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Lygus bugs cause significant losses in commercial crops. Parasitoids (Peristenus) attack Lygus nymphs and have been considered to manage Lygus populations. The thesis provides information on the seasonal activity of three Peristenus species in southern Alberta, and a possible outcome of the European P. digoneutis in terms of Lygus control in canola, if present in the Prairies. Three native Peristenus species (P. braunae, P. carcamoi and P. broadbenti) occur sequentially during the season in southern Alberta. Overall parasitism did not exceed 16% during the season. In greenhouse trials, P. digoneutis parasitized Lygus nymphs on alfalfa and canola. Parasitism was on average up to 19% in alfalfa, and from 10-15% in canola. Nymphs’ mortality was higher in canola than alfalfa, and it increased with the presence of P. digoneutis. The potential of P. digoneutis to attack Lygus in canola can improve the latter’s management in the Prairies.

Lygus bugs cause significant losses in commercial crops. Parasitoids (Peristenus) attack Lygus nymphs and have been considered to manage Lygus populations. The thesis provides information on the seasonal activity of three Peristenus species in southern Alberta, and a possible outcome of the European P. digoneutis in terms of Lygus control in canola, if present in the Prairies. Three native Peristenus species (P. braunae, P. carcamoi and P. broadbenti) occur sequentially during the season in southern Alberta. Overall parasitism did not exceed 16% during the season. In greenhouse trials, P. digoneutis parasitized Lygus nymphs on alfalfa and canola. Parasitism was on average up to 19% in alfalfa, and from 10-15% in canola. Nymphs’ mortality was higher in canola than alfalfa, and it increased with the presence of P. digoneutis. The potential of P. digoneutis to attack Lygus in canola can improve the latter’s management in the Prairies.

Lygus bugs cause significant losses in commercial crops. Parasitoids (Peristenus) attack Lygus nymphs and have been considered to manage Lygus populations. The thesis provides information on the seasonal activity of three Peristenus species in southern Alberta, and a possible outcome of the European P. digoneutis in terms of Lygus control in canola, if present in the Prairies. Three native Peristenus species (P. braunae, P. carcamoi and P. broadbenti) occur sequentially during the season in southern Alberta. Overall parasitism did not exceed 16% during the season. In greenhouse trials, P. digoneutis parasitized Lygus nymphs on alfalfa and canola. Parasitism was on average up to 19% in alfalfa, and from 10-15% in canola. Nymphs’ mortality was higher in canola than alfalfa, and it increased with the presence of P. digoneutis. The potential of P. digoneutis to attack Lygus in canola can improve the latter’s management in the Prairies.

Lygus bugs cause significant losses in commercial crops. Parasitoids (Peristenus) attack Lygus nymphs and have been considered to manage Lygus populations. The thesis provides information on the seasonal activity of three Peristenus species in southern Alberta, and a possible outcome of the European P. digoneutis in terms of Lygus control in canola, if present in the Prairies. Three native Peristenus species (P. braunae, P. carcamoi and P. broadbenti) occur sequentially during the season in southern Alberta. Overall parasitism did not exceed 16% during the season. In greenhouse trials, P. digoneutis parasitized Lygus nymphs on alfalfa and canola. Parasitism was on average up to 19% in alfalfa, and from 10-15% in canola. Nymphs’ mortality was higher in canola than alfalfa, and it increased with the presence of P. digoneutis. The potential of P. digoneutis to attack Lygus in canola can improve the latter’s management in the Prairies.

Lygus bugs cause significant losses in commercial crops. Parasitoids (Peristenus) attack Lygus nymphs and have been considered to manage Lygus populations. The thesis provides information on the seasonal activity of three Peristenus species in southern Alberta, and a possible outcome of the European P. digoneutis in terms of Lygus control in canola, if present in the Prairies. Three native Peristenus species (P. braunae, P. carcamoi and P. broadbenti) occur sequentially during the season in southern Alberta. Overall parasitism did not exceed 16% during the season. In greenhouse trials, P. digoneutis parasitized Lygus nymphs on alfalfa and canola. Parasitism was on average up to 19% in alfalfa, and from 10-15% in canola. Nymphs’ mortality was higher in canola than alfalfa, and it increased with the presence of P. digoneutis. The potential of P. digoneutis to attack Lygus in canola can improve the latter’s management in the Prairies.

