Jihan  Al-Abdullah^{* (1)} and Mageda  Mofleh^{( 2)}

(1). Suwayda Research Center, General Commission for Scientific and Agricultural Research, Syria

(2). Plant Protection Research Department, General Commission for Scientific and Agricultural  Research, Damascus, Syria

(*Corresponding author Jihan M. Al-Abdullah.E.MAIL:  Jihan_na@hotmail.com)

Received:8/07/2024                   Accepted:4/11/2024

Abstract: 

The effect of some ground and foliar fertilizer treatments with nitrogen, potassium, and calcium compound were studied on the two species of mites Panonychus ulmi Koch Tetranychus urticae Koch on the Golden delicious and Starking delicious apple varieties in the Dhahr al-Jabal area in As_Suwayda Governorate, between 2019-2021, the results showed that the use of ground fertilizer treatments did not have a significant impact on the population of mites that affect apples, except for the treatment of potash sulfate on the Golden variety, where the population of P. ulmi eggs increased significantly from the rest of the treatments. Foliar treatment with potash fertilizers affected differently the two species of mites, it reduced the population of T. urticae, increased the population of P. ulmi, and the addition of calcium compounds foliar led to an increase in the population of T. urticae. The effect of nitrogen fertilizers had a different effect between the varieties.   The relationship between mites and plant nutrition is complex and varies depending on the species of mites and plant variety, and needs more detailed studies.

Keywords: apples, mites. Tetranychus urticae, Panonychus ulmi, Fertilizer Treatments.

Full paper in Arabic: pdf