WG5 Plant-disease complex interactions

I O RWG5 Plant-disease complexinteractionsAn interpretation of the wordcomplex in low-input systemsScott Phillips and Martin Wolfe (UK)

I O RINDUSTRIALISED AGRICULTURALSYSTEMS - monocultures characterisedby a lack of abiotic and biotic diversity

I O RLOW INPUT SYSTEMS -characterised by abioticand biotic diversityWeedy Winter Wheat

I O R‘Ecological Interactions’• Plant-Plant• Plant-Pathogen• Plant-Plant-Pathogen• Pathogen-PathogenMildew colonies and resistancereactions on organic Triticale

I O R‘Epidemiological interactions’:• Sowing date/rate• Nutrient availability• Variety choice and heterogeneous crops• Rotation design• Field geometry

I O R‘Evolutionary interactions’:• Understanding ofpathogen populationdynamics and genetics• Plant BreedingComposite cross population inan organic system

I O RAll these factors interact, especiallyin heterogeneous cropsEVOLUTIONARYCONSIDERATIONSDISEASEECOLOGYDISEASEEPIDEMIOLOGY

I O ROrganic systems posespecific disease risks –seed borne diseases

I O RWG5 - Disease complex interactions:• What are the important interactions and howdeal with complex interactions?• How deal with seed borne diseases?• How can we make cropping diversityfunctional for numerous biotic and abioticinteractions – can these be synergistic?