الفهرس 
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Abstract
-The main part of this study was to throw a beam
of light on the biochemical mechanism of Aphis gassy
pii-resistance to insecticides. Three resistant
strains of this insect were selected by usi ng pirimicarb,
cyanophos and alphamethrin as a carbamate , OP
n n d p y r e l h 1· o i d ·i n R e c t ·1 c i cl c s c o n s e q 11 e n t 1. y • The cross
-resistanc e spectrum of each resistant stra i n to 8
differc11t insecticides was also evAluated
The activity and sensitivity of AChE were determined
in the three resistant strains. More over t he
contribution of some enzymatic activities (phosphatases
and non-specific esterases) in the resistance
phenomena of~· gossypii was also bioassayed.
Finally, five synergists (each at three different
r a t j o R ) , k 11 o w 11 a s j n h i b i. t o r s f o r o x ·i d n s e s w c r e u s e cl i. n
the present study in order to select the optimum rati o
and the proper synergist for overcoming th~ resis t ance
phenomena in~- gossypii. The results could be summarized
in four main points