An emulsion concentrate (locust lotion) containing 20% v/v neem oil and 40% w/v aqueous extract of Tetrapleura tetraptera L. was found to be most stable when subjected to viscoslty measurement, creaming rate determination, droplet size analysis and accelerated stability tests. The emulsion supported the growth of microorganisms which was prevented by a combination of 0.2% w/v methylparaben and 0.1% w/v propylparaben. Octylgallate, 0.1% w/v was added as an antioxkiant to prevent the oxidation of neem oil in the locust lotion concentrate. The recommended use concentration for protection ot cassava Manihotesculenta Crantz from damage by grasshopper Zonocerus variegatus L. was 1.8–2.2%. At 2.5%, locust lotion was phytotoxic to cassava.
