author(s)
Naira S Elmasry, Hala EM and Reda A El-Sharkawy

abstract
The toxicity effect of two different chemical synthesized nano-surfactants : anionic surfactant (N-(2-hydroxyethoxy)-O-(2-hydroxyethyl)-N-(2-(2-mono mercapto acetate)) hydroxyl ammonium-4-dodecyl benzene sulfonate) and nonionic surfactant (Di Phosphate monopoly ethylene glycol mercapto acetate, tri ethanol amine monophosphate polyethylene glycol oleiate ) has been studied. Also the effect of these nano synthetic Surfactants on physic-chemical properties and efficiency of Nasrthrin 25% EC (Cypermethrin) and Tak 48% EC (Chlorpyrifos) pesticide formulations has been measured against 2^nd instar larvae of cotton leafworm, Spodoptera littoralis (BOISD.). LC₅₀s and LC₉₀s values were measured and tabulated. Such formulations are being proven to be as effective as traditional formulations due to their inherent ability to achieve controlled delivery of their respective active ingredients. The changing in the surface tension and pH values were affected on the insecticidal activity of the tested pesticides and also affected by difference of surfactant with type of pesticide.