الفهرس 
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Abstract
Cotton plantation is one of the most economic ones in
Egypt. Cotton plants are infested with many pests such as
cotton leaf worm, boll worms and spider mites, At the and
of season, certain damages occur due to the heavy infestation
of spider mite. It is knovm that the low dosages of
some aoaricides affect the fecundity, hatchability of eggs
and longevity of mobile stages. Therefore the present study
was conducted to evaluate:
1) The effect of seven pesticides on the toxicity of two
spotted spider mite Tetran.,x:2_hu~ ,c:i,lmabs.rinus (Boisd,)
for the different susceptible st[,e;cs and the effect of
treatment of each stage on susceptibility of the subsequent
stage,
a, Egg stage:
According to the Lc50, slope and MLc50 , the results
of toxicity showed that JF-609JA and dicofol are
the most toxic compounds while kilval is the least
toxic whether against lab colony-eggs or against eggs
deposited from previous treated adult.
b. Nymph stage &
JF-609JA and dioofol are again the most effective
compounds while kilvs.l still the least toxic one
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against nymphs from lab-colony or those produced from
previous treated eggs.
o, Adult stage:
Data declared that the aoarioides vary to a great
deal in their effect, Dioofol and JF-609JA being the
most effective by contact followed by dimethoate and
folimat while tamaron and kilval are the least effective
acaricides, Based on molar 0onoentration (MLc 50 )
the same trend of pesticidal pot~noy is observed with
slight variation where JF-609JA ’’eoame the superior
compound instead of dioofol, P is rather interest to
nota that there is no sirpifi or’1~ variation between
the susceptibility of adult let-colony or those adults
developed from pre-treated nymphs to the tested compounds,
2) Biological tests:
a. Effect of different pesticidal concentrations on female-
feoundi ty:-