1,721,262 research outputs found
Invasion of a Virulent Phytophthora infestans Genotype at the Landscape Level; Does Spatial Heterogeneity Matter?
No full textProper landscape-scale deployment of disease resistant genotypes of agricultural crop species could make those crops less vulnerable to invasion by resistance breaking genotypes. Here we develop a multi-scale, spatiotemporal model of the potato late blight pathosystem to investigate spatial strategies for the deployment of host resistance. This model comprises a landscape generator, a potato late blight model, and a suite of aerobiological models, including an atmospheric dispersion model. Within individual growing regions, increasing the number of host genotypes caused the greatest reduction in epidemic extent, followed by reduction of the proportion of potato in the landscape, lowering the clustering of host fields, and reducing the size of host fields. Deployment of host resistance in genotype mixtures had a large effect on disease invasion. The use of space as an isolation barrier was effective in scenarios involving two distinct potato growing regions. It was possible to completely eliminate the risk of epidemic spread from one region to another using inter-regional separation distances ranging from 8 to 32 km. The overall efficacy of this strategy was highly dependent, however, on the degree of spatial mixing of potato genotypes within each region. Deployment of host resistance in genotype mixtures in both regions served to reduce the overall level of incidence in the landscape and the inter-regional separation distance required to eliminate relevant levels of between-region spread of diseas
Effect of light quality on movement of Pterostichus melanarius (Coleoptera: Carabidae)
No full textThe aim of this project was to study the effect of red light on night time behaviour of Pterostichus melanarius (Coleoptera: Carabidae). An experiment was conducted in experimental arenas in the autumn of 2008. Beetles were recorded 20 min per hour during a period of 8 hours under red light, near infrared radiation and white light.
This study is published in:
Allema, A.B., Rossing, W.A.H., van der Werf, W., Heusinkveld, B.G., Bukovinszky, T., Steingröver, E., van Lenteren, J.C. 2012. Effect of ligth quality on movement of Pterostichus melanarius (Coleoptera: Carabidae) Journal of Applied Entomology. 136, 793-800, http:dx.doi.org/10.1111/j.1439-0418.2012.01728.x
Allema, B., Rossing, W., Werf, W. van der, Heusinkveld, B., Bukovinszky, T., Steingröver, E., Lenteren, J. van
Effect of light quallity on movement In: Quantifying and simulating movement of the predator carabid beetle Pterostichus melanarius in arable land / Allema, B., . - [S.l.] : [s.n.], 2014 - ISBN 9789061739100 (thesis Wageningen University) http://edepot.wur.nl/30186
Simulation of damage in winter wheat caused by the grain aphid Sitobion avenae. 3. Calculation of damage at various attainable yield levels.
No full textVoorkómen is beter
No full textPreventie is het codewoord in de plantgezondheid: hoe kunnen we ziektes vóór zijn, hoe kunnen we voorkomen dat het gewas wordt belaagd? Aanpassing van de omgeving van de plant is één manier: zorgen dat de barrières om bij de plant te komen, hoog zijn. Ook ín de plant kunnen we barricades opwerpen, door resistente planten te selecteren en te veredelen. Verder kunnen we met voorbehandeling van het zaad de plant een goede start geven en wapenen tegen indringers. En dan hebben we tegenwoordig ook nog apps die alarm slaan zodra de omstandigheden bevorderlijk zijn voor ziekteverwekkers
Simulation of damage in winter wheat caused by the grain aphid Sitobion avenae. 2. Construction and evaluation of a simulation model.
No full textA decision model for chemical control of aphids in winter wheat with quantification of risk.
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