L. Luo et al., Soybean yield loss to sudden death syndrome in relation to symptom expression and root colonization by Fusarium solani f. sp glycines, PLANT DIS, 84(8), 2000, pp. 914-920
Field studies were conducted to determine the relationships between soybean
yield and foliar disease index (FDX) of sudden death syndrome (SDS) as wel
l as root colonization by Fusarium solani f. sp. glycines, the causal agent
. Single-row plots in a soybean field with relatively uniform SDS incidence
and severity were identified at growth stage R6 on cultivar Pioneer 9492 i
n DeSoto, IL, in 1997 and 1998. For each plot, foliar disease index (FDX),
yield, and yield components were determined. In 1997, linear relationships
between yield (Y, grams per meter of row) and FDX were obtained from the wi
de-row (Y = 207.84 - 1.09 FDX) and narrow-row (Y = 126.66 - 0.745 FDX) plot
s, respectively A linear relationship (Y = 124.23 - 1.11 FDX) also was obse
rved in 1998. Increase in each FDX unit caused yield loss from 18 to 29 kg/
ha (0.7 - 1.1 g/m of row). FDX was negatively correlated with seed weight (
grams per plant) in both years and with seed size (grams per 100 seeds) in
1997. A no-tilled field at Southern Illinois University planted to soybean
cultivar Asgrow 5403 was divided into 25 plots in 1997 and 40 plots in 1998
. Root samples were taken from each plot at five or six sampling times duri
ng the seasons. Roots were used to isolate and enumerate E solani f. sp. gl
ycines on a selective medium to obtain the CFU. FDX was assessed and soybea
n yield was obtained from each plot. Soybean yield correlated negatively wi
th FDX in both years. Both yield and FDX correlated significantly with CFU
from slightly before growth stage R1 to R2 in both years, and with area und
er the pathogen population curve (AUPC) in 1997. An increase in one unit of
AUPC or CFU per gram of root at R6 was associated with yield loss of 0.19
or 0.014%, respectively.