrine, soapbark oil, neem oil, castor oil, lemongrass oil, cedarwood oil, cinnamon oil, rosemary oil, peppermint oil, lavender oil, lemon oil, citrus oil, lemongrass oil, sesame oil, safflower oil, tea tree oil, or other essential oils with concentrations ranging from 50 to 4000 ppm. The pesticides may be used to control root-knot nematode, cyst nematode, root-lesion nematode, burrowing nematode, dagger nematode, spiral nematode, wilts, rots, blights, cankers, mites, thrips, aphids, whitefly, mealybug, gnats, slugs, midges, leafhoppers, skeletonizes, psyllids, flies, ants, and others. The nanoparticle formulations are encapsulated in a chitosan solution to create chitosan encapsulated slow-release pesticides.