Abstract Swiss needle cast of Douglas-fir (Pseudotsuga menziesii) is caused by the ascomycete Phaeocryptopus gaeumannii. Symptoms are foliage chlorosis and premature abscission due to occlusion stomata ascocarps pathogen, resulting in impaired gas exchange. Growth losses 20%-50% have been reported for approximately 150 000 ha plantations western Oregon since 1996. In Coast Range New Zealand, winter temperature strongly correlated with pathogen abundance. Models predicting disease severity...

A change in climate is known to affect seasonal timing (phenology) of the life stages poikilothermic organisms whose development depends on temperature. Less understood potential for even greater disruption cycle when a phenology shift exposes photoperiod‐sensitive new day lengths. We present conceptual framework and model investigate ways that photoperiod‐cued diapause can interact with or latitude influence voltinism organisms. Our degree‐day combines detailed spatial data, latitude‐...

A wide variety of organisms use the regular seasonal changes in photoperiod as a cue to align their life cycles with favorable conditions. Yet phenological consequences photoperiodism for exposed new climates are often overlooked. We present conceptual approach and phenology model that maps voltinism (generations per year) degree mismatch can arise when short-day diapause response introduced regions or otherwise climates. Our degree-day-based combines continent-wide spatialized daily climate...

Rapidly detecting and responding to new invasive species the spread of those that are already established is essential for reducing their potential threat food production, economy, environment. We describe a spatial modeling platform integrates mapping phenology climatic suitability in real-time provide timely comprehensive guidance stakeholders needing know both where when insect could potentially invade conterminous United States. The Degree-Days, Risk, Phenological event (DDRP) serves as...

Introduction Decision support models that predict both when and where to expect emerald ash borer (EAB), Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), are needed for the development implementation of effective management strategies against this major invasive pest ( Fraxinus species) in North America other regions such as Europe. We present a spatialized model phenology climatic suitability EAB use Degree-Days, Risk, Phenological event mapping (DDRP) platform, which is an...

Many disease management decision support systems (DSSs) rely, exclusively or in part, on weather inputs to calculate an indicator for hazard. Error the inputs, typically due forecasting, interpolation, estimation from off-site sources, may affect model calculations and recommendations. The extent which errors quality of final outcome depends a number aspects context, including whether consists single dichotomous decision, multi-decision process extending over cropping season(s). Decision...

Developmental parameters of protogyne Calepitrimerus vitis (Nalepa) (Acari: Eriophyidae) were determined at 12, 15, 17, 22, 25, 28, 31, and 34°C to better understand seasonal activity, population growth, ultimately more effectively manage pest mites in wine grapes. Net reproductive rate (Ro) was greater than zero all temperatures with the maximum Ro (9.72) 25°C. The lowest estimated (0.001) occurred 34°C. There a gradual decrease mean generation time (T) as increased from 17 31°C. shortest...

Abstract Phenology of fall dispersal into apple orchards is described for winterform pear psylla, Cacopsylla pyricola Foerster, in located Yakima and Wenatchee, Washington. Psylla both regions first appeared on mid to late September, reaching peak densities October or early November, then decreased numbers a low December. Movement onto began October; counts occurred November There was considerable variation among years phenology leaf psylla entering apple. Leaf delayed cool, wet (1991)...

Boxwood blight caused by Cps is an emerging disease that has had devastating impacts on Buxus spp. in the horticultural sector, landscapes, and native ecosystems. In this study, we produced a process-based climatic suitability model CLIMEX program combined outputs of four different correlative modeling algorithms to generate ensemble model. All models were fit validated using presence record dataset comprised detections across its entire known invaded range. Evaluations performance provided...

From April to October, 100 adult female Neoseiulus fallads (Garman) (plus immatures) were released at point locations in strawberry thereafter disperse and control twospotted spider mite, Tetranychus urlicae Koch. Between 166 250 degree-days (DD10, 3-8 wk), predators dispersed 2.5-13.3 m2/ DD. At release of 10, 50, or females per but with the same total mites, fewest mites most points gave coverage. Multivariate models showed that more dense older planting, slower spread initially, overall...

