In this stucv. interacMns 01 all combinations 01 two insecticides Bnd eight
candidate adjuvants on physico-chemical properties. insecticidal activity and
persistence were studied. Physical compatibility between two msecucides and
adjuvants were studied by Ihe effect of adjuvants on emulsion stability of insecticides
Also. physico-chemical properties of spray solution of insecticides alone and mixed
vlilh adjuvants were studied. wh',ch were: viscosity. surtace tension. pH. conductivity
~Iinlty end (oaming layer. A cornbinatroo of adjuvants with lested Insecticides
showed physicat compatib4tity compared with either cornconeot alone. when they
added at 0.3% 8S they changed some physic.o-chemic.at properties of ins ecricides
spray sohnion. Toxicological studies proved that sY(lergislic action of e sfenvaterate
appeared when mixed with glue and phosphoric acid. Also. glue. gum and acetic acid
caused hignly synergislic effect when they added to profenofos, however the other
adjuvants showed additive and antaqonistic effects. Results of bioassays of rnixtuzes
indicated increase the effE:C1iveness of esrenvaterate and orotenofos, in decreasing
average weighl of pupa and number of eggs for cotton leafworm. The inclusion of some adjuvants in spray emulsions of esfenvalerate and
profenolos at their lull and half recommended field rates. enhanced the activity of
tested insecticides al half recommended rate. Moreover, the castor oil was highly
effect in improving the persistence at low rate. It Il'ICreased persistence of
estenvaterate at half recommended rate 10 be already similar to full recommended
rata also, to be more than full r&CQmrnenood rate in cause at oroteootos No
phyl010xicity \1-12 S observed on cotton plants. Resorts of these studies should be
useful in planning of (uture field trials 10 Increase the effectiveness and 10 manage the
rare of field apolications.