Mansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Comparative Morphology and Chemical Composition of Plant Leaf and their Relation with Population Density of Certain Piercing- Sucking Insect Pests31374613610.21608/jppp.2017.46136ENM. H.BayoumyEconomic Entomology Department, Faculty of Agriculture, Mansoura University, Mansoura, EgyptS. S.AwadallaEconomic Entomology Department, Faculty of Agriculture, Mansoura University, Mansoura, EgyptM. A.El-GendyPlant Protection Research Institute, Agricultural Research Center, Giza, EgyptNagwan E.El-LawatayPlant Protection Research Institute, Agricultural Research Center, Giza, EgyptJournal Article20190828Both leaf morphology and chemistry play a potential role in predicating with the population density of organisms. The current study was conducted, at the experimental farm of Mansoura University, to examine the effect of host plant species and their morphological (trichome density, thickness, and length) and physiological ((i.e., total protein, total carbohydrates, NPK) characteristics on population density of some piercing-sucking insect pests during two successive growing seasons.The number of <em>Aphis</em> spp. was positively correlated with the higher ratios of total protein, total carbohydrates, and N of squash leaves. While the numbers of <em>Bemisia </em>spp<em>.</em> and <em>N. viridula, </em>were positively correlated with the higher ratios of P and K of eggplant leaves. In contrast, <em>Empoasca</em> spp. exhibited higher populations on common bean leaves that were poor in all chemical compounds. Host plant species significantly affected the population density of all insects investigated. Squash harbored the higher numbers of <em>Aphis</em> spp., eggplant harbored the higher numbers of <em>Bemisia </em>spp.and <em>N. viridula</em>, and common bean had the higher number of <em>Empoasca</em> spp. The populations of aphids, whiteflies, green bugs, and leaf hoppers varied among leaf morphological types. Whitefly and green bugs exhibited significantly higher density on eggplant with more hairiness and hair length, whereas aphids had significantly higher populations on squash leaves with higher hair thickness. Common beans, with lower magnitude of density, thickness and length had the higher populations of leafhoppers. Based on leaf features and their chemical composition, common bean seems to be more resistant against infestation with aphids and whiteflies, squash against green bugs, and eggplant against leafhoppers.https://jppp.journals.ekb.eg/article_46136_6b9c35f58d08825fb999c09e4b46d338.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201A First Study on the Effect of Some Physical Barriers to Prevent Termite Attack in Egypt39434613910.21608/jppp.2017.46139ENA. R.EL-BassiounyAgric. Res. Center (ARC), Plant Prot. Res. Inst., Dokki, Giza., EgyptH. M.AhmedAgric. Res. Center (ARC), Plant Prot. Res. Inst., Dokki, Giza., EgyptM. A.BattAgric. Res. Center (ARC), Plant Prot. Res. Inst., Dokki, Giza., EgyptJournal Article20190828Field experiment was conducted in year 2016 for the first time in Egypt, at Sangha, Kafr Saqr, Sharkia Governorate, to study some physical barriers " Metal shield, breaking glass, thick plastic bags, gravel and gravel with termiticide " against subterranean termite, <em>Psammotermes hybostoma</em> (Desneux). Data showed that, metal shields (Galvanized iron) and gravel with termiticide were strong barriers prevent termite attack, followed by thick plastic bags barrier which prevent the termite crossing for five months; then breaking glass barrier where the termite was able to creative some tunnels from which, while the gravel barrier failed to prevent the termite from crossing and creative the tunnels. Highly significant differences were recorded between the tested treatments.https://jppp.journals.ekb.eg/article_46139_30b5d7716b46842e699d8442d9bcb5a2.