Nagwan Mohamed Hamdy - Academia.edu (original) (raw)
Papers by Nagwan Mohamed Hamdy
Egyptian Academic Journal of Biological Sciences. A, Entomology, Jan 26, 2023
This parasitoid was the first time found on cowpea beetle in a high density, which necessitated c... more This parasitoid was the first time found on cowpea beetle in a high density, which necessitated carrying out an extensive morphological study of A. calandrae in order to identify it for future breeding. Additionally, it can be in future widely used in the biological management of pests that attack stored grains in general, and C. chinensis in particular
المجلة المصرية للبيولوجيا التجريبية. علم النبات, 2023
Trinomys is a genus of terrestrial spiny rats from the Atlantic Forest, and three species occur i... more Trinomys is a genus of terrestrial spiny rats from the Atlantic Forest, and three species occur in the state of Espírito Santo, eastern Brazil: T. gratiosus, T. paratus, and T. setosus. The levels of morphological variation within and among these species are virtually unknown, and their geographic ranges have not been properly assessed. These three species are externally very similar, hampering their identification in surveys and ecological studies that are not based on voucher specimens. We evaluated 162 specimens of Trinomys spp. from eastern Brazil, especially from the state of Espírito Santo, and used data from skulls, skins, and bacula to examine morphological variation and its taxonomic implications. We found extensive morphological variation in the skins and skulls even when diagnostic characters were examined, such as the number of dental lophs and bones contributing to the postorbital process. We also found variation in bacular shape among and within species, including polymorphism among individuals from the same population. The geographic range of each species in Espírito Santo was well defined: T. setosus occurred on the left (north) bank of the Doce River, and the other two species, T. gratiosus and T. paratus, occurred on the right (south) bank of this river; however, T. gratiosus was found at altitudes above 500 m, whereas T. paratus occurred below 580 m. Despite difficulties in species identification, the results of morphological and morphometric analyses are compatible with the current classification of these three species. In addition, the level of morphological variation found in specimens identified as T. g. panema-including types-falls within the range of T. g. gratiosus, confirming the taxonomic status of the former as a junior synonym of the latter.
Egyptian Academic Journal of Biological Sciences. A, Entomology, Sep 28, 2022
Insects have several sensory (sensilla) structures on their antennae, which are crucial for the c... more Insects have several sensory (sensilla) structures on their antennae, which are crucial for the concept of environmental cues as well as host recognition and positioning strategies. Sensilla thus have a significant impact on how parasite hosts locate, classify, and maybe accept a host. Based on the types, numbers, and locations of sensory organs, it is possible to deduce how they perform certain tasks. The examined biological variables are listed. The purpose of this work was to describe the external sensilla found on the antennae of Ophelimus Maskelli (Ashmead) and Leptocype Invasa (Fisher and La Salle) (Hymenoptera: Chalcidoidea: Eulophidae). In Egypt, Eucalyptus camaldulensis was primarily plagued by these two inducer insects. The sensilla have been labelled according to their distribution, size, and shape. May also use scanning electron microscopy to reveal sensory organs. On the antennae of L. invasa, sensilla were dispersed in six different types, while on the antennae of O. maskelli, they were placed in nine different types. According to this study, O. maskelli had more sensilla overall than L. invasa; along the antenna, O. maskelli had 100 sensilla compared to L. invasa more than 37 sensilla. The results from the measured biological characteristics were explained by the qualitative and quantitative differences in the sensilla types of the two species on the antenna, favouring O. Maskelli. The results tended to show that O. Maskelli was the strongest rival that could displace L. invasa.
