Life history, morphology and host choice among populations of blissus leucopterus hirtus montandon (Hemiptera: Blissidae) in Quebec and Atlantic Canada
Notice bibliographique
Résumé
Blissus leucopterus hirtus Montandon (Hemiptera: Blissidae) (hairy chinch bug), is a pest of turfgrass in Quebec and Atlantic Canada that causes considerable damage to turf and lawns. This research investigated the influence of environmental heterogeneity on the phenology, morphology and host preference of B. leucopterus hirtus. Populations of B. leucopterus hirtus in St. John's, NL displayed the lowest threshold for egg development and the highest rate of egg development compared with other regions across the insect's range, indicating environmental influence attributable to shorter and cooler summers in the St. John's region. This adaptation was also reflected in a more compact phenology compared to other regions. Cumulative Degree Days and Julian Days were both effective in predicting the appearance of 2nd instars, a critical milestone for pest managers in conducting appropriately timed pesticide application. -- There was no difference in tertiary sex ratio among sites at a local scale, but there was an greater number of males than females in Fall 2004 and 2005 compared to the sprang, suggesting differential mortality of dispersal. Wing form ratios varied at the local scale and over time, with an increase in brachypters over two years indicating increasingly established populations. Differences in habitat at the local and regional scale were sufficient to produce differences in insect size, with the smallest insect size rankings in St. John's, NL, where egg development rates were also most rapid. -- Differences in host choice among 1st instars of B. leucopterus hirtus were observed at the local and regional level, demonstrating flexibility in host choice among populations. Preference was affected by age of insect, with 1st instars favouring Kentucky bluegrass, while 5th instars were less discriminant. Tendency for aggregation in later instars appeared to influence choice. Based on these results, pest managers should be better able to predict host vegetation based on insect phenology and potentially apply alternative methods of control such a vacuuming when populations are likely to be found on specific host plants as a result of either feeding preference or other behaviour tendencies such as aggregation. -- The results of this thesis confirm the influence of environmental heterogeneity on the phenology, morphology and host preference of B. leucopterus hirtus and the subsequent need for regional specificity in pest management, along with consideration of insect age and populations dynamics in host choice research.
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) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| 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 ».