الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
1-During the survey study, 28 species and 25 genera of mites belonging to 14 families were collected from date palm trees at different governorates of lower and upper Egypt .
2-The mites are classified according to their habits into three categories :
(a)- The phytophagous mites were: Oligonychus afrasiaticus McGregor, Eutetranychus orientalis (Klein) (Tetranychidae), Phyllotetranychus aegypticus Sayed, Raoiella indica Hirst., Brevipalpus phoenicis, (Tenuipalpidea), Mackiella phoenicis Keifer and Retracrus johnstoni Keifer (Eriophyidae).
(b)-The predaceous mites were: Phytoseius plumifer, Amblyseius swirskii (A-H), Amblyseius cydnodactylon Shehata and Zaher (Phytoseiidae), Agistemus exsertus Gonzalez (stigmaeidae), Saniosulus nudus (Eupalopsellidae) and Cheletogenes ornatus Summers (Cheyletidae) and Hemisarcoptes malus Shimer (Hemisarcoptidae).
(c)-Mites of uncertain feeding habits were: Tarsonemus stifer Ewing, Tarsonemus smithi Ewing, Tarsonemus noxius Humic. (Tarsonemidae), Tydeus californicus (Banks), Pronematus ubiquitus (McGregor) (Tydeidae), Tyrophagous putrescentiae McGregor, Calogylyphus redikorzevi (Zach), Rhizoglyphus robini Claparede (Acaridae), Heterodispus elongatus Jac. (Scutacaridae),
Brennandania silvestris and Bakerdania pectiniger Mahunka (Microdispidae); Siculobata sicula Grandjean, Zygoribatula sp. and Scheloribates sp (Oribatidae).
3-The population fluctuation of the eriophyid mite, Mackiella phoenicis Keizer, the tenuipalpid mite, Raoiella indica Hirst, and Phyllotetranychus aegypticus sayed; the tetranychid mite Oliganychus afrasiaticus McGregor and the tydied mite Tydeus californicus Banks were studied.
4-The population fluctuation of the eriophyid mite M phoenicis has one annual peak of abundance in september during June
1999 to May 2001.
5-A significant positive correlation was found among the monthly average temperature (33.7 to 33.9°C) and also with the monthly average relative humidity (80 to 85 % R.H) for abundance peak of M phoenicis.
6-The population fluctuation of the tenuipalpid mite R. indice has one annual peak of seasonal abundance in August (185 and 230 motile stages of mites) during two successive years.
7-A positive correlation existed among both the average temperature and the relative humidity with the population of the tenuipalpid mite, R.indicae.
8-R .indicae eggs have one annual peak of abundance in August during two successive years of study.
9-The population fluctuation of 0. afrasiaticus and its eggs have one annual peak of abundance in October.
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10-The average monthly temperature and relative humidity were positively affecting with the population of 0. afrasiaticus
and its eggs.
11-The population fluctuation of P. aegypticus and its eggs have two annual peaks of abundance in June and October during the two successive years of the study.
12-The population of P. aegyptiacus and its eggs were positively correlated with temperature and the relative humidity during two successive years.
13-The population fluctuation of eggs and motile stages of T. Californicus has one annual peak of seasonal abundance in October during the two successive years.
14-A sigificant positive correlation was found between temperature and relative humidity with the population density and the eggs of T. californicus
15-The biology of 0. afrasiaticus was investigated at temperature of 27 f 2°C and relative humidity 75 f 2%.
16- The larval and deutonymphal periods were longer than the protonymphal stage of 0. afrasiaticus.
17-The total mean durations of egg and immature stages (developmental time) were 12.36 and 11.1 days for females and males, respectively.
18-The pre-oviposition, oviposition and post- oviposition periods were 2.5,20-60 and 3.80 days for females.
SUMMARY
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19-The generation time for females of 0. afrasiaticus was 14.86
days. The mean total fecundity (eggs/ female) were 22.50 with a daily rate of 1-48 eggs.
20- Effect of the biocide (vertimec 1.8%) compared with acaricide, kelthane and kz oil against 0. afrasiaticus under field conditions showed that the biocide vertimec induced almost the same percent reduction over 90% as the recommended acaricide kelthane. Therefore, the biocide vertimec could be used instead of these acaricide for its safety to evironment and beneficial species, No phytotoxicity was observed with any treatments.