Disease aster yellows
The following articles are categorized as 'Disease aster yellows'
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Aster leafhoppers arrive later in 2013
Delayed arrival of southerly winds in 2013, together with the colder start to the growing season, may lessen the risks associated with aster leafhoppers, the insect (shown) that carries aster yellows phytoplasma. However, given that we’re still learning about this disease, it will be difficult to predict disease levels at this stage of the season.
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Aster yellows Q&A
Sclerotinia and blackleg remain the top two most important canola diseases, but aster yellows are a hot topic after a bad year in 2012. The Canola Council of Canada agronomy team came up with the following 10 questions about aster yellows. Chrystel Olivier, research scientist with Agriculture and Agri-Food Canada in Saskatoon, answered them the best she could given what is currently known about the disease.
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Aster yellows and healthy looking plants
Late or mild infections of aster yellows could lead to poor seed set in normal-looking pods. Stress from aster yellows can also sometimes lead to purpling or may aggravate sunscald.
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Lots of aster yellows
Fields all across the Prairies are reporting aster yellows. The phytoplasma infection causes misshapen pods and flower buds. Most fields don’t go above 1% infected plants, however, some fields are reported this year with rates at 5% to 8% of plants infected. A 10% infection rate results in 3% to 7% misshapen seeds or no seeds at all.
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