Journal of Plant Protection and Pathology
White mango scale, Aulacaspis tubercularis Newstead (Hemiptera: Diaspididae) is a serious pest on... more White mango scale, Aulacaspis tubercularis Newstead (Hemiptera: Diaspididae) is a serious pest on mango (Mangifera spp.), (Sapindales: Anacardiaceae) which became recently a trouble some pest in all mango orchards in Egypt. Biology of the scale insect A tubercularis (Hemiptera: Diaspididae) was studied on mango saplings (Mangifera sp.) at mean temperature of 30°C and relative humidity (RH) of 64 % at the laboratory during summer and winter seasons in Department of Agriculture Ain shams university, Government of Qalyubiya, Egypt. Observations of developmental stages and morphometry of A. tubercularis were conducted using a head lens and an ocular and stage micrometers. In the laboratory conditions, mature females laid 85-200 eggs in 10-12 days under the scale cover; the eggs hatched after 6-7 days. A. tubercularis males passed through two feeding instars then pre-pupal, pupal and adult stages while females had two immature instars with pre-oviposition, oviposition and post-oviposition periods. Mean developmental span (egg to adult) of male insect was 53.5 days and for female was 67 days. The periods of the age and survival stages were almost close to the point of congruence in some stages. Mean developmental periods on mango saplings in summer were 8, 32, 2, 4, and 2 days for stages of males and 8, 32, 10, 12 and 8 days for stages of females, respectively while in winter were 8, 30, 2, 4, and 3 days for stages of males and 8, 30, 8, 12 and 12 days for stages of females, respectively.
Journal of Plant Protection and Pathology (Print), Oct 1, 2022
The structure of the female bodies of several Diaspididae species was examined using leicamicrosy... more The structure of the female bodies of several Diaspididae species was examined using leicamicrosystems. Several types of michanical sensilla for nine species were described. they were Parlatoria zizyphii ,Parlatori aoleae, Abgrallaspis mendax ,Dynaspidiotus britannicus, Hemiperlesia cyanophlli, Lepidosaphes ficus, Lepidosaphes beckii, Aulacaspis tubercularis and Diaspidiotus pronorum .The structures of antennae of the different species and antennommers of the antennae were described in P. zizyphii, A. mendax, D. britannicus,H. cyanophlli, L. ficusand A. tubercularis. By tracing the tactial hairs on the studied insect species in P.oleae, L. beckii, A. mendax, D.pronorum and D.britannicusit was found that they exist in several places and differ from one species to another, and they may be found single or double. Also, another mechanoreceptors one campaniforrn sensillum in P. zizyphii, L. beckii and L. ficus some trichodea sensilla as mechanoreceptive setae were found in the prosoma and postsoma in L. beckii, L. ficus and D. pronorum. According to these comparative studies it is hypothesized that the general organization of the sensilla is common to Diaspididae. Four sensillary patterns were recognized, with an attempt to use these data at the systematic level.
Journal of Plant Protection and Pathology
The comparative study of the female body structures of many species of Diaspididae has been done ... more The comparative study of the female body structures of many species of Diaspididae has been done using Leica microsystems. Several types of sensilla were described for three species namely: Parlatoria zizyphii, Lepidosaphes ficus and Lepidosaphes beckii. Four thermo-hygro-sensory species as sensing organs for temperature and humidity, namely plachodea in lepidosaphes beckii, sensilla basiconica and styloconica in Parlatoria zizyphii, sensilla caeloconica in lepidosaphes ficus and tuft organ in lepidosaphes ficus; One type of gustatory receptor is a styloconica in Parlatoria zizyphii; infrared receptors (IR), also in Parlatoria zizyphii; olfactory organs such as sensilla placodea in Parlatoria zizyphii. Measurements of sense organs in different species were done using ocular micrometer. Also, dimension measurements of each sensillum of temporary and permanent females mounts were done. According to these comparative studies, the general regulation of sensilla was assumed to be Diaspididae. Eight sensory phenotypes were identified, with an attempt to use these data at the systemic level. The results of this study provide an important basis for linking morphological characteristics of sensory organs to insect behavior and should stimulate the development of effective quasi-chemistry-based control strategies against species belonging to the diaspididae.