Phenology models of development com earworm, Helicoverpa zea (Boddie), and processing sweet corn, Zea mays L. (‘Jubilee’) were combined to predict pest infestation economic loss in western Oregon. Cohorts earworm larvae feeding on newly silking corn artificial diet monitored the field. Degree-days for larval (threshold = 12.5°C) 185 ± 54 (SD) represented model by varying degree-day totals six subpopulations. Oviposition moths closely followed was normally distributed degree-days....

The Internet enables collaboration and information sharing on an unprecedented scale. It has become a prime medium for research extension communication. World Wide Web (WWW) makes it possible to combine from many different sites in seamless fashion. potential using the web integrate all types of static interactive (dynamic) is unique unprecedented. provides excellent interfaces kinds network databases, online analyses data processing. Web-based models decision support systems (DSS) are...

Journal Article Pearl Millet Injury by Five Grasshopper Species (Orthoptera: Acrididae) in Mali Get access Leonard B. Coop, Coop Department of Entomology, Oregon State University, 2046 Cordley Hall, Corvallis, OR 97331-2907 Search for other works this author on: Oxford Academic PubMed Google Scholar Brian A. Croft Economic Volume 86, Issue 3, 1 June 1993, Pages 891–898, https://doi.org/10.1093/jee/86.3.891 Published: 01 1993 history Received: 21 July 1992 Accepted: 14 January

Corn earworm, Helicoverpa zea (Boddie), male catch in pheromone traps was monitored western Oregon processing sweet corn, Zea mays L., fields during 1986-1990. Peaks catches of males and degree-day calculations indicate only two generations per year. Using nominal values for the crop, treatment costs, estimated loss $16.63/ha 10% infestation, an economic injury level at 27.4% infested ears. Correlation regression were used to identify variables predicting percentage ears on a per-field basis...

Early-fall densities of winterform pear psylla, Cacopsylla pyricola Foerster, were higher on 'D' Anjou' than 'Bartlett' and in the upper tree canopy lower canopy. These varietal height effects not consistent over duration fall sampling period; early differences between varieties or heights psylla declined, disappeared, reversed by late fall. We suggest that leaf displaced from upon which relocated within orchard. Five observations support this hypothesis include: (1) water pan traps caught...

Abstract Rapidly detecting and responding to new invasive species the spread of those that are already established is essential for reducing their potential threat food production, economy, environment. We describe a multi-species spatial modeling platform integrates mapping phenology climatic suitability in real-time provide timely comprehensive guidance stakeholders needing know both where when insect could potentially invade conterminous United States. The Degree-Days, Risk, Phenological...

STEMRUST_G, a simulation model for epidemics of stem rust in perennial ryegrass grown to maturity as seed crop, was validated use heuristic tool and decision aid disease management with fungicides. Multistage validation had been used creation by incorporating previously submodels infection, latent period duration, sporulation, fungicide effects, plant growth. Validation the complete comparison output observed severities 35 at nine location-years Pacific Northwest United States. We judge...

Variegated cutworm (VC), Peridroma saucia (Hübner), parasitism rates in western Oregon and peppermint leaf consumption of parasitized unparasitized larvae were measured for use a VC economic threshold model. Instars 4–6 consumed an average 184 cm2, equivalent to 888 mg (dry weight) foliage. Total by Meteorus communis (Cresson) was reduced 93%. averaged 35.1% instars 2–4 5.4% instar 5. Parasitism related time season inversely the log larval host density. M. contributed 11% total parasitism,...

<title>Abstract</title> Boxwood blight is a highly invasive emerging disease. Since the first US report in North Carolina and Connecticut 2011, boxwood has spread to over 30 states, risking more than 90% of production. A infection risk model was developed from limited studies controlled environments. Our study investigated disease field epidemiology validated model’s prediction, using leaf wetness estimated by sensor or algorithms, analysing weekly monitoring data collected on detector...