The effect of infection of Arceuthobium oxycedri on Juniperus excels species in North West forests of Iran

One of the most important destruction reasons of Juniperus aged and Long Lived trees in Jaysh Abad sits of Tarom township is a semi-parasitic plant from Dwarf Mistletoes group of viscaceae family. Biological study done in Jaysh Abad area of Tarom Township and other Juniperus sits in Zanjan province of Iran revealed that this semi-parasitic plant is Arceuthobium oxycedri. For determining the infection percent, intensity, quality and quantity on the host species half hectare sample pieces were randomly selected in 4 geographical directions. The results of this study showed that Dwarf Mistletoes mostly influences trees with bigger crown size, crown area, height and diameter breast height. Also result showed that Juniperus trees in south directions are more infected in comparison with other directions.