دراسة تأثير خصائص التربة في حشرة فيلوكسيرا العنب الجذرية (Phylloxera vitifolia Fitch)‎ في بعض بساتين العنب التجارية في منطقتي مصاد ورساس في محافظة السويداء سورية

الملخص EN

The study was carried out during 2015, in order to evaluate the effect of soil properties in Grape Roots Phylloxera Phylloxera vitifoliae in commercial Grape fields in Al-Suwieda Governorate / Syria (Massad and Rhasas) grafted on B41 and Ruggeri 140 rootstocks.

The study showed that phylloxera vitifoliae caused significant damage to the grape vine planted in a soil with high content of clay, negative correlation between the percentage of organic matter and the average population density, and a positive correlation with the death rate for different stages of the insect in two study sites were found.

A negative correlation between soil pH and the severity of the infection were found, the pH levels ranged between 5-7.8 within study sites.

Tumors number raised with increasing of caly and humus in the soil.

There were a negative effect of sand and carbonate content in the infection severity.

The infection severity closely linked to the availability of nutrients, particularly phosphorus, potassium, magnesium, copper and zinc, the study showed that the decrease or increase in the amount of potassium, magnesium, especially at the lower soil layers increases the severity of the insect.