Jan Philip Øyen

ImpACT of nematodes in Carrots

ImpACT aims to tackle an increasing challenge in carrot production namely plant parasitic nematode (PPNs) that are emerging as problematic in todayʼs intensive cropping practices. Norwegian carrot production has doubled in the last 20 years and impressively covers 94% of the market. Carrot production practices face different biotic challenges,carrots for storage struggle with storage diseases, whereas fresh produce suffer directly from PPNs and other pests. Plant parasitic nematodes are neglected due to unspecific crop symptoms and the cryptic nature of nematodes that urgently needs attention. ImpACT of nematodes aims to map the extent of nematode occurrence and damage incarrot production through surveys and questionnaires, and provide advice on management options filling the gap indealing with nematodes. Soil steaming is a tool to knock down nematode populations. We aim to evaluate this technology and assess the long-term effects on soil health. Biochar, organic fertilisers, and bio stimulants are possible tools for combatting nematodes, however there is lack of evidence, certainly under Nordic conditions. ImpACT will evaluate soil amendments under controlled conditions and test the best bet in field trials. Furthermore, to understand interactions between nematodes in the soil and their host plant(s), studies in the rhizosphere will be conducted to elucidate the mode of infection/attraction/repellence to plant roots, in the long-term leading to novel management options. In field-based observations we will investigate the cause of storage damage on carrots, suspected to be initiated by nematodes. To generate much needed knowledge on this neglected pest of carrots our applied and basic research will create new insights on tools for nematode management as well as nematode-host interactions that can be developed further into sustainable management strategies.