الفهرس 
Introduction
General objectives of the present studyOnly 14 pages are availabe for public view
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Abstract
The present work aimed to study the biodiversity and incidence of phytophagous and predaceous mite species living on mango trees in two suburbs (Elbadary &Sahel Selim) of Assiut governorate.
The present work aimed to:
1. Survey of mite species existing on mango orchards.
2. Description oftwo new species of acarid mites (Acaridae).
3. Study the population dynamics of the harmful mite species on different varieties of mangoes.
The obtained results are as follows:
1. Ecological studies:
A. Survey of mite species:
The survey revealed the occurrence of 50 mite species belonging to 46genera and 24 families. Nine species are harmful andphytophagous, 30 species are beneficial predators and 11 species have miscellaneousfeeding habits as follow:
A.1. Phytophagous mites:
The plant feeding mites comprise9 species belonging to 9
genera within 4 families.
1. Family: Eriophyidae Nalepa:
The mango bud mite, A. mangifera is found in enormous numbers on buds of mango trees, the leaf coating, C. kenyae was recorded in low numbers on leaves of mango trees and M. mangiferae was recorded on buds in moderate numbers.
2. Family: Tarsonemidae Canestrini & Fanzago:
Only one species in this family (P. latus) accompaniment of fungi on mango orchards was recorded on leaves and buds in moderate numbers in Assiut governorate.
3. Family: Tetranychidae Donnadieu:
Three mite species pertaining to this family (the red mango mite, O. mangiferus; the two-spotted spider mite,T. urticae and the citrus brown mite,E. orientalis), were recordedon leaves of mango trees in Assiut governorate. The O. mangiferus is the key pest existingin mango trees with enormous numbers. This species was well distributed in both two studied regions and mostly collected from leaves of different mango cultivars from all studied.
4. Family: Tenuipalpidae Berlese:
Family Tenuipalpidae (Trombidiformes: Tetranychoidea) was represented by two species inhabiting mango trees. The flat mite, P. aegyptium, only one individual of this species was reported onmango leaves in El-Badary region and the Brevipalpus sp. was recorded on leaves in low numbers in Assiut governorate.
A.2. Predaceous mites:
The Predaceous mites were represented by 30 species belonging to 28genera and16 families, in association with mango orchards inAssiut governorate.
1. Family: Ameroseiidae Evans:
One species of ameroseiid mites was recorded. The K.plumosuswas found in low numbers in soil under mango trees in Assiut governorate.
2. Family: AscidaeVoigts & Oudemans:
Three species belonging to this family (Asca sp., Dendrolaelaps sp., G. bicollor), were recorded in low numbers in soil under mango trees in Assiut governorate.
3. Family: BlattisociidaeGarman:
A single species of this family (Lasioseiuslindquisti Nasr, was found in low numbers in soil under mango trees.
4. Family: CheyletidaeLeach:
The family CheyletidaeLeach,was represented by five species (C. ornatus; C. attiahi, L. gracilis, Eucheyletia sp., C. bakeri). They were found on leaves and buds of mango trees in moderate numbers in Assiut governorate. They mayfeed on scale insects because of their abundance on leaves and buds of mango trees on which scale insects are found in large numbers. This phenomenon was also recorded in Italy, China, Hawaii and in other contries (Fain et al. 2002).
5. Family: Cunaxidae Thor:
The predatory mitesof the family Cunaxidae Thor, were C. capreolus, N. ovatus and N.andrei. The C. capreoluswas found on buds of mango trees in low numbers in El-Badary region. While, both two species (N. ovatus andN. andrei) were extracted from soil under mango orchards in low numbers in Assiut governorate.
6. Family: EreynetidaeOudemans:
A single species, Ereynetes sp.was found in low numbers in soil under mango trees in Assiut governorate.
7. Family: HemisarcoptidaeOudemans:
A singleHemisarcoptes mite, H. coccophagus was recorded in low numbers on leaves in association with scale insects infesting mango trees in Assiut governorate. It is a new record for Egypt.
8. Family: LaelapidaeBerlese:
Three species of this family (i.e., G.queenslandicus, A. casalis and O. bregetovae), were found in soil under mango trees with moderate numbers in Assiut governorate.
