caa a22 4500 467929750 CHVBK 20180406152940.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s10658-006-9027-2 doi (NATIONALLICENCE)springer-10.1007/s10658-006-9027-2 Impact of Foliar Diseases on Photosynthesis, Protein Content and Seed Yield of Alfalfa and Efficacy of Fungicide Application [Elektronische Daten] [Sheau-Fang Hwang, Heping Wang, Bruce Gossen, Kan-Fa Chang, George Turnbull, Ron Howard] Foliar pathogens attack alfalfa wherever the crop is grown, but their impact, especially on seed production, is poorly understood. In greenhouse trials, leaf spot injury caused by inoculation with various pathogens reduced the crude protein content of infected alfalfa leaves by 22% compared with a healthy control. There was a negative relationship between disease injury and the photosynthetic efficiency of alfalfa plants, as determined by measuring chlorophyll fluorescence in leaves from inoculated vs. non-inoculated seedlings. In field trials at two sites in Alberta from 2001 to 2003, inoculation with Phoma medicaginis increased disease incidence in four of six trials, Phoma sclerotioides increased incidence in four of five trials, and Leptosphaerulina trifolii and Stemphylium botryosum increased incidence in two of six trials. There was a trend for inoculation treatments to reduce seed yield, despite high levels of background infection by indigenous pathogens. The fungicides benomyl and propiconazole inhibited radial growth of Phoma spp. in vitro and reduced disease incidence in inoculated greenhouse experiments. In field trials, applications of benomyl and propiconazole reduced disease incidence, but did not always increase seed yield. Springer Science+Business Media, Inc., 2006 chlorophyll fluorescence nationallicence crude protein nationallicence leaf spot nationallicence Medicago sativa nationallicence seed yield loss nationallicence Hwang Sheau-Fang Alberta Research Council, T9C 1T4, Vegreville, AB, Canada aut Wang Heping Alberta Research Council, T9C 1T4, Vegreville, AB, Canada aut Gossen Bruce Agriculture and Agri-Food Canada, Saskatoon Research Centre, S7N 0X2, Saskatoon, SK, Canada aut Chang Kan-Fa Alberta Agriculture, Food and Rural Development, Field Crop Development Centre, T4L 1W1, Lacombe, AB, Canada aut Turnbull George Alberta Research Council, T9C 1T4, Vegreville, AB, Canada aut Howard Ron Alberta Agriculture, Food and Rural Development, Crop Diversification Centre South, T1R 1E6, Brooks, AB, Canada aut European Journal of Plant Pathology Kluwer Academic Publishers 115/4(2006-08-01), 389-399 0929-1873 115:4<389 2006 115 10658 https://doi.org/10.1007/s10658-006-9027-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10658-006-9027-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hwang Sheau-Fang Alberta Research Council, T9C 1T4, Vegreville, AB, Canada aut NATIONALLICENCE 700 1- Wang Heping Alberta Research Council, T9C 1T4, Vegreville, AB, Canada aut NATIONALLICENCE 700 1- Gossen Bruce Agriculture and Agri-Food Canada, Saskatoon Research Centre, S7N 0X2, Saskatoon, SK, Canada aut NATIONALLICENCE 700 1- Chang Kan-Fa Alberta Agriculture, Food and Rural Development, Field Crop Development Centre, T4L 1W1, Lacombe, AB, Canada aut NATIONALLICENCE 700 1- Turnbull George Alberta Research Council, T9C 1T4, Vegreville, AB, Canada aut NATIONALLICENCE 700 1- Howard Ron Alberta Agriculture, Food and Rural Development, Crop Diversification Centre South, T1R 1E6, Brooks, AB, Canada aut NATIONALLICENCE 773 0- European Journal of Plant Pathology Kluwer Academic Publishers 115/4(2006-08-01), 389-399 0929-1873 115:4<389 2006 115 10658 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer