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The Surprising Bunts and Smuts “Still a Threat After All These Years”

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The Surprising Bunts and Smuts “Still a Threat After All These Years” The Surprising Bunts and Smuts “Still a threat after all these years” James G. Menzies, AAFC, Winnipeg Manitoba Denis Gaudet, AAFC, Lethbridge, Alberta Bunt and Smut Pathogens of Barley, Oats and Wheat Smut Fungi Basidiomycetes Ustilaginales Tilletiaceae 35 species Important Species on the Prairie Provinces Ustilago spp. – Smut diseases Tilletia spp. – Bunt diseases 2 Wheat Diseases • Seedling Infecting Diseases • Common Bunt • (Tilletia laevis, T. tritici) • Dwarf Bunt (T. controversa) • Karnal Bunt (T. indica) • Flag Smut (Urocystis agropyri) • Floral or Embryo Infecting Disease • Loose Smut (Ustilago tritici) 3 Barley Diseases • Seedling Infecting Diseases • Covered Smut (U. hordei) False Loose Smut (U. nigra) • Floral or Embryo Infecting Disease • Loose Smut (Ustilago nuda) 4 Oat Diseases • Seedling Infecting Diseases • Covered Smut (U. kolleri) Loose Smut (U. avenae) 5 Worldwide Distribution of Common Bunt and Loose Smut Wilcoxson and Saari, eds. 1996. Bunt and Smut Diseases of Wheat: Concepts and Methods of Disease Management. Mexico, D.F.: CIMMYT 6 Life (Disease) Cycles of Seedling Infecting and Floral or Embryo Infecting Smut Fungi Bailey, Gossen, Gugel and Morrall. 2003. Diseases of Field Crops in Canada. The Canadian Phytopathological Society. 7 Conditions Affecting Loose Smut • Favouring Development – Cool moist weather during flowering (95% RH, 20-25oC) – Conditions that extend the flowering of the host (more time to infect). • Detrimental to Development – Excessive heat and dry weather during flowering – Adverse environmental conditions during host development may affect disease expression (i.e. low temperature). – Fusarium graminearum 8 Conditions Affecting Common Bunt • Favouring Development – Soil temperatures between 5 to 10oC – Infection can occur with soil moisture between permanent wilting point and field capacity – optimum in the middle. – Deep seeding – as soil depth increases, the soil temperature becomes more favourable for the pathogen. • Detrimental to Development – Warm soil temperatures (infection is low at 22oC) – Other soil factors are not critical to disease development. 9 Occurrence of Loose Smut of Wheat in Manitoba and Saskatchewan 80 hexaploid wheat durum wheat 70 60 50 40 Percent incidence Percent 30 20 10 0 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Year 10 Occurrence of Loose Smut of Barley in Manitoba and Saskatchewan 90 80 6 Row 2 Row 70 60 50 40 Percent incidence Percent 30 20 10 0 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Year 11 Percentage Infection in Most Affected Fields – Manitoba and Saskatchewan 12 10 hexaploid wheat durum wheat 8 6 percent highestpercent infection 4 2 0 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 ye ar 12 Percentage Infection in Most Affected Fields – Manitoba and Saskatchewan 30 25 6 row 2 Row 20 15 Percent highest infectionPercent 10 5 0 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Year 13 Symptoms of Loose Smut • Smutted Spikes • Narrow lines of sori on the flag leaf – More common in barley • Reduced tillers • After heading, smutted plants may stop growing Symptoms may not be readily visible at harvest. 14 Symptoms of Common Bunt • May not be apparent until after heading • Immature infected spikes are darker green and remain green longer. • Mature spikes are slightly lighter in colour with a slight bluish grey colour compared to healthy spikes. • Florets may be slightly flared, but have a near normal appearance. 15 • Common Bunt and Loose Smut have not been a problem since the middle of the 20th century because of effective control practices, including the use of seed treatment fungicides and host resistance. Significant losses can still occur in individual fields or over small areas, largely as a result of improper application of control techniques or complacency. 16 Disease Management • Many of the techniques used to control Loose Smut and Common Bunt are similar. • Use Resistant Varieties when available. 17 Resistance of Barley Varieties Listed in Seed Manitoba Malting Feed Hulless Barley Barley Barley (26) (25) (4) Resistance Loose Very Good 4 2 3 Smut Good 0 0 0 Fair 5 2 0 Poor 9 17 1 Very Poor 8 4 0 Seedling Very Good 4 10 1 Infecting Good 11 8 2 Smuts Fair 7 5 1 Poor 3 2 0 Very Poor 1 0 0 18 Resistance of Oat Varieties Listed in Seed Manitoba Oats Hulless (17) Oats (6) Resistance Seedling Very Good 13 5 Infecting Good 0 0 Smuts Fair 1 0 Poor 2 0 Very Poor 0 0 19 Resistance of Wheat Varieties Listed in Seed Manitoba CWRS CPS CPS CWES CWHWS (R) (W) (35) (6) (1) (5) (2) Resistance Loose Very 6 1 5 Smut Good Good 14 Fair 8 2 Poor 7 4 2 Very Poor Bunt Very 17 4 1 1 Good Good 1 1 Fair 13 2 4 Poor 4 1 Very Poor 20 Resistance of Wheat Varieties Listed in Seed Manitoba CWSWSCWGP CWADCWWW (2) (2) (10) (2) Resistance Loose Very Smut Good Good Fair 1 Poor 2 1 8 Very Poor 2 Bunt Very 2 10 Good Good 1 Fair Poor 1 1 Very Poor 1 21 Long Term Natural Infection Experiments 6 5 4 3 Percent Infection2 1 0 Years 1992 1994 1996 1998 2000 Year 2002 2004 Very Poor Poor to Fair 2006 Good 22 Disease Management • Seed Treatment Fungicides – Highly effective • Systemic fungicides are necessary for loose smut of wheat and barley • Contact or protectant seed treatments are effective for bunts and the seedling infecting smuts - Placement is often at the point of infection – Number on the market • Fungicide resistance – carboxin resistance has been identified for the loose smut fungi • Fungicide rotations should be practiced. Different modes of action of the fungicides needs to be stressed. 23 Disease Management • Disease Free Seed – Certified Seed – Embryo Test (Loose Smut) • Bunts – Crop Rotation – Bunt spores can survive for 2 years – Seed into warm soils, early fall or late spring • Seed shallow (4 cm instead of 7 cm) 24 Disease Management • Hot Water Treatments – 1) Immerse seed in water at 54oC for ½ hour, then cool immediately. –2) 20oC water for 5 hours; 49oC for 1 minute; 52oC for 11 minutes; cool water immediately – Need to increase your seeding rate. Le Chaulage Soak seed in a copper pannier in a mixture of sheep’s urine and milk of lime (portlandite or calcium hydroxide) 25 Conclusions • The smut and bunt diseases of small grain cereals were once diseases of large impact to agriculture • These diseases are not major problems today because of modern agricultural practices; in particular, the use of resistant varieties and seed treatment fungicides. • Although these pathogens are of minor importance in modern agriculture, they can be commonly found in western Canada, albeit at low severities. • Smut and bunt diseases can still cause losses as a result of improper control practices or complacency. 26 Thank you! 27 .
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