An Improved Field Screening Technique for Downy Mildew Resistance in Pearl Millet

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Abstract
An effective, large-scale field screening technique was developed to identify sources of resistance to downy mildew (S. graminicola) in pearl millet (P. americanum). The technique, based on preplanted infector rows that provide sporangial inoculum, was successfully used to identify and improve downy mildew resistance in composites, cultivars and hybrid parents. The major advantages of the technique are: reliability; uniformity of inoculum distribution; flexibility in location and size of screening plots; effectiveness throughout the year (including the dry winter [postrainy] season); and independence from rainfall.

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