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Management	
  of	
  Soilborne	
  Diseases	
  for	
  
Sustainable	
  Pulse	
  Crop	
  Produc8on	
  
Weidong	
  Chen	
  
USD...
Soilborne	
  Diseases	
  versus	
  Foliar	
  Diseases	
  
Foliar	
  diseases	
  are	
  usually	
  favored	
  by	
  lush	
 ...
Unique	
  Features	
  of	
  Soilborne	
  Diseases	
  
•  Reside	
  in	
  an	
  opaque	
  matrix	
  
•  Complex	
  habitat:...
Soilborne	
  Diseases	
  
Cool	
  weather	
  diseases	
  
	
  Pythium	
  and	
  Rhizoctonia	
  damping-­‐off	
  
	
  Aphano...
Fusarium	
  wilts	
  
•  Pea	
  -­‐	
  Fusarium	
  oxysporium	
  f.	
  sp.	
  pisi	
  
– Races	
  1,	
  2,	
  5	
  and	
  ...
Vascular	
  discolora8on	
  
Fusarium	
  wilt	
  
Chickpea	
  differen8als	
  	
  
for	
  races	
  of	
  Fusarium	
  wilt	
  
In	
  many	
  parts	
  of	
  the	
  world,	
  Fusarium	
  
wilt	
  could	
  be	
  confounded	
  with	
  root	
  
rot	
  ca...
Fusarium	
  root	
  rot	
  
•  Caused	
  by	
  Fusarium	
  redolens,	
  and	
  F.	
  solani	
  
•  Occurs	
  on	
  pulse	
...
Fusarium	
  Black	
  Root	
  Rot	
  of	
  Len8l	
  
Rhizoctonia	
  root	
  rot	
  
Pythium	
  damping-­‐off	
  caused	
  by	
  metalaxyl-­‐resistant	
  Pythium	
  spp.	
  
No Metalaxyl	

 With Metalaxyl	

Resistant	

Sensitive
New	
  fungicide	
  Intego	
  effec8ve	
  
against	
  metalaxyl-­‐resistant	
  Pythium	
  
Long-­‐term	
  Sustainable	
  approaches	
  to	
  
managing	
  soilborne	
  diseases	
  
•  Use	
  resistant	
  cul8vars	
...
Management  of Soilborne  Diseases for Sustainable Pulse Crop Production
Management  of Soilborne  Diseases for Sustainable Pulse Crop Production
Management  of Soilborne  Diseases for Sustainable Pulse Crop Production
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Management of Soilborne Diseases for Sustainable Pulse Crop Production

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Oral Presentation 37 by Weidong Chen at the International Conference on Pulses in Marrakesh, Morocco, 18-20 April 2016

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Management of Soilborne Diseases for Sustainable Pulse Crop Production

  1. 1. Management  of  Soilborne  Diseases  for   Sustainable  Pulse  Crop  Produc8on   Weidong  Chen   USDA  ARS,  Washington  State  University   Pullman,  WA  99164,  USA   Interna8onal  Conference  on  Pulses   Marrakesh,  Morocco   April  18-­‐20,  2016  
  2. 2. Soilborne  Diseases  versus  Foliar  Diseases   Foliar  diseases  are  usually  favored  by  lush   vegeta8ve  growth.   Soilborne  diseases  are  usually  exacerbated  by   poor  vegeta8ve  growth.  
  3. 3. Unique  Features  of  Soilborne  Diseases   •  Reside  in  an  opaque  matrix   •  Complex  habitat:  Physical,  chemical  and   biological  components   •  Fungicide  applica8ons  usually  ineffec8ve  or   uneconomical   •  Management  prac8ces  well  planned  and   executed  ahead  of  plan8ng  
  4. 4. Soilborne  Diseases   Cool  weather  diseases    Pythium  and  Rhizoctonia  damping-­‐off    Aphanomyces  root  rot     Warm  weather  diseases    Fusarium  wilt    Fusarium  root  rot    Sclero8um  collar  rot    Charchoal  rot  
  5. 5. Fusarium  wilts   •  Pea  -­‐  Fusarium  oxysporium  f.  sp.  pisi   – Races  1,  2,  5  and  6   •  Chickpea  -­‐  Fusarium  oxysporium  f.  sp.  ciceri   – Races  0,  1A,  1B/C,  2,  3,  4,  5  and  6   •  Len8l  -­‐  Fusarium  oxysporium  f.  sp.  len1s   •  Dispersal:  by  means  of  movement  of  soil,   plant  fragments  by  water,  wind,  and  people  
  6. 6. Vascular  discolora8on  
  7. 7. Fusarium  wilt  
  8. 8. Chickpea  differen8als     for  races  of  Fusarium  wilt  
  9. 9. In  many  parts  of  the  world,  Fusarium   wilt  could  be  confounded  with  root   rot  caused  by  Fusraium  redolens.  
  10. 10. Fusarium  root  rot   •  Caused  by  Fusarium  redolens,  and  F.  solani   •  Occurs  on  pulse  crops  throughout  the  world   •  Occurs  usually  on  stressed  plants,  o6en  in  hot,   dry  season.   •  Ini:ally  reddish  brown  discolora:on  of  roots,   then  turn  darker  as  disease  progress   •  Above  ground  symptoms  include  stunted   growth,  yellowing  and  necrosis  of  basal  foliage  
  11. 11. Fusarium  Black  Root  Rot  of  Len8l  
  12. 12. Rhizoctonia  root  rot  
  13. 13. Pythium  damping-­‐off  caused  by  metalaxyl-­‐resistant  Pythium  spp.  
  14. 14. No Metalaxyl With Metalaxyl Resistant Sensitive
  15. 15. New  fungicide  Intego  effec8ve   against  metalaxyl-­‐resistant  Pythium  
  16. 16. Long-­‐term  Sustainable  approaches  to   managing  soilborne  diseases   •  Use  resistant  cul8vars  whenever  possible.   •  Rotate  with  non-­‐legume  (non-­‐host)  crops.   •  Reduced  and  conserva8ve  8llage.   •  Increase  organic  maer,  microbial  biomass,  ac8vity   and  diversity   •  Improve  soil  health  (the  capacity  to  func8on  as  a  vital   living  system  to  sustain  biological  produc8vity,   promote  plant  health).  

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