Defoliation by the European gypsy moth (Lymantria dispar L.) and subsequent tree mortality have been well documented in the northeastern United States. In this study we evaluate tree mortality after initial defoliation in mixed pine-hardwood stands in the southeastern United States as the range of European gypsy moth expands. In 1993, 46 mature pine-oak and pine-sweetgum stands were selected on...

Distinctive plant growth and development have been associated with resistance to defoliation by herbivores. Descriptions of resistance (tolerance/avoidance) strategies are common, although little is known about genetic variation affecting their expression in natural plant communities. This research compared response to three frequencies of defoliation in populations of Bouteloua curtipendula va...

blast disease of rice caused by pyricularia oryzae is a potentially damaging disease in northern due to planting of susceptible local cultivars and favorable conditions. to assess the effects of blast on rice yield components and yield loss, one field experiment was conducted at the lowland culture conditions. analysis of blast effects on rice indicated that the maximum yield losses due to unpr...

Sward structure affects herbage growth, pasture species dynamics, and herbage utilization. Defoliation management has a major impact on sward structure. In particular, tiller size-tiller density compensations allow for the maintenance of herbage growth. Tiller size and tiller density are determined by several major morphogenetical components. Defoliation affects these morphogenetical components...

This research tested the long-term effects of defoliation on aspen chemistry and growth in relation to genotype and nutrient availability. We grew saplings of four aspen genotypes in a common garden under two conditions of nutrient availability, and subsequently subjected them to two levels of artificial defoliation. Artificial defoliation suppressed plant growth, and saplings of the four genot...

Abstract The nettle caterpillar, Setothosea asigna , is a major pest in an oil palm plantation North Sumatra, which causes severe defoliation and reduces productivity. Controlling this commonly uses Pyrethroids insecticides, but dimehypo was also used when controlling bagworms caterpillars the exact location. sublethal doses were reported to decrease mortality. study aimed determine effect of o...

In May 2007, a widespread frost event defoliated much of Utah's high elevation aspen. About 5 weeks later, the frost-defoliated aspen produced a second leaf flush. The objective of this study was to characterize changes in leaf morphology and function in re-flush leaves following frost defoliation. Leaf size and thickness, photosynthesis, carbohydrate and nutrient status, and defense chemistry ...

Insect defoliation is a major disturbance force in forbetween 1987 and 1993, but single date NIR in each year was negatively correlated with budworm levels in 1993 ested ecosystems. Monitoring outbreaks, and estimating (r520.69 and 20.47). This was because hardwood trees the areas affected, is therefore important for both forest within jack pine stands caused higher NIR reflectance managers and...

Bud-burst and leaf-senescence determine the length of growing season for deciduous trees therefore duration potential carbon assimilation with consequences on biomass production. In Fagus sylvatica L., leaf phenology depends both photoperiod temperature. The future climate is expected to induce more frequent soil water deficits biotic attacks (possibly resulting in severe defoliation). aim stud...