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Down-Regulation of Damping-off and Root Rot Diseases in Lentil Using kinetin and Trichoderma.45544614110.21608/jppp.2017.46141ENK. M.Abd El-HaiPlant Pathology Research Institute, Agric. Res. Cent., Giza, Egypt.Abeer A.AliPlant Pathology Research Institute, Agric. Res. Cent., Giza, Egypt.Journal Article20190828Damping–off and root rot diseases caused by several soil-borne pathogenic fungi are the most responsible for high reduction in lentil yield. The aim of the present study is to evaluate the efficiency of kinetin and <em>Trichoderma</em> for controlling these diseases and lentil productivity compared with Rizolex-T50 fungicide. <em>Rhizoctonia solani</em> and <em>Fusarium oxysporum</em> are the common causal pathogens which isolated from infected lentil collected from different fields of Dakahlia Governorate, Egypt. In greenhouse: both tested fungi were pathogenic and caused pre- and post-emergence damping-off. Lentil cultivar Giza 9 was more susceptible for infected with both pathogenic fungi. <em>F. oxysporum</em> was most aggressive in post-emergence damping-off. On the other side, Rizolex-T50 recorded the highest reduction in emergence damping-off in both lentil cultivars, <em>Trichoderma harzianum</em> come next. Anatomically, <em>R. solani</em> caused complete disruption of the epidermal and cortical cells in both cultivars of lentil roots, Giza 9 was very affective. In field: Lentil; Giza 4 cultivar was more tolerant for infected with damping-off and root rot diseases under natural infection. The application of both <em>Trichoderma</em> species and two concentrate of kinetin led to significant reduction in damping-off and dead plants. <em>T. harzianum</em> was more effective. Giza 4 was the best cultivar in photosynthetic pigments as compared with Giza 9. Except Rizolex-T50, all treatments increased significantly photosynthetic pigments. Kinetin at 100 ppm was more effective. Meanwhile, <em>T. harzianum</em> gave the highest values of total phenols content. Kinetin at level 100 ppm gave the highest average of growth parameters (plant height and branches number plant<sup>-1</sup>)and yield components (pods number plant<sup>-1</sup>, 1000 seed weight and seed yield (kg/fed)). Giza 4 cultivar recorded the highest yield, while Giza 9 was the best in seed quality. The highest seed protein% occurred under the application of <em>T. viride</em>. Meanwhile, kinetin at 100 ppm gave the high phosphorus percentage in the seed of lentil. Therefore, application of kinetin at 100 ppm as well as <em>T. harzianum</em> as seed soaking could be recommended for controlling soil-borne diseases in addition to improving growth and productivity of lentil.https://jppp.journals.ekb.eg/article_46141_3dd7aeda6d5084ab464cccb5f705a840.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Biological Aspects of the Theridiid Spider Theridion Melanostictum Cambridge (Araneida: Theridiidae) Fed on Different Prey55584614210.21608/jppp.2017.46142ENM. M.AhmedZool. and Nemat. Dept. Fac. of Agric., Cairo, Al-Azhar University.M. A. M.MohafezZool. and Nemat. Dept. Fac. of Agric., Cairo, Al-Azhar University.M. M.El-SebaayPlant Protection Research Institute, A.R.C., Dokki, Giza, Egypt.A. M.MansourPlant Protection Research Institute, A.R.C., Dokki, Giza, Egypt.Journal Article20190828<em>Theridion melanostictum </em>spider was collected from El-Ameria region, Alexandria governorate in 2016 on citrus plants and reared under laboratory conditions of 25±2°C and 60-70 % R.H. when fed on the cotton leaf worm <em>Spodoptera littoralis </em>Boisd. and <em>Gynaikothrips ficorum</em> (Marchal). Spider males and females passed through four spiderlings of male and five spiderlings for female. The incubation period lasted 12.2 and 15.2 days for female and 12.2 and 15.2 days for males when fed on <em>S. littoralis</em> and <em>G. ficorum</em>, respectively. During the total immature stages of <em>T. melanostictum</em>, the spider durated 59.6 and 38.2 days for female and male spiderlings, respectively when the individuals fed on <em>S. littoralis</em> and averaged of 88.6 and 63.0 days in case of feeding on <em>G. ficorum</em>, respectively. The life cycle of <em>T. melanostictum</em> averaged of 71.8, 50.4, 103.8, 78.2 days for female and male fed on a aforementioned preys, respectively. The spider longevity lasted 59.6, 36.4, 72.2 and 44.4 days for female <em>Longevity</em> and 59.6, 36.4; 72.2, 44.4 days for adult food of males individuals when reared