Effect of the aphid rose Macrosiphum rosae (Hemiptera : Aphididae)‎ infesting rose on physiological and natural characteristics of rose oil as well as population dynamics of this pest

الملخص EN

The aphid rose Macrosiphum rosae L.

(Hemiptera : Aphididae) is stunts the growth of rose and reducing its market value.

The aim of this reasrch work is to study the population fluctuations of the aphid M.

rosae during successive season 2018 on three varieties (colors) of rose and the effect of insect infestation by M.

rosae on the physiological and natural characteristics of rose oil .

The results indicated that the activity period for adults and nymphs of aphid rose infested the varities Carmen, Golden gate and Dream were 23.5 adults/flower and 45.5 nymphs/flower; 25.6 adults/flower and 50.7 nymphs/flower and 20.5 adults/flower and 40.5 nymphs/flower on the mid of April, respectively.

Also, this study was carried out to study effect of infested rose plants by M.

rosae (in different stages of infestation) on the physiological and natural characteristics of rose oil at El-Orman Garden (Giza Governorate) under glasshouse conditions during successive seasons 2018.

Data obtained showed that the most important components of rose oil such as (geraniol, citronellol, nerol, stearpoten, phenyl ethanol and bioflavonoids), acids such as Citric acid and Malik acid and vitamins A, B, C and D were changed its concentrations as result of infestation by M.

rosae.

High infestation by M.

rosae affected on concentrations of these components more than medium and low infestation compared to control.

Also, data obtained showed that the most natural characteristics of rose oil such as volatility, light rotation and refraction value were changed as result of infestation by M.

rosae, but other natural characteristics like freezing point did not change after infestation by M.

rosae.