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Data on hosts and geographic distribution of the juniper dwarf mistletoe, Arceuthobium oxycedri, are updated in light of changes in host nomenclature, political geography, and interpretation of reports and labels. Seventeen species of Juniperus, 3 Chamaecyparis, 5 Cupressus, and 1 Platycladus are reported as hosts. Infestations on several juniper hosts and all of its non-juniper hosts have resulted from introductions to areas within the natural range of the mistletoe. This dwarf mistletoe is reported from 31 countries across northern Africa, western Europe, the Balkans, Russia and other former Soviet Republics, the Near East, the Indian subcontinent, and western China. Previous reports from Bhutan and Hungary are corrected, and a report from Afghanistan is considered questionable. Located collection sites are shown on 13 regional and country maps. Juniper dwarf mistletoe is or is potentially an important disease agent in arid forests of numerous countries. Information on its hosts and distribution can help to make good decisions for maintaining forest health and productivity. Authors Acknowledgments

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Juniper dwarf mistletoe, Arceuthobium oxycedri (DC.) M .Bieb, in Balochistan Province, Pakistan by William M. Cieslal, Ghulam ~o h a r n m e d~ and A. Hafeez ~u z d a r~Arceuthobium oxycedri, occurs from central Spain, across Arceuthobium oxycedn se retrouve dans le centre de I'Espagne, southern Europe, North Africa, the Near East, the Himalayas and dans tout le sud de I'Europe, le nod de I'Afrique, au Prmhe-Orient, western China where it infects Juniperus species and other hosts dans les Himalayas et dans I'ouest de la Chine ou il infecte les espttces of the family Cupressaceae. In Pakistan, A. oxycedn is presentJuniper et autres membres de la famille des Cupressacees. Au ly known from a single location, the Ziarat Forest, an 88,000 ha Pakistan, A. oxycedris a ete retrouve dans un seul endroit, la for6t forest ofJ. acelsa in northern Balmhistan Province where it presentde Ziarat, une forst de 88 000 ha de J. excelsa situee dans le nord ly encompasses a more or less contiguous area of approximatede la province de Balochistan ou il affecte presentement une superly 3,500 ha, or about 4% of the total forest area. A. oxycedn occurs ficie plus ou moins contigue de 3 500 ha, soit environ 4% de la over much of the upper headwaters of the Chasnak and the superficie forestiere totale. A. oxycedri est present dans la plupart Sasnamana Valleys of the Ziarat Forest. In the infested portions des hauts versants des vallees de Chasnak et de Sasnamama de of the Chasnak Valley, an estimated 3 1.76% of the host trees are la forst de Ziarat. Dans les zones infestees de la vallee de infected with a mean area dwarf mistletoe rating (DMR) of 1.53Chasnak, une proportion estimee a 3 1.76 % des arbres hates est and an estimated 2.03% annual mortality rate. Nearly 50% of the infectee selon un taux moyen de superficie du faux-gui (DMR) infected trees have a DMR of 6. By contrast, an estimated 22% de 1.53 et on estime le taux de mortalite annuelle a 2.03 %. Pres of the trees in the Sasnamana Valley are infested with a mean area de 50 % des arbres infectes ont un DMR de 6. Par contre, une pro-DMR of 0.52. No recent tree mortality, directly attributable to A, portion estimee a 22 % des arbres de la vallee de Sasnamana est oxycedri, was detected in the Sasnamana Valley and nearly 50% infectee a un taux DMR de 0.52. Aucune mortalite recente, of the infected trees have a DMR of 1. A. oxycedn was also detectdirectement attribuable a A oxycedris a ete detectee dans la valed in portions of four adjoining drainages. It is estimated that these lee de Sasnamana alors que 50 % des arbres infectes avait un taux infestations have been present for at least 25 to 30 years. In two DMR de 1. A oxycedns a ete egalement detecte dans quelques porof the drainages, the host tree is widely scattered and there is only tions des bassins versants contigus. On estime que ces infestations a limited potential for tree-to-tree spread. In the remaining two sont sur place depuis au moins 25 a 30 ans. Sur deux bassins vervalleys, infestations occur in relatively well stock...

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