“…There is evidence that besides reducing surface tension at interfaces, surfactants are capable of exerting biochemical effects upon living organisms (Parr and Norman 1965). Some favorable effects of surfactants have been reported: Tween 20 enhances apple thinning effectiveness of napthaleneacetic acid (NAA) and is in itself a mild thinning agent (Harley, Moon and Regeimbal 1957); polyvinyl alcohol increases rate of growth and chlorophyll content in peas (Czeczuga, Rejniak and Nowak 1960); Aqua-Gro stimulates shoot growth ot barley (Endo et al 1969); and various surfactants control (Evans et al 1970;Clifford and Hislop 1975) or eradicate apple powdery mildew (Hislop and Clifford 1976;Burchill et al 1979;Clifford et al 1981) and apple scab (Burchill and Swait 1977). Some adverse effects of surfactants include phytotoxicity to apples (Burchill et al 1979), sugarcane (Singh and Orsenigo 1984), and to the roots ot ryegrass, tall fescue, Kentucky bluegrass and creeping bentgrass (Endo et al 1969).…”