Lygus bugs cause significant losses in commercial crops. Parasitoids (Peristenus) attack Lygus nymphs and have been considered to manage Lygus populations. The thesis provides information on the seasonal activity of three Peristenus species in southern Alberta, and a possible outcome of the European P. digoneutis in terms of Lygus control in canola, if present in the Prairies. Three native Peristenus species (P. braunae, P. carcamoi and P. broadbenti) occur sequentially during the season in southern Alberta. Overall parasitism did not exceed 16% during the season. In greenhouse trials, P. digoneutis parasitized Lygus nymphs on alfalfa and canola. Parasitism was on average up to 19% in alfalfa, and from 10-15% in canola. Nymphs’ mortality was higher in canola than alfalfa, and it increased with the presence of P. digoneutis. The potential of P. digoneutis to attack Lygus in canola can improve the latter’s management in the Prairies.

Lygus bugs cause significant losses in commercial crops. Parasitoids (Peristenus) attack Lygus nymphs and have been considered to manage Lygus populations. The thesis provides information on the seasonal activity of three Peristenus species in southern Alberta, and a possible outcome of the European P. digoneutis in terms of Lygus control in canola, if present in the Prairies. Three native Peristenus species (P. braunae, P. carcamoi and P. broadbenti) occur sequentially during the season in southern Alberta. Overall parasitism did not exceed 16% during the season. In greenhouse trials, P. digoneutis parasitized Lygus nymphs on alfalfa and canola. Parasitism was on average up to 19% in alfalfa, and from 10-15% in canola. Nymphs’ mortality was higher in canola than alfalfa, and it increased with the presence of P. digoneutis. The potential of P. digoneutis to attack Lygus in canola can improve the latter’s management in the Prairies.

Lygus bugs cause significant losses in commercial crops. Parasitoids (Peristenus) attack Lygus nymphs and have been considered to manage Lygus populations. The thesis provides information on the seasonal activity of three Peristenus species in southern Alberta, and a possible outcome of the European P. digoneutis in terms of Lygus control in canola, if present in the Prairies. Three native Peristenus species (P. braunae, P. carcamoi and P. broadbenti) occur sequentially during the season in southern Alberta. Overall parasitism did not exceed 16% during the season. In greenhouse trials, P. digoneutis parasitized Lygus nymphs on alfalfa and canola. Parasitism was on average up to 19% in alfalfa, and from 10-15% in canola. Nymphs’ mortality was higher in canola than alfalfa, and it increased with the presence of P. digoneutis. The potential of P. digoneutis to attack Lygus in canola can improve the latter’s management in the Prairies.

Lygus bugs cause significant losses in commercial crops. Parasitoids (Peristenus) attack Lygus nymphs and have been considered to manage Lygus populations. The thesis provides information on the seasonal activity of three Peristenus species in southern Alberta, and a possible outcome of the European P. digoneutis in terms of Lygus control in canola, if present in the Prairies. Three native Peristenus species (P. braunae, P. carcamoi and P. broadbenti) occur sequentially during the season in southern Alberta. Overall parasitism did not exceed 16% during the season. In greenhouse trials, P. digoneutis parasitized Lygus nymphs on alfalfa and canola. Parasitism was on average up to 19% in alfalfa, and from 10-15% in canola. Nymphs’ mortality was higher in canola than alfalfa, and it increased with the presence of P. digoneutis. The potential of P. digoneutis to attack Lygus in canola can improve the latter’s management in the Prairies.