Egyptian Academic Journal of Biological Sciences, D. Histology & Histochemistry
The ovipositor is heavily populated with insect sensory structures (sensilla). Sensilla, therefor... more The ovipositor is heavily populated with insect sensory structures (sensilla). Sensilla, therefore, play a significant role in oviposition, stinging, and the process of choosing a host. Based on the types, numbers, and distributions of sensory organs, one can deduce how they function. These biological parameters have been tested. In this study, the external sensilla on the ovipositor of Leptocype invasa (Fisher and La Salle) and Ophelimus maskelli (Ashmead) were described (Hymenoptera: Chalcidoidea: Eulophidae). In Egypt, these two inducer bug species primarily affected Eucalyptus camaldulensis. Using electron scanning microscopy, the sensilla were categorized based on their size, distribution, and shape; some may even have sense organs visible. At the level of the ovipositor, it was possible to distinguish eight different types of sensilla on the L. invasa and O. maskelli species' ovipositors. With 50 sensilla along the ovipositor on L. invasa against more than 40 sensilla on O. maskelli in the current study, L. invasa had a higher overall sensilla count than O. maskelli. While results tend to suggest that L. invasa is more specialized for laying eggs than O. maskelli, it may be because O. maskelli lays eggs all over the leaf blade while L. invasa species lay eggs on the middle race, necessitating greater differentiation in the puncture area. The qualitative and numerical difference for the type of sensilla in both species on ovipositor in favour of L. invasa was what explained the results obtained from the tested biological parameters given. Despite the fact that O. maskelli and L. invasa have different body sizes in favour of L. invasa, L. invasa has a larger reproductive tract with a wider diversity of sensilla types.
Taeckholmia
Classification of nineteen taxa, belong to ten genera of family Ericaceae are studied. The study ... more Classification of nineteen taxa, belong to ten genera of family Ericaceae are studied. The study based on macro-, micro-morphological characters of seeds and SDS-PAGE analysis techniques. The phenetic relationships of the studied taxa were expressed by UPGMA-clustering method using NTSYS-pc 2.2 software. The UPGMA phenogram based on 47 characters revealed the separation of two major clusters (A) and (B). Group (A) subdivided into two sub ordinary clusters (AC), expressed subfamily Vaccinoideae, and (AD) which expressed together with main group (B) subfamily Ericoideae. The studied genera are distributed equally between these two subfamilies. Vaccinoideae is represented by five tribes: Vaccinieae, Gaultherieae, Oxydendreae, Lyonieae and Andromedeae. Ericoideae is separated as two clades representing two tribes: (AD) Phyllodoceae and (B) Rhodoreae. The produced hierarchical taxonomic arrangement typically matches the traditional classifications of the family. Clustering of Menziesia pilosa with Rhododendron menziesii in near distance with all Rhododendron taxa confirmed the placement of both genera under tribe Rhodoreae, and supports the transfer of genus Menziesia to be nested in Rhododendron as recommended by some recent cladistics analyses of DNA data.
Taeckholmia
Classification of nineteen taxa, belong to ten genera of family Ericaceae are studied. The study ... more Classification of nineteen taxa, belong to ten genera of family Ericaceae are studied. The study based on macro-, micro-morphological characters of seeds and SDS-PAGE analysis techniques. The phenetic relationships of the studied taxa were expressed by UPGMA-clustering method using NTSYS-pc 2.2 software. The UPGMA phenogram based on 47 characters revealed the separation of two major clusters (A) and (B). Group (A) subdivided into two sub ordinary clusters (AC), expressed subfamily Vaccinoideae, and (AD) which expressed together with main group (B) subfamily Ericoideae. The studied genera are distributed equally between these two subfamilies. Vaccinoideae is represented by five tribes: Vaccinieae, Gaultherieae, Oxydendreae, Lyonieae and Andromedeae. Ericoideae is separated as two clades representing two tribes: (AD) Phyllodoceae and (B) Rhodoreae. The produced hierarchical taxonomic arrangement typically matches the traditional classifications of the family. Clustering of Menziesia pilosa with Rhododendron menziesii in near distance with all Rhododendron taxa confirmed the placement of both genera under tribe Rhodoreae, and supports the transfer of genus Menziesia to be nested in Rhododendron as recommended by some recent cladistics analyses of DNA data.
