Ecological Studies on Some Insect Pests Infesting Rosemary Plants and Their Associated Predators at Abo-Kabir District Sharkia Governorate

Abstract

The present studies were carried out to survey and evaluate the population densities of some insect pests infesting rosemary plants and their associated predators during the two successive seasons of 2013 and 2014 at Abo-Kabir district , Sharkia Governorate. The obtained results are summarized as follow : Seven insect species belonging to seven families and four orders were recorded as insect pests on rosemary plants. Bemisia tabaci (Genn.), Aphis gossypii Glover, Empoasca decipiens (Paoli) and Thrips tabaci Lind. were the most dominant species and recorded 53.95, 19.01, 13.08 and 8.14 % of the total insects numbers, respectively.Bemesia tabaci showed four peaks on 1 st August , 22 nd August , 19 th September and 17 th October in the first season and on 24 th July , 21 st August , 2 nd October and 20 th November in the second one. A.gossypii had two peaks on 1 st August and 29 th August in the first season and three peaks on 7 th August , 4 th September and 25 th September in the second season .Temperature and relative humidity influenced B.tabaci populations by 4.4337 and 72.9724 % in the first and second seasons , respectively. Temperature and relative humidity affected A. gossypii population by 33.91 and 44.68 % during the two successive seasons , respectively .Five predaceous insect species belonging to five families and four orders were surveyed. Paederus alfierii (Koch), Coccinella undecimpunctata L. and Chrysoperla carnea (Steph.) were the most dominant species inhabiting rosemary plants and representing 52.12, 24.00 and 10.35% of the total number of predators, respectively.

Survey of Main Insect Species Associated With Certain Medicinal and Aromatic Plants at Awlad-Sakr District, Sharkia Governorate

“…Also, beneficial insects such as, predators, parasitoids, pollinators and visitors can play an important role that affecting productivity of these plants (Ali et al, 2009). A number of investigators have surveyed the http:/www.journals.zu.edu.eg/journalDisplay.aspx?Journalld=1&queryType=Master insects existing on different medicinal and aromatic plants in Egypt (Ramadan, 1998;Ahmad, 1990;Ali, 1998;Hammad and Mohsen, 2000;Ismail, 2001;Abd El-Megid, 2007;Abd El-Moneim et al, 2011;Ismail et al, 2016). Therefore, the current study aims to survey the insect species associated with roselle, thyme and sweet basil plants such as insect pests, natural enemies, pollinators and visitors.…”