Lygus bugs cause significant losses in commercial crops. Parasitoids (Peristenus) attack Lygus nymphs and have been considered to manage Lygus populations. The thesis provides information on the seasonal activity of three Peristenus species in southern Alberta, and a possible outcome of the European P. digoneutis in terms of Lygus control in canola, if present in the Prairies. Three native Peristenus species (P. braunae, P. carcamoi and P. broadbenti) occur sequentially during the season in southern Alberta. Overall parasitism did not exceed 16% during the season. In greenhouse trials, P. digoneutis parasitized Lygus nymphs on alfalfa and canola. Parasitism was on average up to 19% in alfalfa, and from 10-15% in canola. Nymphs’ mortality was higher in canola than alfalfa, and it increased with the presence of P. digoneutis. The potential of P. digoneutis to attack Lygus in canola can improve the latter’s management in the Prairies.

La production de fraises au Québec correspond à plus du tiers de celle du Canada avec près de 2000 ha cultivés et une production de fruits annuelle d'environ 9000 t. La punaise terne, Lygus lineolaris (Palisot de Beauvois), l'anthonome de la fleur du fraisier, Anthonomus signatus (Say) et le charançon de la racine du fraisier, Otiorhynchus ovatus (Linnaeus), sont les principaux insectes ravageurs des cultures de fraises. Ces insectes peuvent affecter 1'inflorescence, ce qui entraîne une déformation du fruit et une diminution de sa valeur marchande. La punaise terne a développé une résistance à divers pesticides chimiques. Des essais en lutte biologique avec des auxiliaires (prédateurs et parasitoïdes) se sont avérés insatisfaisants. Le champignon entomopathogène Beauveria bassiana (Balsamo) suscite de plus en plus d'intérêt en recherche et constitue une avenue intéressante en lutte biologique contre certains ravageurs. Il n'existe aucune formulation commerciale à base de B. bassiana pour le contrôle des populations de la punaise terne. Par ailleurs, la pathogénicité et la virulence de ce champignon sur l'anthonome de la fleur du fraisier et le charançon de la racine du fraisier n'ont pas encore été étudiées. Cette recherche consiste, dans un premier temps, à déterminer le potentiel insecticide de plusieurs isolats de B. bassiana contre les populations de L. lineolaris, A. signatus et O. ovatus. Les isolats INRS-IP et INRS-CFL avaient un potentiel insecticide intéressant au laboratoire contre les adultes et les nymphes de la punaise terne et les adultes de l'anthonome de la fleur du fraisier et du charançon de la racine du fraisier. Ils ont causé des mortalités supérieures à 80 % au septième jour suivant l'inoculation. Parallèlement aux épreuves biologiques, il est essentiel de caractériser les isolats étudiés avant leur application au champ. La caractérisation des isolats permet de réaliser un suivi environnemental suite à leur emploi au champ. Les isolats de B.bass

Two insects are discussed as pests of beans in Southern Idaho. One of the species, Lygus hesperus Knight, is reported for the first time as a pest of beans. The injury caused is termed "punctured beans";The life history of the two species is discussed. The description of the five nymphal instars and the adult stage is given. The life history of the two species was found to be essentially the same;The injury of these two insects is fully described and photographs of the injury are presented. Methods used for determining the cause of the injury are discussed in detail;Populations of the two insects in alfalfa, clover, and beans are studied and the methods used are described;A brief resume of the history of the two pests is presented;Two parasites, one unidentified, are discussed. The parasites were not present during the entire season;Methods of control are discussed, but no definite recommendations are made;The systematic position of the two insects is stated and a proposal is made to raise them from the rank of varieties to that of species for reasons given;New common names are proposed for each species.

15 p., Includes: line drawings; graphs; tables; 2 p. b/w photographs, 17038117 Historic Organic Production Research Database., Later this year, we will begin redirecting users to these reports on the National Agricultural Library site at https://naldc.nal.usda.gov/organic_roots, Organic Agriculture Information Access, (dlps) 17038117.0004.001, (nal) https://naldc.nal.usda.gov/catalog/CAT86200003, https://www.lib.umich.edu/about-us/policies/copyright-policy, Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. National Agricultural Library call no.: 1 Ag84Te no.4

Guayule Insect Investigations Season 1943