An investigation was carried out in Nova Scotia and New Brunswick, Canada, to identify natural regulatory factors, such as soil acidity and weed incidence, that could influence the occurrence of blueberry maggot (Rhagoletis mendax) populations in commercial lowbush blueberry fields (Vaccinium angustifolium). Over the range observed, the soil acidity had no detectable influence on the distribution and mortality of R. mendax larvae and pupae. Adult migrational patterns were affected by the cultural practice of burning on alternate years causing the emerging adults of burned fields to move toward sareasin production. There was also a positive correlation between the growth intensity of indigenous weeds and blueberry maggot infestation levels.

Le charançon de la carotte, Listronotus oregonensis [Coleoptera: Curculionidae], est un ravageur important des cultures de légumes dans le nord-est de l'Amérique du Nord. Cette espèce n'avait cependant jamais été détectée auparavant dans les Maritimes ou à Terre-Neuve. En 1985, 1986 et 1988, des tentatives de détection de ce ravageur en Nouvelle-Ecosse ont été infructueuses. En 1992, des pièges thigmotactiques faits de plaquettes de bois et appâtés avec des carottes fraîches, ont été utilisés dans trois champs de carottes (Daucus carota), et six spécimens ont été capturés durant la migration printanière de l'insecte entre ses sites d'hivernation et un champ de carottes situé près de Great Village, en Nouvelle-Ecosse.The carrot weevil, Listronotus oregonensis [Coleoptera: Curculionidae], is a significant pest of vegetable crops in northeastern North America. However, the species had not been previously detected in Atlantic Canada. In 1985,1986, and 1988, attempts to detect this pest in Nova Scotia were unsuccessful. In 1992, in one of three carrot (Daucus carota) fields monitored using thigmotactic wooden-plate traps baited with fresh carrots, six individuals were captured during the spring migration of the inseetfrom overwintering sites into a carrot field near Great Village, Nova Scotia

Even though some aspects of learning and memory are affected in schizophrenia, our results suggest that the posterior cortical pathway remains efficient at modulating the priming effect. This intact ability could be used to guide the elaboration of new rehabilitation programmes.