Production of Disease-free Seed for the Management of Downy Mildew (Sclerospora graminicola) in Pearl Millet uri icon

abstract

  • Frequent occurrences of downy mildew (Sclerospora graminicola) of pearlmillet (Pennlscrtrm glaucum) causc substantial losses in grain yield. Sincc thedisease i s seed transmissible, diseased seed i s considered as one of the factorscontributing to these epidemics. Production of disease-free seed, therefore,requires special attention, Seed production should be carried out in fields withlitlle or no oospores. Seed of a cultivar should not be multiplied in a given fieldfor more than two cansccutive years. This can best be achieved by multiplying seed in rotation of selected cultivars. This practice will reduce the developmentof host-specific populalions of the pathogen. Secd should be treatedwith metalaxyl to control infection by externally seed-carried oospores.A seed crop should be planted with pre sowing irrigation and the field shouldnot be irrigated for 12-13 days afur pliinting. This will control developmentof an early epidemic in the seed crops. Effective roguing of infected plantsthould be practiced from seedling to heading stage. Cultivars with fast seedlinggrowth should be developed. This trait will help in producing seed freefrom internal mycelium which could reach the seed from the infected plant,A combination of all these operations will help to produce disease.free seed,

publication date

  • 1990