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- Managing Plant Disease Risk in Diversified Cropping Systems

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Table 1. Disease risks associated with various crop rotations in the northern Great Plains (Anonymous, 1994; Krupinsky et al., 1997b; McMullen and Lamey, 1999).


Rotation


More risk of


Less risk of

Canola, barley, barley, flax, durum, wheat Leaf spots (cereals) Blackleg (canola)
  FHB{dagger}, scab (cereals) Sclerotinia (canola)
  Common root rot (cereals)  
  Take-all (cereals)  
Wheat, canola–flax, oat–barley, field pea–flax FHB (cereals) Ascochyta (pea)
  Flax wilt Leaf spots (cereals)
  Sclerotinia (pea, canola, flax) Root rots (cereals)
Wheat, pea, oat–barley, canola–sunflower Sclerotinia (pea, canola, sunflower) Blackleg (canola)
  FHB (cereals)  
Wheat, pea, winter wheat, canola–sunflower Sclerotinia (canola, pea) None
  Leaf spots (cereals)  
  FHB (cereals)  
Canola, lentil–pea, wheat Ascochyta (lentil) Most diseases
  Sclerotinia (canola, pea, lentil)  
  Blackleg (canola)  
Canola, lentil–pea, flax, cereal, canola, forage, forage, forage, cereal, cereal Leaf spots (cereals) Blackleg (canola)
  Common root rot (cereals, grasses) Ascochyta (pea, lentil)




Sclerotinia (canola, lentil, pea)

{dagger} FHB, fusarium head blight.

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Table 2. Internet resources for additional information on plant diseases (verified 7 Dec. 2001).

  Managing Disease:  
  Canadian Phytopathological Society: http://res.agr.ca/lond/pmrc/cps/cpshome.html  
  American Phytopathological Society: http://www.apsnet.org/  
  Alberta Agriculture, Food and Rural Development's "Ropin' the Web": http://www.agric.gov.ab.ca/  
  Saskatchewan Agriculture and Food: http://www.agr.gov.sk.ca  
  Manitoba Agriculture: http://www.gov.mb.ca/agriculture/crops/diseases/index.html  
  Minnesota Association of Wheat Growers, Small Grains: The Internet Source For Small Grain Growers: http://www.smallgrains.org/  
  Disease Forecasting:
 
  North Dakota Wheat Leaf Diseases and Fusarium Head Blight: http://www.ag.ndsu.edu/cropdisease/  
  Sclerotinia Risk Forecast Maps: http://www.canola-council.org/ or http://www.gov.mb.ca/agriculture/news/ace/sclerotinia/sclerotinia.html  
  Manitoba Fusarium Head Blight Risk: http://www.gov.mb.ca/agriculture/crops/diseases/index.html  
  Pulse Crops. Agriculture and Agri-Food Canada: http://paridss.usask.ca/specialcrop/pulse_diseases/  
  Fusarium Head Blight:  
  Fusarium head blight in Canada: http://www.cgc.ca/Pubs/fusarium/fusarium-e2.htm  
  U.S. Wheat and Barley Scab Initiative: http://www.scabusa.org  
  USDA Cereal Research Lab: http://www.crl.umn.edu/scab/scab.html  
  North Dakota State's Crop Disease Forecasting Models: http://www.ag.ndsu.nodak.edu/cropdisease/  


ACE-Manitoba Agriculture's Forecast Map: http://www.gov.mb.ca/agriculture/crops/diseases/index.html




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