الفهرس 
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Abstract
The present study aimed to throw light on the incidance of
mites inhabiting orange varieties, population dynamics of citrus
rust mite Phyllocoptruta oleivora (Ashmead) on Navel, Balady
and Valencia orange varieties under field conditions the
susceptibility of leaves and fruits of orange varieties to
infestation by P.oleivora was estimated during two successive
years from November 1995 to October 1997. I~ addition the
relative preference of citrus rust mite to the tree directions and
tree levels on Balady orange variety were studied from
November 1995 to October 1997.
On the other hand, effect of some fungicides, acaricides,
sulfur,a plant extract and microbial pesticide were also studied
against citrus rust mite P.oleivora.
The obtained results revealed the following :_
1- During successive of cirts mite fauna in Egypt, 35 species of
13 families, and 21 genera were recorded. of these, II were
considered phytophagous ,15 predaceous, and nine with
uncertain feeding habits
2- Both leaves and fruits of orange varieties; Balady, Valencia
and Navel were infested with P.oleivora. The citrus rust mite
decreased in numbers from November until January then
increased in February until the only annual peak in August,
then gradually decreased in September and October during
,the experimental period of the two successive years from
November 1995 to October 1997.
3- The correlation between both temperature and relative
humidity, and seasonal abundance of citrus rust mite
improved that a significant positive correlation existed
between the population density of. P. oleivora and
temperature while relative humidity in spite of being
positively correlated it did not show any significant effect
during two successive years from November 1995 to
October 1997.
4- Orange varieties exhibited a considerable variability in their
susceptibility to citrus rust mite L.oleivora from which
Navel orange variety was the most susceptible to the
infestation by citrus rust mite followed by Balady and then
Valencia orange varieties during two successive years of
investigation from November 1995 to October 1997.
5- Fruits of orange varieties were more susceptible to infestation
than leaves throughout the two successive years.
6- In late spring in the first year, some mite individuals migrated
to infest the new fruits and took one month to become of
considerable values until January for fruits Balady and in
December for Navel fruits. Concerning the Valencia orange
variety, the citrus rust mite was recorded allover the year on
both leaves and fruits and causing serious damage except in
April in the second year in which was recorded with Low
numbers on fruits (30 individuals}
7- On fruits of Balady orange variety, individuals were
absolutely absent throughout the period from February until
the end of April in the first year and from March to April in
the second year.
8- On fruits of Navel orange variety, individuals ofP. oleivora
disappeared from January to March in the first year and
from January to April in the second year.
9- The citrus rust mite P. oleivora preferred the eastern side of
the tree more than northern ,western or southern during the
two successive years on Balady orange variety .
10- The lower level was the most infested with P. oleivora,
while the upper level of the tree had the least. Middle of
Balady orange trees was level were moderately infested on
Balady orange variety during the period of study .
11- The side effect of fungicides Triforine (Saprol 19 % BC) ~
Propiconazole (Tilet 100, 10 %EC) ; Fenarimol (Rubigan
12 % EC) ; Benomyl (Benlate 50 %W.P) ; Mancozeb +
copper oxychloride (Mancoper 75 % DG.) ;Dromoconazole
(Vectra 40 % FL); ; Bupirimate (Nimrod 25 % BC)
.Fostylal + Folpet (Mikal 75 %W.P) ; Hexaconazol (AntiI 5
% EC) ; Mancozeb (Nemaspor 38 %W.P); Triadimefon
(Byleton 25 %W.P) .Captan 50 %W.P ; (Sumisclex 50 %
W.P ) ; Tridemorph (Calixin 75%W .P) gave slight toxicity
except for Tridemorph (Calixin 75 %W.P) at 4S cc 1100
litres of water which gave a moderate effect on citrus rust
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mite P. oleivora~ therefore Calixin can be used in early
season to control the citrus rust mite P. oleivora at its low
population.
12-The use of the mineral oil K.Z 95 % EC at 1.5 litres l100
litres of water against moving stages of Phyllocoptruta
oleivora on citrus under field conditions at EL - Sharkia
Governorat revealed that the reduction in mite population
after 28. days of spraying averaged 64.44 % while this
percentage average was 95.4 % for the recommended
acaricide Bromopropylate (Neoron 60% EC) at
concentration of 40 cc / 100 litres of water.
13- To evaluate Sulfur 70 % W.P at 300gr/lOO litres of water
against moving stages of P. oleivora under field
conditions, results showed that, after two applications with
Sulfur the reduction average was 76.57 % on the population
density of P. oleivora.
14- Evaluation of Neemazal (Azadirachtin) at 200cc/l 00 litres of
water against the population of citrus rust mite P. oleivora
indicated that, the repellency percentage ofNeemazal was
high after 7 days and then decreased gradually after 14,21
and 28 days from application.
15- To evaluate of Biocide compound, Biofly Beauveria
bassiana, 3x107 conidiall cm3 at 100 cc / 100 litre of water
against of P. oleivora under field conitions results indicated
that .after fourth application the average reduction was
72.200/0on the population of the mite Pest