Population Density of the Main Mealybug Species Attacking Mango Trees and Their Associated Predatory Insects at Mansoura Region

Abstract

The present studies were carried out in the experimental farm belonging to the Faculty of Agriculture, Mansoura University to evaluate the population density of the main mealybug species attacking mango trees (Mangifera indica L.), and their the seasonal activity of the main associated predatory insects. Also the interaction between these insect pests and their associated predatory insects in two successive years 2013/14 and 2014/15. The highest peak of Icerya aegyptiaca was recorded in the first week of November 2013 (67 indiv.) during the first year and in the fourth week of September 2015 (59 indiv.) during the second year. Icerya seychellarum recorded the highest peak in the third week of November 2013 during the first year and in the first week of November 2014 in the second year and represented by 496 and 516 indiv., respectively. While, the highest peak of Planococcus citri was found in the third week of July 2014 (156 indiv.) and in the fourth week of September 2015 (281 indiv.) during the two successive years, respectively. Moreover, the obtained results showed that Macnollicoccus hirsutus had the highest peak in the fourth week of August 2014 (191 indiv.) during the first year and in the second week of August 2015 (227 indiv.) in the second year. The highest peak of Rodolia cardinalis in the first week of November 2013 and represented by 84 and 93 indiv. for the two successive years 2013/14 and 2014/15, respectivel y. Chrysoperla carnea had the highest peak in the second week of August 2014 (37 indiv.) in the first year and in the end of the second year (43 indiv.). While, the highest peak of Nephus includens was found in the second week of August 2014 (22 indiv.) and in the second week of September 2015 (29 indiv.) for the two successive years, respectively. Meanwhile, the highest peak of Scymnus coccivora showed in the second week of August 2014 and 2015 for the two successive years and represented by 29 and 25 indiv., respectively. The highest average number of the main predatory insects were recorded in autumn and summer seasons and were coincided with the highest average number of the mealybug species during the two successive years 2013/14 and 2014/15. A highly positive significant effect were recorded between the highest abundant of the mealybug species as I. seychellarum and P. citri and the highest abundant predatory insects as R. cardinalis and C. carnea during the two successive years.

Population Dynamics of Two Mealybug Species, Ferrisia Virgata Cockerell and Maconellicoccus Hirsutis Green (Pseudococcidae: Homoptera) Associated With Grapevine in Fayoum Governorate- Egypt

“…; M. hirsutus is responsible for serious damage causing withering of plants, crinkling of leaves and deforming buds, shoots and fruits owing to the toxicity of the mealy bug's saliva, however, leaves sometimes are curling and. resetting, similar to characteristic caused by viruses (Almeida et al, 2014;Jones et al, 2015;Awadalla and Ghanim, 2016). In Egypt, the nymphs of M. hirsute were found on leaves and twigs in most months of the year while they were found on twigs only in winter months.…”

Biochemical and Anatomical Characteristics of Some Mango Tree Cultivars Infested by Two Mealybugs, Planococcus Citri (Risso) and Icerya Seychellarum (Westood) in Egypt

“…The purpose of this study focused on how to improve the plant qualities of mango varieties that infected with mealybug insects, and what mango varieties are most tolerant of them? The data clearly show that Fagri Klan is the most infected mango variety, with two mealybugs, I. seychellarum and p. citri followed by Balade, then Zebda cultivar, (Pheophanh and Ki-Jeong 2016) found nine species of scale insects on mango trees in laos, I. seychellarum was among them, also (Hagar et al, 2016) recorded the presence of I. seychellarum and p. citri on mango trees with different population peaks at Mansoura Governorate , Egypt. Otherwise no infestation was found in Ewais and Skare cultivars with I. seychellarum and Alphonso with p. citri mealybug.…”

Seasonal Abundance of Icerya aegyptiaca (Douglas) on Mandarin Trees and its Associated Predators at Giza Governorate

“…Also, the highest peak recorded in the15 th of September during the two successive years of study. Awadalla and Ghanim (2016) mentioned that I. aegyptiaca had 2 peaks November and June in the first year on mango trees in Mansoura district, while, recorded three peaks in November, June and September in the second year. The highest average number of I. aegyptiaca were recorded in Autumn.…”

“…Also, C. carnea on I. aegyptiaca recorded four peaks, in October, June, August and September in the first season and three peaks in October, June and September in the second season. Awadalla and Ghanim (2016) recorded that R. cardinalis had three peaks of abundance, while C. carnea had 2-3 peaks of I. aegyptiaca on Mango trees at Mansoura district in Egypt. R. cardinalis and C. carnea were recorded in autumn with the highest average number of I. aegyptiaca.…”