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Relationship of the quantitative and qualitative volatile oil contents of citrus leaves with infestation of citrus varieties with citrus leaf miner Phyllocnistis citrella Stainton (Lepidoptera,Phyllocnistidae)

 Mogahed M.I.1, N. Nazif2, Kh.A. Abdel Shafeek2 and M.M. El-Missiry2

1-      Pests and Plant Protection Dept., NRC, Dokki, Cairo, Egypt

E-mail: [email protected]     [email protected]

  2- Chemistry of Medicinal Plants Dept.,NRC

ABSTRACT

Screening studies carried out on 7 citrus varieties for their susceptibility to infestation with Phyllocnistis citrella Stainton at Qualiyobiya and North Sinai Governorates, Egypt, highest infested citrus varieties were Lemon, Grapefruits and Saify followed by navel and mandarin. The least infested varieties were sweet and baladi orange. Infestation with P. citrella were seasonally fluctuated. Leaves infestation (%) were larger at Qualiyobiya  than North Sinai.

Odorous constituents such limonene (Terpene hydrocarbon) in lime. Acids and esters of organic acids, in grapefruit making its leaves more attractive to insect than other varieties. It was concluded that total content of volatile oils in citrus leaves were significantly affected by diversity of varieties. Differentiation of citrus infestation with CLM depends on total content of V. oils in citrus leaves and levels of some odorous constituents.  There is a relationship between chemical composition of V.O. and infestation with CLM. Limonene, linalool (T. alcohol) and esters of organic acid in V. oils content increased insect infestation of  lemon, grapefruits, saify and mandarin varieties. An increase of aldehydes and ketones in V. oils content decreased infestation of baladi and navel trees caused with P. citrella.

Key words: Citrus leafminer, Citrus trees, susceptibility to insect infestation, chemical analysis