Canopy defoliation is an important source of disturbance in forest ecosystems that has rarely been represented large-scale manipulation experiments. Scalable crown to canopy level experimental needed disentangle effects variable intensity, timing, and frequency on structure, function, mortality. We present a novel pressure washing-based method can be: implemented at the canopy-scale, throughout...

a r t i c l e i n f o Keywords: Coniferous forest Insect damage mapping Time-series data MODIS NDVI WDRVI Pine sawfly Insect damage is a general problem that disturbs the growth of forests, causing economic losses and affecting carbon sequestration. Coarse-resolution data from satellites are potentially useful for national and regional mapping of forest damage, but the accuracy of these methods...

We examined the effects of fertilization and gypsy moth defoliation of hybrid poplar (Populus ×canadensis Moench ‘Eugenei’) on ectomycorrhizal (ECM) and arbuscular mycorrhizal (AM) fungal colonization, ECM richness, and ECM composition in the summers of 1997 and 1998. The factorial experiment included two levels of defoliation (defoliated and control) and fertilization (100 kg N·ha–1 and contro...

Induced changes in root carbohydrate pools are commonly assumed to determine plant defoliation tolerance to herbivores. However, the regulation and species specificity of these two traits are not well understood. We determined herbivory-induced changes in root carbohydrates and defoliation tolerance in seven different solanaceous plant species and correlated the induced changes in root carbohyd...

Gypsy moth defoliation of oak trees has been shown to lead to increased tannin levels, which, in turn, lead to reduced gypsy moth growth and fecundity. In laboratory experiments, increased tannin levels can interfere with the transmission of a virus that is consumed by larvae on oak foliage, and high mortality rates of larvae in the field are sometimes associated with low levels of defoliation....

Spruce budworm (Choristoneura fumiferana (Clem)) is the main defoliator in boreal forest of North America, and its outbreaks have major ecological economic consequences represent a challenge for management. Numerous studies addressed effects this on mature trees, whereas spruce regeneration remain elusive. Furthermore, intensive exploitation practices during last decades left large area Canadia...

abstract in order to evaluate the effects of drought stress and defoliation on sunflower, a study was conducted under controlled conditions. treatments were a combination of three levels of drought ((100, 60 and 30 percent of field capacity (fc)) and three levels of defoliation (control, removal of either 4 or 6 leaves from lower part of the plant) laid out, in a completely randomized design wi...

Abstract Frequent, severe defoliation reduces grass production and can alter plant species composition in grasslands. Multipaddock rotational grazing has been proposed as a strategy that may reduce the frequency intensity of on palatable plants without altering stocking rates. Previous studies evaluated this hypothesis using small, homogeneous paddocks nonadaptive rotation schedules found small...