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Emerging virus and viroid disease risks on greenhouse crops

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This fact sheet offers an overview of emerging virus and viroid diseases that may potentially have serious economic consequences for the greenhouse industry in Alberta.

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Fireblight

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Fireblight, a highly destructive disease of several members of the rose family, is caused by the bacterium Erwinia amylovora. This bacterial organism is native to North America and is present... More ≫

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Fireblight, a highly destructive disease of several members of the rose family, is caused by the bacterium Erwinia amylovora. This bacterial organism is native to North America and is present throughout the continent where susceptible rose family hosts are grown. In Alberta, this disease can affect many highly desirable hardy ornamentals and fruit-producing species in the rose family including apple, crabapple, cotoneaster, hawthorn, pear, mountain ash, raspberry, saskatoon berry, plum and cherry. It is particularly destructive to species that are not native to Canada such as crabapple, apple and pear.

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Understanding bacterial ring rot in potatoes

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Over the past two decades, Alberta has developed an excellent reputation for producing high quality, healthy seed potato stocks. Annual losses from bacterial ring rot (BRR) in our commercial... More ≫

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Over the past two decades, Alberta has developed an excellent reputation for producing high quality, healthy seed potato stocks. Annual losses from bacterial ring rot (BRR) in our commercial potatoes are minimal or non-existent. All seed potatoes in Canada undergo rigorous testing for this highly infectious disease, as required under federal seed regulations. If the disease is found in seed potatoes, current regulations state that all seed lots on that seed farm or farm unit will be decertified in that year.

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Yellows diseases of echinacea, monarda and caraway

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Trends in crop diversification on the Canadian prairies have resulted in the increased production of exotic herbs, spices, essential oils and medicinal plants. With these new specialty crops have... More ≫

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Trends in crop diversification on the Canadian prairies have resulted in the increased production of exotic herbs, spices, essential oils and medicinal plants. With these new specialty crops have come unique disease and pest problems, some of which were previously rare or unknown on the prairies. One example is the so-called "yellows" diseases of echinacea, monarda and caraway. Recognizing the symptoms of these diseases and understanding the basic biology of the infectious agents that cause them is fundamental to developing an effective pest management program. But first, it helps to know a bit about the origins of these crops and what they should look like in a healthy condition.

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Wheat streak mosaic in Alberta and its control

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The information in this fact sheet was prepared five decades ago by Dr. J.T. Slykhuis and Dr. J.E. Andrews at the Agriculture Canada, Lethbridge Research Station. With a few minor revisions, all... More ≫

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The information in this fact sheet was prepared five decades ago by Dr. J.T. Slykhuis and Dr. J.E. Andrews at the Agriculture Canada, Lethbridge Research Station. With a few minor revisions, all their virus control information is as valid now as it was then. Wheat streak mosaic, which is probably native to southern Alberta, was first recognized here in 1952. In both 1952 and 1953, wheat streak mosaic caused severe damage to a number of winter and spring wheat crops. It did so again on winter and spring wheats in 1992 in the Claresholm to Mossleigh area. This disease can be controlled or reduced to a minimum by following certain cultural and agronomic practices. The following information is provided to answer some of the questions being asked by farmers about wheat streak mosaic and to suggest methods for its control.

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