Insecticidal activity of peels oil of Citrus sinensis and summer oil against two scale insects Aulacaspis tubercularis (Hemiptera: Diaspididae)‎ and Milviscutulus mangiferae (Hemiptera: Coccidae)‎

الملخص EN

Essential oil extracted from peels of balady orange (Citrus sinensis L.) was tested for its insecticidal activity at three different concentrations (1000, 5000 and 10000 ppm) against nymphs, adults and gravid females of white mango scale Aulacaspis tubercularis (Newstead) (Hemiptera: Diaspididae) and mango soft scale Milviscutulus mangiferae (Green) (Hemiptera: Coccidae).

Formulated oil of balady orange was bioassayed against the two scale insects and the results revealed that, the formulated oil of balady orange achieved high toxicity against nymphs, adults and gravid females of both A.

tubercularis and M.

mangiferae at all used concentrations.

Balady orange oil concentrations (0.1, 0.5 and 1%) were more potent against the two scale insects than the reference product (summer oil 1.5%).

The essential oil of balady orange was isolated by hydrodistillation and the analysis of gas chromatography–mass spectrometry (GC/MS) revealed the presence of 12 peaks, approximately all peaks were identified.

The chemical composition showed that limonene was the main constituent in citrus oil (83.28%).

The results of the present study suggested that, formulated balady orange oil used as safe, potential natural products for control of A.

tubercularis and M.

mangiferae on mango trees and may be used as alternatives to the reference products after application of these results in the semifield and field experiments.