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Effect of cropping pattern and green manure on the antagonistic potential and the diversity of egg pathogenic fungi in fields with Heterodera schachtii infection

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The potential of egg pathogenic fungi in soil from two different sites infested with Heterodera schachtii was measured with a new method in pot experiments. The potential proved to be much greater in the rotation field (sugar beet-wheat) than in the monoculture field (mangold). The green manuring with three different intercrops reduced the potential in soil from the rotation field and promoted it in the monoculture field. Investigation on the diversity of egg pathogens in the two fields showed that the monoculture field had a greater diversity than the rotation field. A large fungal diversity is thought to act as a buffer against microbial changes. This is probably a reason why green manuring in the monoculture field did not reduce this fungal diversity as markedly as in the rotation field and why it did not reduce the potential of egg pathogenic fungi in the same field.

Effets du type de rotation et d'engrais vert sur le potentiel antagoniste etla diversite des champignons pathogenes des oeufs du nematode a kyste de la betterave Heterodera schachtii - Le potentiel antagoniste de champignons pathogenes des oeufs dans le sol de deux champs differents infestes par Heterodera schachtii a ete evalue a l'aide d'une nouvelle methode lors d'une experimentation en pots. Ce potentiel est apparu plus important dans la rotation (betterave a sucre-ble) que dans la monoculture (betterave fourragere). L'apport d'engrais vert a l'occasion de trois cultures intercalaires a diminue le potentiel dans le sol sous rotation et l'a accru en monoculture. L'etude de la diversite des champignons pathogenes d'oeufs dans les deux champs a montre une plus grande diversite en monoculture que sous rotation. Une large diversite des champignons est consideree comme un tampon vis-a-vis des changements bacteriens. Ceci explique probablement pourquoi l'apport d'engrais vert en monoculture n'a pas reduit cette diversite fongique autant que dans la rotation et pourquoi cet apport n'a pas diminue le potentiel des champignons pathogenes d'oeufs dans le meme champ.


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