on the some prey mentioned before, respectively. The preoviposition period lasted 13.82 and 15.62 days when females fed on <em>S. littoralis</em> and <em>G. ficorum</em>, respectively. The total mean number of consumed individuals of <em>S. littoralis</em> and <em>G. ficorum</em> was 148.0 and 414.8 prey for the total spiderling female, respectively. These values changed to 100.6 and 307.2 preys, respectively. The average number of consumed prey per adult female of <em>T. melanostictum</em> was more than those of male, as, the number of prey consumed was 137.0 and 94.0 prey of <em>S. littoralis</em> during the feeding of spider female and male, respectively. However, the average number of consumed <em>G. ficorum</em> during the life of <em>T</em>. <em>melanostictum</em> female was 200.8 prey and 89.0 prey of <em>G. ficorum</em> during the feeding of spider males. The mean number of consumed prey was 41.8 and 36.8 individuals of <em>S. littoralis</em> and <em>G. ficorum</em>, respectively during the pre-oviposion period. The average number of devoured prey was 58.2 and 97.0 prey of both prey during the oviposition period of spider female, respectively, while the spider consumed 37.0 and 68. prey, in case of the post-oviposition period, respectively. It was noticed that the average number of consumed prey per female was more than those of males. Moreover, spider preferred feeding on cotton leaf worm than thrips.https://jppp.journals.ekb.eg/article_46142_f7f4a469bac5154741f93b9fa9898ff5.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Efficiency of Different Control Methods Against the Cotton Pink Bollworm Pectinophora gossypiella (Saund.) in Cotton Fields in Egypt59644614510.21608/jppp.2017.46145ENA. DarwishZoology Dept., Faculty of Science, El-Mansoura University, El-Mansoura, EgyptA. A.KhidrPlant Protection Research Institute, Agricultural Research Center, Giza, EgyptA. H.El-HeneidyPlant Protection Research Institute, Agricultural Research Center, Giza, EgyptHuda I.Abdel-AliemPlant Protection Research Institute, Agricultural Research Center, Giza, EgyptJournal Article20190828In Egypt, the pink boll worm (PBW), <em>Pectinophora gossypiella </em>(Saund.) (Lepidoptera: Gelechiidae) is a serious mid- and late-season cotton pest that causes severe damage. Trials included; releasing of the egg parasitoid, <em>Trichogramma evanescens</em> (West.) (Hymenoptera: Trichgramatidae) and/or mass-trapping of the male moths of PBW compared with the conventional insecticide applications; for controlling the pest were carried out in the cotton fields in Menoufia Governorate, Egypt during the two cotton growing seasons of 2013 and 2014 to compare the efficiency of different methods against the pest. Nine parasitoid releases were undertaken in each season. Mass-trapping of the PBW moths showed the highest reduction in the green bolls’ infestation, followed by releases of the parasitoid alone, while the insecticide applications recorded the highest infestation rates during the two seasons. Seasonal reduction percentages in green boll infestation at the parasitoid release and the mass-trapping plots attained (30.65 and 43.1% in season, 2013 and 37.66 and 49.77% in season, 2014), respectively, opposed to (37.78 and 47.30%) at the insecticide application plot. Therefore, integrated pest control programs are highly recommended against the cotton pests, especially the boll worms, in Egypt.https://jppp.journals.ekb.eg/article_46145_b0f73bead785f38649985a4261ccd5e5.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Effect of Food Type on Life Tables and Feeding Behavior of the Ascid Mite, Lasioseius athiasae (Acari: Ascidae)65684614610.21608/jppp.2017.46146ENAlyaa A.TawfikPlant Protection Research Institute, A.R.C, Dokki, Giza, Egypt.Amira E.MesbahPlant Protection Research Institute, A.R.C, Dokki, Giza, Egypt.Doaa A.Abou El-AttaPlant Protection Research Institute, A.R.C, Dokki, Giza, Egypt.Walaa R.Abou ZaidPlant Protection Research Institute, A.R.C, Dokki, Giza, Egypt.Journal Article20190828The ascid mite <em>Lasioseius athiasae</em> Nawar and Nasr considered an important predator related with herbaceous plants, fallen leaves and deciduous fruit tree debris <em>M. incognita</em>. When female predator provisioned <em>T. urticae</em> nymphs, the rm was 0.102 individual/ female per day. Thus, it could be concluded that the highest reproductive rate which observed from the mould mite and the bulb mite compared with feeding on other prey species.https://jppp.journals.ekb.eg/article_46146_c61dd0e16cc91141806a288f3e325955.