| sources of nitrate yields in the mississippi river basin. | riverine nitrate n in the mississippi river leads to hypoxia in the gulf of mexico. several recent modeling studies estimated major n inputs and suggested source areas that could be targeted for conservation programs. we conducted a similar analysis with more recent and extensive data that demonstrates the importance of hydrology in controlling the percentage of net n inputs (nni) exported by rivers. the average fraction of annual riverine nitrate n export/nni ranged from 0.05 for the lower miss ... | 2010 | 21043271 |
| population genetic structure and genetic diversity of soybean aphid collections from the usa, south korea, and japan. | following its recent invasion of north america, the soybean aphid (aphis glycines matsumura) has become the number one insect pest of soybean (glycine max l. merr.) in the north central states of the usa. a few studies have been conducted on the population genetic structure and genetic diversity of the soybean aphid and the source of its invasion in north america. molecular markers, such as simple sequence repeats (ssrs) are very useful in the evaluation of population structure and genetic diver ... | 2013 | 23957674 |
| ovarian development and ovipositional preference of the western corn rootworm (coleoptera: chrysomelidae) variant in east central illinois. | the rotation of maize, zea mays l., and soybean, glycine max (l.) merr., has been the traditional cultural tactic to manage the western corn rootworm, diabrotica virgifera virgifera leconte, in the corn belt. the reduced effectiveness of this rotation as a pest management tool in east central illinois, northern indiana, and southern michigan can be explained by the shift in the ovipositional behavior of the new variant of western corn rootworm. the objective of this study was to evaluate the inf ... | 2004 | 15154460 |
| impact of developmental maturity of soybean on the seasonal abundance of soybean aphid (hemiptera: aphididae). | the soybean aphid, aphis glycines matsumura (hemiptera: aphididae), alternates between a primary overwintering host (buckthorn, rhamnus sp.) and a secondary summer host (soybean, glycine max). selection of soybean cultivars with different maturity groups may provide growers with a management tool for a. glycines, either directly through its effect on summer populations that cause economic damage or indirectly through its effect on the production of migrants that disperse to the primary host in f ... | 2010 | 20388278 |