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Heather Smith Thomas looks at Luing cattle 32
Volume 43 · number 05 february 21, 2017 · $4.25 Practical production tips for the prairie farmer www.grainews.ca
By Lisa Guenther
Disease management
T
MORE RESISTANCE COMING SOON
photo: Lone Buchwaldt, AAFC
Researchers are identifying lines with more-robust sclerotinia resistance
B:7.5” T:7” S:5.875”
here’s good news on the horizon for growers and agronomists wrestling with sclerotinia in canola. Researchers with Agriculture and Agri-Food Canada (AAFC) have identified several canola lines with more-robust resistance to sclerotinia. They’ve also learned more about the sclerotinia pathogen and the sclerotinia resistance genes found in some canola lines. Researchers screened nearly 500 Brassica napus germplasm lines from around the world and found about 30 lines with partial resistance to sclerotinia, says Lone Buchwaldt, plant pathology researcher with AAFC. The most resistant germplasm originated from Pakistan, South Korea and Japan, she adds. Four of these lines are now available to all canola breeders to cross into hybrids. Buchwaldt describes Pioneer’s line as the first generation of sclerotinia resistance, with low partial resistance. “But the materials from AAFC, I believe, will become the second generation with higher partial resistance.” So just how good are these new lines? Researchers evaluate sclerotinia resistance using a stem test, which mimics the natural sclerotinia infection in canola. After plants are infected, researchers measure lesion length and evaluate stem collapse. The most-resistant new lines have stem lesions less than 20 mm (3/4”) long. Stem collapse is under 10 per cent. In susceptible lines, researchers find lesions longer See disease on Page 5
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