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Life History of Caloglyphus manure, Sancassania (caloglyphus) berlesei and Tyroghagus putrescentiae (Acari:Acaridae) Feeding on Root-Knot Nematodes, Meloidogyne incognita .69724614710.21608/jppp.2017.46147ENDoaa A.Abou El AttaPlants Protection Res. Institute , Dokki, Agric. Res. Center, Giza, EgyptMariam G.HabashyPlants Protection Res. Institute , Dokki, Agric. Res. Center, Giza, EgyptAmira E.MesbahPlants Protection Res. Institute , Dokki, Agric. Res. Center, Giza, EgyptAlyaa A.TawfikPlants Protection Res. Institute , Dokki, Agric. Res. Center, Giza, EgyptJournal Article20190828The biology and life table of three acarid mite,<em> Caloglyphus manure </em>Eraky&Osman<em>,</em> <em>Sancassania (Caloglyphus) berlesei</em> (Michael) and<em> Tyroghagus putrescentiae </em>(Schank) <em> </em>fed on the eggmasses of root-knot nematode <em>Meloidogyn. incognita</em> (Kofoid and White),at 25 ͦC ±1 and R.H 70±10%. Life cycle durated 13.52, 7.92 and 12.6 days for female and 13.17, 7.31 and 11.29 for male of <em>C. manure,</em> <em>S. berlesei</em> and<em> T. putrescentiae,</em> respectively .Female life span averaged 32.72,28.47 and 36.75 days while these of male averaged 19.23, 25.7 and 31.29 days. The mean generation time (T) averaged 19.45, 12.27 and 17.75days,while net reproductive rate (R<sub>0</sub>) values were 83.81, 94.53 and 117.04 time of the aforementioned three mites, respectively.The net rate of natural increase (r<sub>m</sub>) was0.227, 0.370 and 0.268 individual /♀/day, while the finite rate of increase (e<sup>rm) </sup>averaged 1.255, 1.44 and 1.307 time /♀/day of <em>C. manure,</em> <em>S. berlesei</em> and<em> T. putrescentiae,</em> respectively. The results indicate the possibility of using <em>Caloglyphus manure,</em> <em>Sancassania berlesei</em> and<em> Tyroghagus putrescentiae</em> in controlling <em>Meloidogyn. incogni</em><em>ta . </em>https://jppp.journals.ekb.eg/article_46147_85af1a6269a8b679a72d97f6b90a3ae9.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Beneficial Insectary Plants and Habitat Management for Enhancing Activity of Some Insect Predators of Bemisia tabaci and Tuta absoluta in Tomato Fields.75824614810.21608/jppp.2017.46148ENAmal E.MaroufAgric. Res. Center (ARC), Doki, Giza, Egypt.Journal Article20190828During the course of the present study, five insect predators were recorded with relatively high numbers on chamomile ( <em>Matricaria chamomilla</em> L), namely <em>Nesidiocoris tenuis</em> (Reuter ), <em>Macrolophus caliginosus</em> Wagner. ,<em> Coccinella undecimpunctata</em> L., <em>Chrysoperla carnea </em>Steph. and <em>Syrphus corollae</em> Fabr. Only three insect predators were inhabiting marigold plants (<em>Callendula officinalis </em>L<em>.</em>) with relatively high abundance, namely <em>N. tenuis</em>, <em>M. caliginosus</em> and <em>C. undecimpunctata</em>. The obtained results indicated that intercropping chamomile and marigold plants with tomato crop significantly increased the abundance of the mirid bugs, <em>N. tenuis</em> and <em>M. caliginosus</em> in comparison with those in check plots. In addition, floral resource plant caused considerable reduction of both <em>Bemisia tabaci</em> and <em>Tuta absoluta</em> populations in comparison with no forbs field. Therefore, our results suggest that chamomile, and marigold are beneficial insectary plants and could be used as conservative biological control agents against <em> B. tabaci</em> and <em>T. absoluta</em> in tomato crops.https://jppp.journals.ekb.eg/article_46148_735b2f0f2989bb71579ad66abc7c6ec8.