Phytochemical compounds of leaves for cotton varieties; Giza 80, Giza 83, Giza 90 and Giza 81. 83 were studied to determine the total nitrogen, phosphorus, potassium, sodium, iron manganese and zinc to study the effect of these cotton varieties on biological aspects of the two spotted spider mite Tetranychus urticae Kock, where as individual females reared under laboratory conditions of 25úC & 30úC and 70% RH.Obtained results showed that the high percentages of nitrogen, phosphorus, the short incubation period and immature stages as well as life cycle. Therefore, significant negative correlation between nitrogen, phosphorus and life cycle of mites. Further more positive significant correlation Between mitrogen, and phosphorus and female oviopostion period and fecuntity therefore the spider mite population increased as nitrogen and phosphorus increased.
On the other hand positive correlation between leaves contents of potassium, sodium and immature stages, life cycle and negative significant correlation with ovipositon perlod and fecundity it could be conduced that high level of potassium , sodium and zinc reducing the ovipositon period and female fecundity as well as mite population
In addition to the spider mite developmeantal stages elongate with low temperature (25c) where female life cycle and longevity lasted (13.3& 12.8), (16.3 &8.5) ,(14.1&11.3) and (15.7&9.2) days when mite fed onGiza 80 ,Giza 83,Giza 90 and Giza 81.83 respectively
