Effects of Cycocel (Ccc) and Fungicide Sprays on Spring Wheat Grown at Three Nitrogen Levels

Spring wheat (Triticum aestivum L. ’Opal’) was grown at three N levels, 80, 120, and 160 kg N/ha, to evaluate effects of Cycocel (CCC) and fungicide sprays in a 2-yr test. CCC decreased yields, in the absence of lodging, by increasing disease severity. Fungicides decreased disease severity while increased levels of N increased the severity of powdery mildew. The combination of high N plus fungicides produced the highest yields because the healthier plants gave greater responses to higher levels of N than did diseased plants. Levels of N above the 80 kg/ha rate did not increase yield of Opal wheat in the absence of appropriate fungicide sprays.