9. Family: MacrochelidaeVitzthum:
This family was represented by only one species (M.muscadomesticae), this species was exreactedfrom soil under mango orchards with moderate numbers in both two regions.
10. Family: MelicharidaeHirschmann:
The mesostigmatic mite family MelicharidaeHirschmann was represented only one P. aegyptiacus with low numbers, from soil under mango trees.
11. Family: OlogamasidaeRyke:
The family OlogamasidaeRyke was represented by one species (G.denticus), in moderate numbers from soil under mango trees.
12. Family: PachylaelapidaeVitzthum:
The family PachylaelapidaeVitzthumwas represented by one species Pachylaelaps reticulatus (Berlese), found in moderate numbers in soil under mango trees.
13. Family: ParasitidaeOudemans:
The family ParasitidaeOudemans was represented by three species: (P. consanguineous, P.fimetorum and V. burchanensis), from soil under mango trees in moderate numbers.
14. Family: Phytoseiidae Berlese:
Species of the Family Phytoseiidae are predators of phytophagous mites and small insects, found on all plants and trees. During this study about four species were recorded on mangoes. These mites are:(Typhlodromus (Typhlodromus)athiasae,N.barkeri and E. scutalis), were recorded in high numbers on mango trees.
15. Family: StigmaeidaeOudemans:
The family Stigmaeidae Oudemanswas recorded by one species (A. exsertus), found in low numbers on leaves of mango trees.
16. Family: UropodidaeKramer:
The family UropodidaeKramer,was recorded by one genus: Uropoda sp., found in low numbers in soil under mango trees.
A.3. Mites of uncertain feeding behavior:
This group of miscellanouse mitesincluded a total of 11 species pertarining to 9 genera and 4 families, existingin mango orchards inAssiut governorate.
1. Family: Acaridae Latreille:
The family Acaridae Latreille,was represented by five species, namely:Caloglyphus sp., C. solimani, C. mahunkai, C. manure and T. putrescentiae, extracted from soil under mango trees.
2. Family: Epilohmaniidae Oudemans:
A single species (E. cylindrical), was found in soil under mango trees.
3. Family: Pygmephoridae Cross:
A single species (P. zaheri), was found in soil under mango trees.
4. Family: Tydeidae Kramer:
Three species of this family was recorded (T. californicus, T. schusteri and P. aegyptiaca). They were found with low numbers on leaves and buds of mango trees.
B. Population dynamics of two phytophagous mites associated with leaves and buds of two varieties of mango trees in Assiut governorate:
The phytophagous mites,O. mangiferus and A. mangiferae were found in association with leaves and buds of mango varieties for oneyear from March 2018 to February 2019in Assiutgovernorate.
B.1. Leaves of Zebda mango variety:
The population dynamics of the mango spider mite O. mangiferusshowed two annual peaks November and January in Assiut governorate.
B.2. Leaves of Timoor mango variety:
The phytophagous mite, O. mangiferus has a single annual peak recorded in late October in Assiut governorate.
B.3. Buds of Zebda mango variety:
The phytophagous mite, A. mangiferaehas one annual peak of population dynamics, recorded in October on terminalbuds,while in August on lateral buds.
B.4. Buds of Timoor mango variety:
The mango bud mite, A. mangiferae has three annual peaks of population dynamics, observed in July, Septemeber and November on terminal buds.
Practical Application and Recommendations:
1. Molecular identification of mite species are required along with using morphological characteristics.
2. Collaboration with plant pathologistsis also required to study malformation, caused by Fusariummoniliform var. subglutinans.
3. A test of predation efficiencyof some common predatory species on mangoes such as: E. scutalis; N. barkeriand T. athiasae.
4. More survey studies are needed in searching for unrecorded predatory mite species.
5. laboratory rearing of the common predacious mites on artificial dietsrang be required for field spreading in order to control of phytophagous ones.
6. Reporting H. coccophagus for the first time in Egypt in association with mango scale insects could be of great value as a potential biocontrol agent. Further studies should be carried out to evaluate its predation ability against sscale insects infesting mango