Egyptian Academic Journal of Biological Sciences. A, Entomology, Dec 21, 2022
![Research paper thumbnail of Some Ecological Aspects on Mango White Scale, Aulacaspis tubercularis and Associated Natural Enemies Infesting Mango Trees in Qalyubiya Govrnorate [(Hemiptera :Sternorrhyncha :Diaspididae)]](https://attachments.academia-assets.com/111742225/thumbnails/1.jpg)
](Journal of Plant Protection and Pathology (Print), Jun 1, 2016
Ecological studies on scale insect infesting mango trees were carried out at the Farm of Faculty ... more Ecological studies on scale insect infesting mango trees were carried out at the Farm of Faculty of Agriculture , Shoubra EL-Kheima throughout two successive years 2012 & 2013. Results showed that mango trees were infested by four diaspdid species. Aulacaspis tubercularis, Lepidosaphes pallidula, Parlatoria oleae, Lidingaspis floridana Seasonal abundance of these species revealed that A. tubercularis was the most dominate species. Two hymeopterous parasitoids, Aphytis mytiaspidis and Encarsia citrini and two predacious mites one from Cheyletidae and another from Stigmaeidae, were found associated with these species. Seasonal fluctuation of different developmental stages of A. tubercularis throughout the both years, recorded three peaks for total numbers of alive population, as well as three peaks for immature stages and two peaks for adult stages. This scale insect recorded its maximum activity during autumn and early winter seasons. The natural enemies found associated with this species recorded two main periods of seasonal activity. The first period winter season, while the second during late and early summer. This diaspid species recorded 3-4 generations per year throughout the both years. Therefore, it could be concluded that the proper time for spraying mineral oil to control this pest must be during autumn after harvesting the fruits where the most insect population of immature stages as well as to avoid harmful effects on natural enemies found associated with these scale insects
Egyptian Academic Journal of Biological Sciences. A, Entomology, Jan 26, 2023
This parasitoid was the first time found on cowpea beetle in a high density, which necessitated c... more This parasitoid was the first time found on cowpea beetle in a high density, which necessitated carrying out an extensive morphological study of A. calandrae in order to identify it for future breeding. Additionally, it can be in future widely used in the biological management of pests that attack stored grains in general, and C. chinensis in particular
المجلة المصرية للبيولوجيا التجريبية. علم النبات, 2023
Trinomys is a genus of terrestrial spiny rats from the Atlantic Forest, and three species occur i... more Trinomys is a genus of terrestrial spiny rats from the Atlantic Forest, and three species occur in the state of Espírito Santo, eastern Brazil: T. gratiosus, T. paratus, and T. setosus. The levels of morphological variation within and among these species are virtually unknown, and their geographic ranges have not been properly assessed. These three species are externally very similar, hampering their identification in surveys and ecological studies that are not based on voucher specimens. We evaluated 162 specimens of Trinomys spp. from eastern Brazil, especially from the state of Espírito Santo, and used data from skulls, skins, and bacula to examine morphological variation and its taxonomic implications. We found extensive morphological variation in the skins and skulls even when diagnostic characters were examined, such as the number of dental lophs and bones contributing to the postorbital process. We also found variation in bacular shape among and within species, including polymorphism among individuals from the same population. The geographic range of each species in Espírito Santo was well defined: T. setosus occurred on the left (north) bank of the Doce River, and the other two species, T. gratiosus and T. paratus, occurred on the right (south) bank of this river; however, T. gratiosus was found at altitudes above 500 m, whereas T. paratus occurred below 580 m. Despite difficulties in species identification, the results of morphological and morphometric analyses are compatible with the current classification of these three species. In addition, the level of morphological variation found in specimens identified as T. g. panema-including types-falls within the range of T. g. gratiosus, confirming the taxonomic status of the former as a junior synonym of the latter.
