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Life tables of the Mealy bug Phenacoccus solenopsis Tinsley1898 (Hemiptera: Pseudococcidae) on Hibiscus mutabilis ( Malvaceae) in Iraq

Author: Dr. FAYHAA ABBOOD MAHDI Al-NADAWI
Journal: journal of the college of basic education مجلة كلية التربية الاساسية ISSN: 18157467(print) 27068536(online) Year: 2018 Volume: 24 Issue: 100 / علمي Pages: 35-46
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

density is in May. It reveals that the primate mortality factors play a key part in the pest population density, these life table expose that the eggs infertility give rise to mortality rate, then the photoperiodism and sex ratio, play the main role in the hesitation of the high pest density .The limited effect by biotic factors is on the larvae stages. though , the significance of these vital and not vital factors in the population density regularity, below the economic threshold level, with carry on the trend index, to high values in the highest levels direction up to 1.7-1.34, on the cotton rose Hibiscus mutabilis ( Malvaceae). The results showed that the photoperiodism and the adult mortality were the responsible factors in decreasing the high insect density . And the trend index during the interval from March to August 2016, was 1.07, 1.03, 0.93, 0.88,0.30 and 1.34, in Baghdad respectively. so, it has become meaningful to decrease the insect,s natural enemies of from original regions necessary for pest management and decrease the widespread of the high insect density.

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