British Trees and Shrubs, including those commonly planted

Susceptibility of Oregon Forest Trees and Shrubs to Phytophthora ramorum:

Phytophthora ramorum is a recently established invasive pathogen in some mixed-hardwood forests of central coastal California (10,11) and extreme southwestern Oregon (5). It also is known from horticultural nurseries and landscape plantings in Europe (12) and recently was reported from a few nurseries in California and Oregon (6,9). Symptoms are dramatically different on different host species....

When Trees Grow Low: Shrubs and Fast MSO1

Recent characterization [9] of those graphs for which coloured MSO2 model checking is fast raised the interest in the graph invariant called tree-depth. Looking for a similar characterization for (coloured) MSO1, we introduce the notion of shrub-depth of a graph class. To prove that MSO1 model checking is fast for classes of bounded shrub-depth, we show that shrub-depth exactly characterizes th...

Survival and Growth Factors Affecting Community-Planted Urban Street Trees

On the average hyperoscillations of planted plane trees

Assume that the leaves of a planted plane tree are enumerated from left to right by 1, 2, . . . . The j-th s-turn of the tree is defined to be the root of the (unique) subtree of minimal height with leaves j, j + 1, . . ., j + s -1 . If all trees with n nodes are regarded equally likely, the average level number of the j-th s-turn tends to a finite limit a . (j), which is of order j 1/2 . The j...

Assessing the capacity of trees and shrubs species to accumulate of particulate matter (PM10, PM2.5 and PM0.2)

Background and Objective: Today, the presence and increase of particulate matter is one of the serious factors that threaten human health. In the meantime, trees can accumulate airborne particles by their foliage. In this study, the accumulating ability of various PM by the leaf of some tree and shrub species was evaluated in Isfahan. Materials and Methods: 12 species of trees and shrubs were ...