Egyptian Academic Journal of Biological Sciences. A, Entomology, Sep 28, 2022
Insects have several sensory (sensilla) structures on their antennae, which are crucial for the c... more Insects have several sensory (sensilla) structures on their antennae, which are crucial for the concept of environmental cues as well as host recognition and positioning strategies. Sensilla thus have a significant impact on how parasite hosts locate, classify, and maybe accept a host. Based on the types, numbers, and locations of sensory organs, it is possible to deduce how they perform certain tasks. The examined biological variables are listed. The purpose of this work was to describe the external sensilla found on the antennae of Ophelimus Maskelli (Ashmead) and Leptocype Invasa (Fisher and La Salle) (Hymenoptera: Chalcidoidea: Eulophidae). In Egypt, Eucalyptus camaldulensis was primarily plagued by these two inducer insects. The sensilla have been labelled according to their distribution, size, and shape. May also use scanning electron microscopy to reveal sensory organs. On the antennae of L. invasa, sensilla were dispersed in six different types, while on the antennae of O. maskelli, they were placed in nine different types. According to this study, O. maskelli had more sensilla overall than L. invasa; along the antenna, O. maskelli had 100 sensilla compared to L. invasa more than 37 sensilla. The results from the measured biological characteristics were explained by the qualitative and quantitative differences in the sensilla types of the two species on the antenna, favouring O. Maskelli. The results tended to show that O. Maskelli was the strongest rival that could displace L. invasa.
Journal of Plant Protection and Pathology
White mango scale, Aulacaspis tubercularis Newstead (Hemiptera: Diaspididae) is a serious pest on... more White mango scale, Aulacaspis tubercularis Newstead (Hemiptera: Diaspididae) is a serious pest on mango (Mangifera spp.), (Sapindales: Anacardiaceae) which became recently a trouble some pest in all mango orchards in Egypt. Biology of the scale insect A tubercularis (Hemiptera: Diaspididae) was studied on mango saplings (Mangifera sp.) at mean temperature of 30°C and relative humidity (RH) of 64 % at the laboratory during summer and winter seasons in Department of Agriculture Ain shams university, Government of Qalyubiya, Egypt. Observations of developmental stages and morphometry of A. tubercularis were conducted using a head lens and an ocular and stage micrometers. In the laboratory conditions, mature females laid 85-200 eggs in 10-12 days under the scale cover; the eggs hatched after 6-7 days. A. tubercularis males passed through two feeding instars then pre-pupal, pupal and adult stages while females had two immature instars with pre-oviposition, oviposition and post-oviposition periods. Mean developmental span (egg to adult) of male insect was 53.5 days and for female was 67 days. The periods of the age and survival stages were almost close to the point of congruence in some stages. Mean developmental periods on mango saplings in summer were 8, 32, 2, 4, and 2 days for stages of males and 8, 32, 10, 12 and 8 days for stages of females, respectively while in winter were 8, 30, 2, 4, and 3 days for stages of males and 8, 30, 8, 12 and 12 days for stages of females, respectively.
