Effects of cycocel (CCC) and fungicide sprays on spring wheat grown at three nitrogen levels

Johnston, H.W.; MacLeod, J.A.; Clough, K.S.

Canadian Journal of Plant Science 59(4): 917-929

1979


ISSN/ISBN: 0008-4220
DOI: 10.4141/cjps79-147
Accession: 000646908

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Abstract
In 1976-7, spring wheat cv. Opal was given 80, 120 or 160 kg N/ha to evaluate effects of Cycocel , Septoria spp. and Fusarium culmorum. Fungicides decreased disease severity while increased levels of N increased the severity of powdery mildew. The combination of high N plus fungicides gave the highest yields because the healthier plants gave greater responses to higher levels of N than did diseased plants; applying >80 kg N/ha did not increase yield in the absence of appropriate fungicide sprays. Cv. Opal was grown at 80, 120 and 160 kg N/ha in a 2 yr test. The growth regulator CCC decreased yields, in the absence of lodging, by increasing disease severity. Fungicides decreased disease severity, while higher N levels increased powdery mildew (Erysiphe graminis). The combination of high N + fungicides produced the highest yields because the healthier plants gave greater responses to higher N levels than did diseased plants. N levels above 80 kg/ha did not increase yield in the absence of fungicide sprays.