Juliana J. Soroka

Investigating the host plant range of Contarinia nasturtii (Diptera: Cecidomyiidae), reveals novel hosts and lack of host plant resistance within a Brassica napus diversity panel

Carina Lopez, Juliana J. Soroka, Sally Vail, Meghan A. Vankosky et autres

Swede midge, Contarinia nasturtii Kieffer (Diptera: Cecidomyiidae), is an invasive pest of canola (Brassica napus Linnaeus, Brassica juncea Linnaeus, Brassica rapa Linnaeus) and other Brassicaceae crops that causes significant damage in eastern North America. Contarinia nasturtii has the potential to invade the …

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Flea beetle (Phyllotreta spp.) management in spring‐planted canola (Brassica napus L.) on the northern Great Plains of North America

Priyanka Mittapelly, Kristen Guelly, Altaf Hussain, Héctor A. Cárcamo et autres

Abstract Canola (Brassica napus L. and B. rapa L. [Brassicales: Brassicaceae]) is a major oilseed crop grown globally as a source of vegetable oil, animal feed and biofuel feedstock. The global demand for canola oil as a biofuel feedstock has increased due …

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Hypera postica(Gyllenhal), Alfalfa Weevil / Charançon postiche de la luzerne (Coleoptera: Curculionidae)

Juliana J. Soroka, Andrew M. R. Bennett, Boyd A. Mori

Hypera postica , the alfalfa weevil, was introduced to North America at least three times, giving rise to three strains of H. postica on the continent. All alfalfa weevil specimens recently collected on the Canadian prairies belonged to the western strain. The …

Pheromone trap monitoring reveals the continued absence of swede midge in the Northern Great Plains

Meghan A. Vankosky, Shane Hladun, Jonathon L. Williams, Juliana J. Soroka et autres

Abstract The swede midge, Contarinia nasturtii (Kieffer) (Diptera: Cecidomyiidae), is invasive to North America, where it was first reported in Ontario, Canada. It is now established in eastern Canada and from eastern Minnesota in the Midwest to the northeastern seaboard of the …

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Distribution and life history of Contarinia brassicola (Diptera: Cecidomyiidae) in canola ( Brassica napus ) grown on the Canadian Prairies

Meghan A. Vankosky, Shane Hladun, Juliana J. Soroka, Lars Andreassen et autres

Abstract Contarinia brassicola Sinclair (Diptera: Cecidomyiidae) is a recently described species found infesting canola ( Brassica napus L. and Brassica rapa L., Brassicaceae) in western Canada. There is concern that C. brassicola could have economic impacts on canola production. To learn about …

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Vascular occlusion associated with abiotic stress is a causal agent of silvertop in perennial grasses

Juliana J. Soroka, G. L. Lees, B. D. Gossen

Silvertop (sterile heads) of perennial cool-season grasses is common in aging stands grown for seed production. It is associated with yield reduction, but the causal agent(s) has not been determined. A study was conducted to examine the cytology of grass tillers with …

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Dimethoate insecticide application seldom reduces silvertop incidence in grass seed fields on the Canadian prairies

Juliana J. Soroka, B. D. Gossen

Many arthropods have been reported (but none confirmed) as causal agents of sterile seed heads in perennial grass seed fields, known as silvertop or white head. Field studies to identify the arthropods that cause silvertop were conducted in five perennial grass species …

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Silvertop in perennial grass seed production: effects of type and timing of biotic stresses

Juliana J. Soroka, B. D. Gossen

Seed production of perennial grasses is an important industry in Canada, but many fields exhibit high proportions of sterile heads with characteristic symptoms in a condition known as silvertop. In a 3-yr field study, biotic stress treatments were applied to caged plots …

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Relationships among root maggot (Delia spp., Diptera: Anthomyiidae) infestation, root injury, and seed yields of canola Brassica napus L. and Brassica rapa L.

Juliana J. Soroka, R.M. Weiss, Larry Grenkow, O. Olfert

This study investigated the relationships between numbers of Delia species (Delia spp. Rob.-Desv., Diptera: Anthomyiidae) flies or eggs and root injury levels of Brassica napus L. and Brassica rapa L. (Brassicaceae) canola (oilseed rape), and between root injury levels and canola seed …

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Distribution of alfalfa weevil (Coleoptera: Curculionidae) and its parasitoids on the Canadian Prairies, with a key to described species of NearcticBathyplectes(Hymenoptera: Ichneumonidae)

Juliana J. Soroka, Andrew M. R. Bennett, Cezarina Kora, Marla Schwarzfeld

Abstract This study recorded distribution and size of alfalfa weevil (Hypera postica(Gyllenhal); Coleoptera: Curculionidae) populations in Saskatchewan, Canada, from 2001 to 2014. The spread of alfalfa weevil across the province, originally southwest to southeast, was northward and westward during this time. By …

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The Occurrence of Alfalfa Weevil and Its Major Parasitoid Bathyplectes curculionis across Saskatchewan, Canada

Juliana J. Soroka

The alfalfa weevil Hypera postica (Gyllenhal) (Coleoptera: Curculionidae) is one of the most destructive insect pests of alfalfa herbage in North America. Palearctic in origin, the weevil was first found in North America near Salt Lake City, Utah, in 1902 (Titus 1911), …

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The Occurrence of Alfalfa Weevil and Its Major Parasitoid Bathyplectes curculionis across Saskatchewan, Canada

Juliana J. Soroka