Journal of Plant Protection and Pathology (Print), Oct 1, 2022
The structure of the female bodies of several Diaspididae species was examined using leicamicrosy... more The structure of the female bodies of several Diaspididae species was examined using leicamicrosystems. Several types of michanical sensilla for nine species were described. they were Parlatoria zizyphii ,Parlatori aoleae, Abgrallaspis mendax ,Dynaspidiotus britannicus, Hemiperlesia cyanophlli, Lepidosaphes ficus, Lepidosaphes beckii, Aulacaspis tubercularis and Diaspidiotus pronorum .The structures of antennae of the different species and antennommers of the antennae were described in P. zizyphii, A. mendax, D. britannicus,H. cyanophlli, L. ficusand A. tubercularis. By tracing the tactial hairs on the studied insect species in P.oleae, L. beckii, A. mendax, D.pronorum and D.britannicusit was found that they exist in several places and differ from one species to another, and they may be found single or double. Also, another mechanoreceptors one campaniforrn sensillum in P. zizyphii, L. beckii and L. ficus some trichodea sensilla as mechanoreceptive setae were found in the prosoma and postsoma in L. beckii, L. ficus and D. pronorum. According to these comparative studies it is hypothesized that the general organization of the sensilla is common to Diaspididae. Four sensillary patterns were recognized, with an attempt to use these data at the systematic level.
Journal of Plant Protection and Pathology
The comparative study of the female body structures of many species of Diaspididae has been done ... more The comparative study of the female body structures of many species of Diaspididae has been done using Leica microsystems. Several types of sensilla were described for three species namely: Parlatoria zizyphii, Lepidosaphes ficus and Lepidosaphes beckii. Four thermo-hygro-sensory species as sensing organs for temperature and humidity, namely plachodea in lepidosaphes beckii, sensilla basiconica and styloconica in Parlatoria zizyphii, sensilla caeloconica in lepidosaphes ficus and tuft organ in lepidosaphes ficus; One type of gustatory receptor is a styloconica in Parlatoria zizyphii; infrared receptors (IR), also in Parlatoria zizyphii; olfactory organs such as sensilla placodea in Parlatoria zizyphii. Measurements of sense organs in different species were done using ocular micrometer. Also, dimension measurements of each sensillum of temporary and permanent females mounts were done. According to these comparative studies, the general regulation of sensilla was assumed to be Diaspididae. Eight sensory phenotypes were identified, with an attempt to use these data at the systemic level. The results of this study provide an important basis for linking morphological characteristics of sensory organs to insect behavior and should stimulate the development of effective quasi-chemistry-based control strategies against species belonging to the diaspididae.
Egyptian Academic Journal of Biological Sciences, D. Histology & Histochemistry
The ovipositor is heavily populated with insect sensory structures (sensilla). Sensilla, therefor... more The ovipositor is heavily populated with insect sensory structures (sensilla). Sensilla, therefore, play a significant role in oviposition, stinging, and the process of choosing a host. Based on the types, numbers, and distributions of sensory organs, one can deduce how they function. These biological parameters have been tested. In this study, the external sensilla on the ovipositor of Leptocype invasa (Fisher and La Salle) and Ophelimus maskelli (Ashmead) were described (Hymenoptera: Chalcidoidea: Eulophidae). In Egypt, these two inducer bug species primarily affected Eucalyptus camaldulensis. Using electron scanning microscopy, the sensilla were categorized based on their size, distribution, and shape; some may even have sense organs visible. At the level of the ovipositor, it was possible to distinguish eight different types of sensilla on the L. invasa and O. maskelli species' ovipositors. With 50 sensilla along the ovipositor on L. invasa against more than 40 sensilla on O. maskelli in the current study, L. invasa had a higher overall sensilla count than O. maskelli. While results tend to suggest that L. invasa is more specialized for laying eggs than O. maskelli, it may be because O. maskelli lays eggs all over the leaf blade while L. invasa species lay eggs on the middle race, necessitating greater differentiation in the puncture area. The qualitative and numerical difference for the type of sensilla in both species on ovipositor in favour of L. invasa was what explained the results obtained from the tested biological parameters given. Despite the fact that O. maskelli and L. invasa have different body sizes in favour of L. invasa, L. invasa has a larger reproductive tract with a wider diversity of sensilla types.