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Influence of the Different Wheat Varieties on the Population Density of the Main Aphid Species in Kafr El-Sheikh Region.83864615110.21608/jppp.2017.46151ENS. S.AwadallaEconomic Entomology Department, Faculty of Agriculture, Mansoura University, Mansoura, EgyptS. B.BelehField Crop Insect Pest Department,Plant Protection Research Institute, Agricultural Research Center, Sakha, EgyptMohsena R. K.Mansour2Field Crop Insect Pest Department,Plant Protection Research Institute, Agricultural Research Center, Sakha, EgyptJournal Article20190828The experiments were carried out in the experimental Farm of Sakha Agricultural Research Station, Kafr El – Sheikh Government during two successive seasons, 2013/14 and 2014/15. Four wheat cultivars namely, Giza168, Sakha94, Masr2 and Gemmiza11 were obtained from Agriculture Research Station. To study the effect of, the different wheat varieties on the population density and average number of the main aphid species.The obtained results showed that, the highest average number of the bird cherry– oat aphid<em>, Rhopalosiphum padi </em>Linnaeus<em>,</em> was recorded on Gemmiza11variety during the two successive seasons, and represented by 183.6 ± 69.8 and 139.4 ± 54indiv. respectively. The results indicated that, the highest average number of the green cereal – bugaphid,<em> Schizaphis graminum Rondani, </em>and was recorded on Gemmiza11variety during the two successive seasons, and represented by 109.2 ± 38.9 and 108.3 ± 34.1indiv respectively. Whereas, the highest average number of the English grain aphid<em>, Sitobion avenea </em>Fabricius.was recorded on Gemmiza11variety during the two successive seasons, and represented by 147.4 ± 39.2 and 113.1 ± 41.7indiv.respectively. Statistical analysis revealed significant differences among wheat varieties during the two seasons of study.https://jppp.journals.ekb.eg/article_46151_8a73421921a0a3be0734e0ff53651f47.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Influence of Nitrogen and Potassium Fertilization Levels on the Population Density of the Bird Cherry – Oat Aphid, Rhopalosiphum padi Linnaeus (Homoptera: Aphididae).87894615310.21608/jppp.2017.46153ENS. S.AwadallaEconomic Entomology Department, Faculty of Agriculture, Mansoura University, Mansoura, EgyptS. B.BelehField Crop Insect Pest Department, Plant Protection Research Institute, Agricultural Research Center, Sakha, EgyptMohsena R. K.MansourField Crop Insect Pest Department, Plant Protection Research Institute, Agricultural Research Center, Sakha, EgyptJournal Article20190828The experiments were carried out in the experimental farm of Sakha Agricultural Research Station, Kafr El – Sheikh Government during two successive seasons, 2013/14 and 2014/15. This study was carried out to determine the relationship between rates of N and K Fertilization on the average number of the bird cherry – oat aphid, <em>Rhopalosiphum padi</em>attacking wheat. The obtained results showed that, <em>R. padi</em> population increased significantly by increasing the rate of nitrogen fertilizer (Nitrates 33.5%). the average <em>numbers</em> of <em>R. padi</em>on wheat during the twosuccessive seasons .The highest average number of <em>R. padi</em>was recorded on nitrogen rates of 200 Kg with an average of 342.5 ± 95.7 and 236.2 ± 56.9indiv.respectively. While, the lowest average number of aphid was recorded on nitrogen rates of 0 Kg with an average of 259.4 ± 79.4and 179.7 ±47.6indiv. respectively. Statistical analysis during the twoseasons indicated significant differences between the aphids' and N rates on wheat. The results indicated that increasing potassium fertilization level from 25 to 75 Kg /fed. Caused a significantly decreasing in the average number of <em>R. padi</em> during the first season while the second season was in significantly. the highest average number of <em>R. padi</em>was recorded on the first level of potassium fertilization with an average number of 213.2 ± 64.7 and 170.8 ± 52.1indiv.respectively.While, the lowest average number of aphid was recorded on the four level of potassium with an average of 154.1 ± 48.3 and 123.1 ± 36.8indiv.respectively.https://jppp.journals.ekb.eg/article_46153_c612e279cc368562b4e39acd196d1f0b.