Exotic Xylosandrus spp. ambrosia beetles established in non-native habitats have been associated with sudden and extensive attacks on a diverse range of living trees, but factors driving their shift from dying/dead hosts to living and healthy ones are not well understood. We sought to characterize the role of host physiological condition on preference and colonization by two invaders, Xylosandr...

The tree-killing mountain pine beetle (Dendroctonus ponderosae Hopkins) is an important disturbance agent of western North American forests and recent outbreaks have affected tens of millions of hectares of trees. Most western North American pines (Pinus spp.) are hosts and are successfully attacked by mountain pine beetles whereas a handful of pine species are not suitable hosts and are rarely...

We investigated differences in host infection by a desert mistletoe, Phoradendron californicum, and examined one of the processes that contributes to these differences: variation in seed deposition among host individuals and species. In the Sonoran Desert, P. californicum parasitizes the sympatric leguminous trees Olneya tesota, Cercidium microphyllum, Prosopis elutina, Acacia constricta, and A...

the distribution of phytophthora parsiana a high-temperature tolerant newly described species was studied in southern iran and examined its host range in woody perennial plant species in greenhouse condition under high inoculum potential. among different plant species examined, almonds were highly susceptible by different isolates. from 24 woody plants inoculated, the disease severity in descen...

New Zealand Journal of Ecology (1998) 22(1): 71-85 ©New Zealand Ecological Society Availability of suitably-sized support is a major factor limiting liane access to the canopy because lianes are not self-supporting (Putz and Holbrook, 1991). In the Knysna Forest, South Africa, aspects of forest architecture which affect support availability, rather than abiotic factors such as light levels and ...

When examined at any moment in time, different parts of an individual oak tree exhibit almost as large differences in quality as different trees. But how consistent are such patterns in time? In this paper, we use intraclass correlations to assess the temporal consistency of host plant quality at several spatial scales. As measures of quality, we use both individual chemical attributes (phenoli...

A host may be physically isolated in space and then may correspond to a geographical island, but it may also be separated from its local neighbours by hundreds of millions of years of evolutionary history, and may form in this case an evolutionarily distinct island. We test how this affects the assembly processes of the host's colonizers, this question being until now only invoked at the scale ...

HSIANG, T., and EDMONDS, R. L. 1989. Physiological specialization of Heterobasidion annosum on conifer hosts. Can. J. Bot. 67: 2396-2400. Eight conifer hosts belonging to five conifer species were inoculated in vitro with conidial suspensions of eight isolates of Heterobasidion annosum from Washington and Califomia. The conifer trees were represented in inoculation tests by 1 cm diameter branch...

The destinies of epiphytic orchids (about 70% all orchids) are linked to their host trees. However, there is little information on if differences in trees characteristics can affect the long-term persistence orchid populations, and how this might vary under different climatic conditions. We compared population dynamics two species, Alamania punicea Oncidium brachyandrum growing with contrasting...