Evaluation of Resistance, Hydrated Lime, and Weed Control to Manage Clubroot in Canola
Notice bibliographique
Résumé
Plasmodiophora brassicae Wor. is a soilborne parasite causing clubroot of canola (Brassica napus L.), a serious disease managed mostly by planting clubroot resistant (CR) cultivars. Recently, new pathotypes of P. brassicae have emerged that overcome resistance, highlighting the need for a greater understanding of resistance stewardship and an integrated approach to clubroot management. Replicated field experiments were conducted in Edmonton, AB, in 2018 and 2019, to evaluate the effect of lime application and weed management on clubroot severity, crop yield and various growth parameters in clubroot susceptible (CS) and CR canola cultivars. P. brassicae resting spore densities were also monitored by quantitative PCR for each treatment. When hydrated lime was applied to increase the soil pH from initial values of 5.2-5.5 to 7.2, clubroot severity decreased by 34-36% in the CS canola cultivar, while seed yield increased by 70-98%. On CR canola, clubroot severity was reduced by an average of 9% but yield was not significantly affected. The application of hydrated lime also decreased resting spore densities by 48-80%, relative to untreated controls, in plots where the CS cultivar was grown, while the lime application or management of weeds did not significantly affect spore densities in plots with the CR cultivar. While the management of weeds did increase seed yield by an average of 35% in the CR canola and 21-40% in the CS canola, this likely reflected reduced competition rather than a direct effect on P. brassicae spore levels or clubroot severity. The field trials were complemented by a greenhouse experiment in which CS and CR canola cultivars were grown in different combinations (CR/CR, CR/CS, CS/CR, CS/CS) in a canola-wheat-barley-canola rotation with different initial spore densities of P. brassicae (0, 1 x 102, 1 x 104, 1 x 106, 1 x 108 spores per g soil mix). Clubroot severity increased in CR canola when it was grown twice in the rotation, but only when the initial spore concentrations were 1 x 106 or 1 x 108 spores/g soil mix. The results from the field trial suggest that the application of hydrated lime may be a useful strategy to manage clubroot, when used in combination with genetic resistance to reduce disease pressure. The greenhouse experiment suggested that there is a reduced risk of resistance erosion when a CR cultivar is deployed in mildly infested soils with a 2-year break, but this must be confirmed under field conditions. Ultimately, a combination of strategies will be required for sustainable clubroot management.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».