Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Relationships between disease reactions under controlled conditions and severity of wheat bacterial streak in the field.

Abstract

The relationships between Xanthomonas campestris pv. translucens [X. translucens pv. translucens] (bacterial streak) reactions on primary leaves of seedlings or flag leaves of adult plants and disease severity on adult plants in the field were determined. Fifty spring wheats and 24 winter wheats were tested. Reactions (ranks) of greenhouse-grown cultivars were significantly and positively related (r=0.60-0.64, P≤0.0012) to ranks of cultivars evaluated for disease severity (except for spring wheat cultivar reactions on primary leaves). Selection for low percentages of water-soaking under controlled conditions would mean that some field-susceptible wheats would be kept and some field-resistant wheats would be discarded. It is concluded that inoculation under controlled conditions is not a reliable means of screening a random sample of wheats for X. t. pv. translucens resistance.