Occurrence of juniper dwarf mistletoe, Arceuthobium oxycedri (DC.) M.Bieb. In Balochistan province, Pakistan
2004
Sarangzai, A.M.,Balochistan University, Quetta (Pakistan). Botany Dept.
A oxycedri, occurs from central Spain, across southern Europe, NorthAfrica, the Near East, the Himalayas and western China where it infectsJuniperus species and other hosts of the family Cupressaceae. In Pakistan, A.oxycedri is presently known from a single location, the Ziarat Forest,encompassing an area of approximately 3,500 ha, (4%) of the total forest areaof the province. It occurs on much of the upper headwaters of the Chasnakand the Sasnamana valleys of the Ziarat district. In the infested portions ofthe Chasnak Valley, an estimated 31.76% of the host trees are infected with amean area dwarf mistletoe rating (DMR) of 1.53 and an estimated 2.03 % annualmortality rate. Nearly 50% of the infected trees have a DMR of 6. On contrast,an estimated 22% of the trees in the Sasnamana Valley are infested with amean area DMR of 0.52. No recent trees mortality, directly attributable to thisparasite was detected in Sasnamana Valley and nearly 50% of the infectedtrees have a DMR of 1. This parasite was also detected in portions of fouradjoining drainage. It is estimated that these infections have been present forat least 25 to 30 years. In either of the two valleys, the host tree in widelyscattered and there is only a limited potential for tree-to-tree spread. In theassociated areas of these two valleys, the infections occur in relatively well-stocked forests and there is a high potential for tree-to-tree spread.
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