THE CHANGES IN POPULATION DENSITY OF APHIDS ATTACKING SOME MEDICINAL AND AROMATIC PLANTS IN EGYPT

Document Type : Original Article

Authors

1 Faculty of Agriculture, Al-Azhar University, Cairo, Egypt

2 Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt

Abstract

 In recent years, cultivation of the medicinal and aromatic plants in sothern Egypt has noticeably increased. These plants are infested with several pests, of which aphids are considered to be the most seri‌ous pests and caused serious reduction in the annual yield. The aim of the present study is to survey aphids infestation on Fennel, Foeniculum vulgare L., Valerian, Valeriana officinalis, Nigella, Nigel-la sativa L and roselle, Hibiscus sabdariffa plants. Also, seasonal variations of temperature and humidity on aphids fluctuations were also studied. The results revealed that the previous plants were infested during vegetative stage with aphids; valerian and nigella plants with Myzus persicae Sulzer, while Fennel and Roselle plants with Brevicoryne brassicae L. and Aphis gossypii Glover, respectively. Fennel plants were also attacked during the flowering and fruiting stage by Hyadaphis coriandri Das. Statistical analysis showed that temperature had negative effect on the population density of M.persicae and A.gossypii, while humidity had a positive effect. On the other hand, temperature was positively correlated with the population density of H.coriandri and B.brassicae, while relative humidity was negatively correlated. 

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