Relationships between nitrogen application rate soil nitrate-nitrogen, plant nitrogen concentration and wheat scab Studies on Relationship between Choline Concentration in Flowering Spikes and Resistance to Scab among Bread Wheat Varieties LOSS ASSESSMENT MODELS OF YIELD AND QUALITY CAUSED BY FUSARIUM HEAD BLIGHT FIELD NATURAL IDENTIFICATION OF WHEAT RESISTANCE TO SCAB AND BREEDING FOR SCAB RESISTANCE A STUDY ON STAGE PREDICTION MODELS FOR WHEAT SCAB DISEASE STUDY ON THE YIELD LOSSES CAUSED BY SPRING WHEAT SCAB APPLICATOIN OF THE HIGH-HUMID PERIOD OF WEATHER IN THE QUANTITATIVE FORECASTING OF WHEAT SCAB Continuous spatial distribution models of biological population and their application EPIDEMIOLOGIC ZONATION FOR WHEAT SCAB (FUSARIUM GRAMINEARUM) IN CENTRAL SHAANXI