الفهرس 
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Abstract
The Egyption cotton leaf worm Spodoptera littoralis
,is one of the most Ingurious insect to many >nic crops in Egypt . The insect is becoming most Lcult to be controlled. Previously, many potent >tmds were substituded with new compounds for avoiding set resistance. Therefore ,many trials were directed to »ase the insecticidal effectiveness by mixing them in Terent combinations and also by using the synergists ,
The synergised mixtures can reducC the required doses toxicants«So synergists are valuable in reducing both
)nmental Contamination and economic costs needed for :-c2ae:d.cal control programmes , In the present study, the Joint effect of insecticidal combinations was studied.
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|p6reover different chenical compounds \vere tested for their •ffectiveness alone and as synergists for various insectici¬des of different chemical structures in order to overcome increasing tolerance squired by insects in their successive