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Studies on the Soft Scale Insect Kilifia acuminata (Signoret) (Hemiptera: Coccidae) is a Main Insect Pest Attacking Mango Trees.91934615710.21608/jppp.2017.46157ENS. S.AwadallaEconomic Entomology Department, Faculty Agriculture, Mansoura University.E. S.El-ZahiPlant Protection Research Institute, Agriculture Research Center.M. A.Abdel-FattahPlant Protection Research Institute, Agriculture Research Center.Journal Article20190828The soft scale insect <em>kilifia acuminata</em> (Signoret) (Hemiptera: Coccidae) is one of the main insect pests infesting mango trees and caused the damage for leaves and fruits. The population density of the soft scale insect <em>k. acuminata </em>during the first year of study 2014/15 recorded 6 peaks and the highest peak was 1539 indiv.on 27<sup>th</sup> of March, 2015. While recorded 5 peaks during the second year 2015/16 and the highest peak was on 17<sup>th</sup> of June 2016 and represented by 1178 indiv. The highest average number and percentage in the first year was recorded during autumn season and represented by 1023.1 indiv. /100 leave (30.2%), while the highest average number and percentage was recorded during spring and represented by 994.8indiv./100 leaves (29%) in the second year. The highest average number of the soft scale insect <em>K. acuminata </em>were recorded in the south direction during the two successive years 2014/15 and 2015/16 and represented by 225.9<span style="text-decoration: underline;">+</span>19.6 and 241.4<span style="text-decoration: underline;">+</span>18.3 indiv. /100 leaves, respectively. On the other hand, the lowest average number were recorded in the North direction and represented by 105.4<span style="text-decoration: underline;">+</span>16.1 and 74.8<span style="text-decoration: underline;">+</span>6.2 indiv. /100 leaves, respectively. Statistical analysis showed that, a highly significant differences between the different directions, during the two successive year of study.https://jppp.journals.ekb.eg/article_46157_da08aa05ef864ed58ce4c7d9a53644d2.pdfMansoura University, Faculty of AgricultureJournal of Plant Protection and Pathology2090-36778220170201Biological Studies on Aphid Species Infesting Citrus Varieties95994615910.21608/jppp.2017.46159ENB. M.EldafrawyDepart. of Economic Ent. and Agric. Zool. , Fac. of Agric ., Menoufia University, Menoufia Governorate, EgyptJournal Article20190828The biological aspects of two aphid species<em>, Aphis gossypii, </em>and<em> Aphis craccivora</em> reared on three citrus varieties (<em>Citrus sinensis, C. reticulate, C. aurantifolia</em>) were studied under green house conditions of the Faculty of Agriculture, Menoufia University. The obtained results showed that the biological aspects were varied among the three citrus varieties. The longest generation period for both aphid species under study were 14.21 days as overall average for <em>Aphis gossypii</em> and 16.86 days for <em>Aphis craccivora</em> on lime seedlings , whereas the shortest generation period was recorded on Navel orange as 10.25 and 10.58 days for <em>A. gossypii, A. craccivora</em> , respectively. The longest parturition period for <em>A. gossypii</em> were 13.58 days as overall average on mandarin and was 10.72 days for <em>A. craccivora</em> on navel orange , whereas the shortest parturition period was recorded on lime as 9.88 for <em>A. gossypii, </em>and 9.18 days for <em>A. craccivora</em> on lime seedlings. The longest averages of life cycle was recorded for <em>A. gossypii</em> on mandarin as 26.11 days , and it was 27.0 days for <em>A. craccivora</em> on lime , whereas the shortest life cycle was recorded on navel orange as 23.66 days for <em>A. gossypii, </em>and 9.18 days for <em>A. craccivora</em> on the same variety. As for the adult longevity , the longest period was 17.45 days for <em>A. gossypii</em> females on navel orange, and was 15.05 days as overall average for <em>A. craccivora</em> on mandarin , whereas the shortest adult longevity period was recorded on lime as 14.5 and 13.7 days for <em>A. gossypii, </em>and <em>A. craccivora</em> on lime seedlings. It could be concluded that navel orange was more preferable host for the two aphid species compared with the other citrus varieties.https://jppp.journals.ekb.eg/article_46159_9a1dea51ef9e78ed0da74715f7c03fd5.pdf