Submitted to: Journal of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: 9/1/2005
Publication Date: 9/1/2005
Citation: Donald, P.A., Shannon, G. 2005. Impact of early soybean production system on soybean cyst nematode (heterodera glycines) reproduction.. Journal of Nematology. 37(3):366
Technical Abstract: The emerging trend of matching relative maturity of soybean cultivars with annual precipitation patterns for increased and stable yield is gaining popularity in the Mid-South. Early-maturing soybean cultivars are planted in mid- to late April to ensure adequate water availability and avoid summer moisture deficits during seed fill, in contrast to the current practice of planting maturity group (MG) V soybean cultivars in May, resulting in inconsistent yields and seed quality due to the effect of drought stress during seed fill and wet conditions at seed maturation. Soybean cyst nematode (SCN)-susceptible and resistant Roundup Ready soybeans from MG 0 through IV were grown at two locations in Missouri and one in Tennessee for two years to measure the effect of early maturing cultivars on SCN reproduction. Cultivars were planted in mid to late April in 2002 and 2003 and matured in late July to early August. The Pi for the MO loam site was 415 and 196, the MO sandy loam site was 1120 and 1335, and the TN sandy loam site was 3560 and 1146 eggs/120 cm3 of soil in 2002 and 2003, respectively. SCN Pf/Pi ranged from 0.01 to 0.7 with a mean of 0.3 in the MO loam site, from 0.3 to 3.0 with a mean of 0.85 in the MO sandy loam site, and from 0.3 to 3.1 with a mean of 0.9 in TN. Soybean yield was highest with MG IV cultivars.