الفهرس 
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Abstract
v- SUMIIARY
The spider m1te ’letr8llychus urt1cae Kochis one of the
most important mites that infests the deciduous fruit trees
in Egypt. This mite causes serious injury to the orcha.rd.s
preferring the lower leaf surface around the midrib and suck-
1118 the plant sap, the injured areas becomepale then change
to rusty-brown in heavy infestation, and the leaves become
dry and fall.
During the 1sst quarter of this century the acaricides
have been widely used, the development of acaricide-resistance
to ~. urticae which attack deciduous !rui. t trees has been occurred
and costs for acaricides application were significantly
increased. Therefore, it was felt necessary to seek a new
approaches for controlling the spider mite !. urt1cae by using
biotic compound(Vertimec) and antimoulting agent (ADdalin).
The obtained results revealed the following :
1- EValuation the short’term effect of Vertimec on different
ege of eggs and moving stages of I. urt1cae, the changes
in some biological aspects after treatment with LCJQof
Vertimec against 1t 2 and ) days old eggs by dipping
technique under laboratory condition and this compound
against !. urticae under field condition on apple trees
were evaluated.
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a) To evaluate the ovicidal and adul ticidal action ot
Vert1mec against 1, 2 and J days old egg stae;es of !.
urt1cae, the sensi ti vi ty of egg stages increaB~d by the
increasing ot their ages, J-days old eggs was more susceptible
8&e th.an the others to Vertimec. The LC
50
values
were 1.13, 0.60, and 0.)0 ppm against 1, 2, and J-days old
eggs, respectively.
A~so, this result indicated that the sensitivity to the
adult stage tended to decrease in comparison to the deutonYmphal
and larval stages, the .Lc50 values of Vert1mec were
0.008, 0.052, and 0.2103 ppm against larvae, cleutonymphs
and adult females, respectively. On the other hand, the
sensitivity of the movable stages were more than the different
eggs stages ot 1. urt1cae.
b) The biological effect of Vertimec against I, 2, 3-
days old eggs of ~. urt1cae at LC)O (1.7, 1.5, and 1.09 ppm)
tor this compoundindicated that Vertimec with LC
JO ot 1,
and J-days old eggs (1.7 and 1.(9) induced redue tion in
OViposition period, longevity, life span and the average
number of deposited egg per female to 87.19 % and 88.49 %,
respecti vely, compared with the control. Moreover, it
caused 65.2.3 % and 19.17 ” mortality dUring the 1mmature
stages of !. urticae. Portunately, 100 % mortali ty during
the immature stages before the individual reached to the
adul t stages resulting from treatment with Vertimec against
2-4&78 old eggs.
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c) Also, evaluation of somedifferent concentrations of
Vertimec ()O and 40 cc/100 liter 0f water) compared with
~edifol at the recommendeddose (250 cc/100 liter of water)
under field condition against 1. urticae associated with
apple trees, the obtained results indicated that Vertimec
at 40 co/100 1i ter of water e;ave more than 90 ~ reduction
in popu1ation of 1. urticae, similar to ~ed1fol at the
recommended acaricide.
2- IIoreover~ the effect of Andalin 25 % on different 88e8 of
egs and moving stages of 1. urticae; also, the latent
effect 011 the biological aspects of the first and second
generation after 1, 2, and ,) days old eggs and larval
stages were treated with LC30of .A.ndal1nand the effect
of th1.s compoundon 1. urticae en apple trees under field
condition was studied.
a) The sensitiv! ty of embryonic development to Andalin
was more effective in l-day old eggs than 2, and )-days
old egg”. ~he LCSO was 0.203,1.07, and 16.01 ppmtor
1, 2, and )-days old eggs at !. urticae, respectively.
Also, the larval stages of !. urticae exhibited high sens1tiv!
ty against this compoundthan the protonymphal
b) ~he obtained results of the biological effect of
Alidalin at LC)Oagainst 1, 2, 3-days old egg. and larval
stages of -t. urticae reveale<1 that treated one-day old
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eggs with LC)O (1.) ppm) induced 34.50 and 58.82 ~ mortali
t.1 duriDg immature stages of ’1 and ’2· ~he reduction
perc~tages of fecund! t1 was 53.82 % in :rl’ 72.66 ~ in )12
compared with the control.
On the other hand, the treated 2-days old eggs with LC)O
(1.5 ppm) gave 55.55 ” and 28. 57 ~ mortali ty during the
immature stages and reduced the average numberof deposited
eggs per temale to 58.J8 ” and 89.35 ~ reduction ot fecUDdi
ty in P
l
and 1’2 comparedwith the control. respectively.
Also. the treated )-days old eggs with LC)O (2.4 ppm)
induced 35.73 %, 71.45 ~ mortality during the immature
stages in pland 1’, and reduced the average numberof deposited
eggs to 82.35 ~ and 93.09 ~ reduction of fecundity
compared with the control, respectively.
The treated larval stages with LC)O ().OB ppm) of .Andalin
gave 60.~ ~ in )’1 and 46.66 ” in ’2 mortali ty percentages
duriDg the immature stages and decreased the average Dumber
of deposited eggs per temale in 1’1 and 1’2- !rhe reduction
perceJlteges of f ecundity were 85 .26 ~ in ”’1 and 72.60 ~ in
’2 comparedwith the control.
c) ~o evaluate the effect of Andalin and their mixture
on 1_ urticae on apple trees under field conditiOD, the
mixtures of Andalin at 56 cc/100 11ter of water with
Kelthane at 250 ce/100 liter of water gave more than 90 ~
r
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reduction in the population density ot .!. urticae on
apple trees, it seems that Andalin improved and increased
the efficiency of Xelthane from 81.48 ~ to 93.01 , reduct~
on in the population density of 1. urticae.