Cover crops for plant protection : Cover crops for control of root pathogenic Plasmodiophora brassicae and the root parasitic nematodes Pratylenchus penetransand Meloidogyne hapla
Root pathogens and parasites are an increasing problem in agricultural and horticultural production. The soil borne pathogen Plasmodiophora brassicae is one of the major pathogens in oilseed rape production and the plant parasitic nematodes (PPNs), Pratylenchus penetrans and Meloidogyne hapla inf...
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| Formato: | H2 |
| Lenguaje: | Inglés sueco |
| Publicado: |
SLU/Dept. of Plant Breeding (from 130101)
2022
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| Materias: |
| Sumario: | Root pathogens and parasites are an increasing problem in agricultural and horticultural
production. The soil borne pathogen Plasmodiophora brassicae is one of the major pathogens
in oilseed rape production and the plant parasitic nematodes (PPNs), Pratylenchus penetrans
and Meloidogyne hapla infest important crops such as carrot, potato and strawberry. In
common, both of the nematodes and Plasmodiophora brassicae strongly depend on host
plants for reproduction, and are difficult to control. There is a need for clever integration of
multi-tactic strategies to prevent their dissemination. In the present study, cover crops were
examined in bioassays for their potential to decrease the population density of both
nematodes and infection level of Plasmodiophora brassicae. The examined cover crops in
the Plasmodiophora brassicae trial Lolium perenne and Lupinus angustifolius, revealed
medium high disease severity indices (DSIs) on the indicator plant Brassica napus. However,
no significant decrease was found in comparison to plant free soil (fallow). In the PPN trials,
the cover crop species Avena strigosa and Lupinus angustifolius were investigated. Promising
results were obtained for A. strigosa indicating high resistance to M. hapla and very efficient
suppression of Pratylenchus penetrans in infested soil. Lupinus angustifolius was found to be
susceptible to M. hapla and to be a poor host species for Pratylenchus penetrans. Potentially
A. strigosa could be recommended in crop rotation where both nematode species are
challenging the production of susceptible cultivars. Lupinus angustifolius should be avoided
in crop rotation where M. hapla is present but may be used in crop rotation where
Pratylenchus penetrans is present to prevent excessive multiplication. Further studies are
needed to determine the potential of Lupinus angustifolius, as contradictory results have been
reported from experiments with different varieties of the cover crop. |
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