Quantifying Alfalfa Yield Losses Caused by Foliar Diseases in Iowa, Ohio, Wisconsin, and Vermont

Plant Disease
F W NutterR M Sulc

Abstract

Although foliar diseases of alfalfa occur throughout the United States wherever alfalfa is grown, little work has been done to quantify yield losses caused by foliar pathogens since the late 1980s. To quantify the yield losses caused by foliar diseases of alfalfa, field experiments were performed in Iowa, Ohio, Vermont, and Wisconsin from 1995 to 1998. Different fungicides and fungicide application frequencies were used to obtain different levels of foliar disease in alfalfa. Visual disease and remote sensing assessments were performed weekly to determine the relationships between disease assessments and alfalfa yield. Visual disease assessments of percentage of defoliation, disease incidence, and disease severity were performed weekly, approximately five to six times during each alfalfa growth cycle. Remote sensing assessments also were obtained weekly by measuring the percentage of sunlight reflected from alfalfa canopies using handheld, multispectral radiometers. Yield loss estimates were calculated as the yield difference between the fungicide treatment with the highest yield and the nonfungicide control, divided by the yield obtained from the highest yielding fungicide treatment × 100. Over the 4-year period, significant a...Continue Reading

References

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Citations

Feb 17, 2006·Annual Review of Phytopathology·Serge SavaryForrest W Nutter
Oct 24, 2008·Phytopathology·K SteddomC M Rush
Feb 1, 2011·Journal of Applied Genetics·Suresh Kumar
Apr 1, 2012·Plant Disease·Gregory J ReynoldsSoizik Laguette
Aug 1, 2012·Plant Disease·Deborah A Samac, Dawn Foster-Hartnett
Aug 23, 2008·Proceedings of the National Academy of Sciences of the United States of America·Shengming YangHongyan Zhu
Sep 25, 2007·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Shengming YangHongyan Zhu
Jun 9, 2020·Frontiers in Plant Science·Miroslava HrbáčkováJozef Šamaj

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