Population dynamics, insecticide resistance and management of onion thrips, Thrips tabaci Lindeman, in southwestern Ontario
Notice bibliographique
Résumé
Onion thrips (OT), 'Thrips tabaci' Lindeman, is a serious pest of onion. In recent years, Ontario onion growers have experienced economic losses and severe control problems due to this pest. In 2000, this project was initiated to create a comprehensive OT-management program for growers. In order to develop such a program, a better understanding of OT biology, the effectiveness of currently available control agents and the potential of replacement control tactics was required. Based on monitoring research, adult OT were captured on white sticky traps placed in commercial onion fields in Thedford-Grand Bend Marsh as early as mid-May in 2001, 2002 and 2003. However, OT were not recorded on plants in the monitored fields until late June to early July. Pole trap monitoring revealed that the majority of OT fly within 0.5 m of the plant canopy. However, thrips were captured on traps as high as 4.95 m above the canopy. Ontario growers are concerned about the efficacy of recommended insecticides. In 2001, six of eight field-collected OT populations were resistant to lambda-cyhalothrin, five were resistant to deltamethrin and three of four were resistant to diazinon. In 2002, nine of 12 field-collected populations were resistant to deltamethrin and seven of 11 populations were resistant to diazinon. In 2003, 15 of 16 field-collected populations were resistant to both lambda-cyhalothrin and deltamethrin while six populations were resistant to diazinon. Laboratory experiments revealed that thiamethoxam, imidacloprid, fipronil and spinosad were effective alternatives. Foliar trials in both commercial onion and research fields revealed that spinosad, acephate, novaluron and pyriproxifen significantly reduced OT populations. Field trials revealed that imidacloprid as a seed-, planting-water- or tray-drench treatment delayed the development of OT populations. Onion thrips tend to congregate deep within the axils of onion leaves making delivery of control agents difficult. Track and field sprayer trials revealed that the TeeJet® XR8004 flat fan nozzle provided the best coverage of inner onion leaves. Coupling treatments with Sylgard ® 309, an organo-silicone non-ionic surfactant, at 200 L/ha significantly increased inner onion leaf coverage. The use of non-ionic surfactants Agral ® 90 or LI-700® also increased coverage of inner onion leaves.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
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 ».