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A survey of Quetta, Pashin and Ziarat, Balochistan, Pakistan was undertaken in April 2006 and tree dieback incidence in these areas was recorded. In Quetta the most affected angiospermic tree species was ash [Fraxinus xanthoxyloides (G. Don) DC] showing about 20% dieback incidence. Trees of all ages were found victim of the disease. However, older trees were found more susceptible to dieback than the younger. The other highly affected tree species was Morus alba showing about 10% dieback incidence. The lowest disease incidence of about 1% was recorded in Robinia pseudoacacia L. Some root infecting fungi may be the cause of dieback in these tree species. Among the gymnosperms, Afghan pine (Pinus eldarica Medw) exhibited about 10% dieback incidence. An unidentified aphid species is response for dieback in this pine. In Pashin, the most fertile district of the Balochistan, dieback incidence was almost zero. Generally apple is cultivated in the area and because of management practices, plants were healthy. In Ziarat Juniper (Juniperus excelsa M.B.) forests were severely suffering from dieback where about 20% trees were showing the disease symptoms. Drought, mistletoe Arcethobium oxycedri and fungus Pyrofomes demidoffii (Lev.) Katl. & Pouz are among the causes of juniper dieback in Ziarat.
Arshad Javaid, Asad Shabir and Salik Nawaz Khan. (2006) PRELIMINARY REPORT ON TREE DIEBACK IN BALOCHISTAN , , Volume 3, Issue 4.
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