Taeckholmia
Classification of nineteen taxa, belong to ten genera of family Ericaceae are studied. The study ... more Classification of nineteen taxa, belong to ten genera of family Ericaceae are studied. The study based on macro-, micro-morphological characters of seeds and SDS-PAGE analysis techniques. The phenetic relationships of the studied taxa were expressed by UPGMA-clustering method using NTSYS-pc 2.2 software. The UPGMA phenogram based on 47 characters revealed the separation of two major clusters (A) and (B). Group (A) subdivided into two sub ordinary clusters (AC), expressed subfamily Vaccinoideae, and (AD) which expressed together with main group (B) subfamily Ericoideae. The studied genera are distributed equally between these two subfamilies. Vaccinoideae is represented by five tribes: Vaccinieae, Gaultherieae, Oxydendreae, Lyonieae and Andromedeae. Ericoideae is separated as two clades representing two tribes: (AD) Phyllodoceae and (B) Rhodoreae. The produced hierarchical taxonomic arrangement typically matches the traditional classifications of the family. Clustering of Menziesia pilosa with Rhododendron menziesii in near distance with all Rhododendron taxa confirmed the placement of both genera under tribe Rhodoreae, and supports the transfer of genus Menziesia to be nested in Rhododendron as recommended by some recent cladistics analyses of DNA data.
Taeckholmia
Classification of nineteen taxa, belong to ten genera of family Ericaceae are studied. The study ... more Classification of nineteen taxa, belong to ten genera of family Ericaceae are studied. The study based on macro-, micro-morphological characters of seeds and SDS-PAGE analysis techniques. The phenetic relationships of the studied taxa were expressed by UPGMA-clustering method using NTSYS-pc 2.2 software. The UPGMA phenogram based on 47 characters revealed the separation of two major clusters (A) and (B). Group (A) subdivided into two sub ordinary clusters (AC), expressed subfamily Vaccinoideae, and (AD) which expressed together with main group (B) subfamily Ericoideae. The studied genera are distributed equally between these two subfamilies. Vaccinoideae is represented by five tribes: Vaccinieae, Gaultherieae, Oxydendreae, Lyonieae and Andromedeae. Ericoideae is separated as two clades representing two tribes: (AD) Phyllodoceae and (B) Rhodoreae. The produced hierarchical taxonomic arrangement typically matches the traditional classifications of the family. Clustering of Menziesia pilosa with Rhododendron menziesii in near distance with all Rhododendron taxa confirmed the placement of both genera under tribe Rhodoreae, and supports the transfer of genus Menziesia to be nested in Rhododendron as recommended by some recent cladistics analyses of DNA data.
Egyptian Academic Journal of Biological Sciences. A, Entomology, Dec 21, 2022
Journal of Plant Protection and Pathology (Print), Jun 1, 2016
Ecological studies on scale insect infesting mango trees were carried out at the Farm of Faculty ... more Ecological studies on scale insect infesting mango trees were carried out at the Farm of Faculty of Agriculture , Shoubra EL-Kheima throughout two successive years 2012 & 2013. Results showed that mango trees were infested by four diaspdid species. Aulacaspis tubercularis, Lepidosaphes pallidula, Parlatoria oleae, Lidingaspis floridana Seasonal abundance of these species revealed that A. tubercularis was the most dominate species. Two hymeopterous parasitoids, Aphytis mytiaspidis and Encarsia citrini and two predacious mites one from Cheyletidae and another from Stigmaeidae, were found associated with these species. Seasonal fluctuation of different developmental stages of A. tubercularis throughout the both years, recorded three peaks for total numbers of alive population, as well as three peaks for immature stages and two peaks for adult stages. This scale insect recorded its maximum activity during autumn and early winter seasons. The natural enemies found associated with this species recorded two main periods of seasonal activity. The first period winter season, while the second during late and early summer. This diaspid species recorded 3-4 generations per year throughout the both years. Therefore, it could be concluded that the proper time for spraying mineral oil to control this pest must be during autumn after harvesting the fruits where the most insect population of immature stages as well as to avoid harmful effects on natural enemies found associated with these scale insects