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العنوان
Studies on Some Scale Insects and Mealybugs Infesting Mango Trees in Qena Governorate /
الناشر
Moustafa Mohamed Sabry Bakry,
المؤلف
Bakry, Moustafa Mohamed Sabry,
هيئة الاعداد
باحث / Moustafa Mohamed Sabry Bakry
مشرف / Mohamed Samir Fouad
مشرف / Faissal F. Ahmed
مشرف / Saber Fahim Mahmoud Moussa
الموضوع
Agricultural crops - Diseases. Agricultural pest. Insects . Insects - Diseases. Agricultural crops - Diseases. Agricultural pest. Insects . Insects - Diseases.
تاريخ النشر
2009 .
عدد الصفحات
204 p. :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
علوم النبات
تاريخ الإجازة
1/1/2009
مكان الإجازة
جامعة المنيا - كلية الزراعة - Plant Protection
الفهرس
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Abstract

The present investigation was carried out to follow up the population fluctuations of five Coccoidea species infested mango trees at Esna district, Qena Governorate, A.R. of Egypt during the period -#102;-#114;-#111;-#109; 2004 to 2007. Four different scale insects species and one mealybug species infested mango trees were surveyed during 2004/2005 season. These species are Insulaspis pallidula (Green), Aonidiella aurantii (Mask.), Kilifia acuminata (Sign.), Pulvinaria psidii (Mask.) and mealybugs of Icerya seychellarum (Westwood). Six species of parasitoids and six species of predators were associated with scale insects on mango leaves were also surveyed. br The Maskell scale insect, Insulaspis pallidula, had four generations, which were recorded in May, July, October and December in the two years of investigation. The California red scale insect, Aonidiella aurantii had four generations (April, June, October and December) in the two years of investigation. The Acuminata scale, Kilifia acuminata had two generations in June and November in the two years of investigation. The Seychelles fluted scale, Icerya seychellarum had three generations in May, August and October in the two years of investigation. br The grafted Balady mango variety was the most infested variety with the two scale insects (A. aurantii and I. pallidula) followed by Hindy, then by Goleck, while the least infested variety was seedy Balady variety. This means that seedy Balady was less preferable variety for those scale insects. br The population of A. aurantii (Mask.) was higher than that of I. pallidula (Green) on grafted Balady mango variety. Present study confirmed that leaf areas of the infested mango leaves were smaller and contained less plant pigments (chlorophyll a, b) and carotenoids than those of the un-infested mango leaves in all testes varieties. br The quality and quantity of fruits in the infested mango trees was lower than those -#102;-#114;-#111;-#109; the un-infested ones. br The loss in the yield produced by any variety is a summation of the joint action of many factors including insect infestation and the defense mechanism of the variety to regenerate and tolerate this infestation. In conclusion, susceptibility or tolerance of different varieties does not depend on the level of infestation, however, must be depended on the ability of the variety to tolerate the infestation. br The scale insects significantly reduced mango yield by 26-33%. The early season infestation was more effective, causing the greatest loss in mango yield. The reduction in mango yield was a combined effect of insect infestation and the ability of variety to tolerate this infestation. Seed Balady was the least preference variety by scale insects, however exhibiting the highest loss in the yield. br The mineral oil was the least effective treatment in controlling I. pallidula and I. seychellarum. Duplicating the concentration of mineral oil did not significantly enhance its performance. The synthetic insecticides (Admiral and Challenger) and the bio-control agents (Bioranza and Biover) were effective in controlling scale insects.