Yellow sticky card traps were assessed as a tool for estimating absolute densities of adult Diaphorina citri Kuwayama (Hemiptera: Psyllidae) in citrus. Weekly trapping was conducted in young and mature trees with traps deployed directly in trees, one trap per tree. In addition, a comparison was made between one and three traps per tree in the mature trees. Solar radiation was positively correla...

Hylobius warreni Wood, also known as the Warren root collar weevil, is a flightless insect that feeds on conifers throughout the boreal forests of Canada. Mature trees typically can withstand feeding, but larval feeding around the root collar may cause mortality to young trees. Recently, a large outbreak of mountain pine beetle (Dendroctonus ponderosae Hopkins) has killed a high proportion of m...

The efficient aquisition of nutrients from leaves by insect herbivores increases their nutrient assimilation rates and overall fitness. Caterpillars of the gypsy moth (Lymantria dispar L.) have high protein assimilation efficiencies (PAE) from the immature leaves of trees such as red oak (Quercus rubra) and sugar maple (Acer saccharum) (71–81%) but significantly lower PAE from their mature leav...

Densities of an herbivorous pest may be impacted by landscape and orchard architecture. We present two orchard experiments where the densities of the Asian citrus psyllid (Diaphorina citri) were compared depending on: (1) the presence or absence of a windbreak and (2) if the orchards consisted of a solid set re-planting or an orchard with a mixture of mature and reset-replacement trees. Psyllid...

Management strategies for old growth pine forests have recently begun to include prescribed burns. Fire could influence interactions between bark beetles and mature pine trees, but we cannot predict the effects because we know too little about the numeric and functional responses of bark beetle populations to fire, and because we do not know how fire affects the oleoresin defense system of pine...

This research aims to combine two different data sets with Bayesian statistics in order to predict the diameter distribution of trees at harvest. The parameters of prior distribution are derived from the forest management plans supplemented by additional ocular information. We derive the parameters for the sample data from the first trees harvested, and then create the posterior distribution wi...

Given the time scale based on duration of exposure to global warming, natural climate-gradient studies and experimental manipulations have detected long-term (decades centuries) short-term (years decades) ecological responses warming. Combination these two complementary approaches within a single study may enable prediction likely processes To understand how warming affects plant–herbivore inte...