http://www.uwex.edu/ces/ag/plantdoc/ Cases for UWEX Cooperative Extension PlantDOC Tue, 24 Nov 2009 10:11:25 CST en-us http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=13998 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=13998 Wed, 23 Sep 2009 11:11:42 CST The symptoms shown in the pictures are showing up in various situations in Marinette & Oconto Counties this year. Most severe symptoms are on corn on corn on the drier soils. The pictured plants are from a field of Garst hybrids, in which about 60% of the plants exhibit some degree of these symptoms. Only areas without symptoms are on moister soils. I know that there are fungal leaf spot issues, but am mostly concerned about the interveinal chlorosis and what may be interacting to cause that. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8430 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8430 Thu, 31 Jul 2008 12:00:00 CST Soybeans following corn planted mid-May, Variety NK H-1604RR, and sprayed with Roundup at label rate on 6-17-08, no fungicide applied. The soybeans in randomly spreading areas-not defined by drainage, are showing progressive decline with chlorosis/decay beginning on lower trifoliates and moving upward. About half of the field is normal. Initial guess is septoria/Brown Spot. Lacking any recent soil tests. Considering plant tissue-soil analysis and sending specimens in to plant pathology. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=7310 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=7310 Tue, 24 Jul 2007 12:00:00 CST There are a number of soybean plants in a grower's field that are showing leaf chlorosis. I'm thinking a nutrient deficiency. Any ideas? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3930 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3930 Mon, 19 Jul 2004 12:00:00 CST With the persistent and heavy rains we've had this spring and summer, many fields in Columbia County are showing signs of nitrogen deficiency due to waterlogged soils. These photos show unique patterns of chlorosis and stunting in a low lying field, apparently resulting from slight differences in drainage within the field. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1612 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1612 Wed, 01 Aug 2001 12:00:00 CST Field corn (Roundup Ready CropPlan Hybrid) has been showing this symptomology since early July. The corn is following corn, prior to that it was unimproved sod for many-many years. No potash has been applied other than with starter in 2000 and in 2001, 10 gallons of liquid 10-34-0 starter was applied as a side placement. 250 pounds of 46-0-0 plus 50 pounds of ammonium sulfate was broadcast applied as the nitrogen source. Three of the growers fields are dominated by plants with this appearance. All of the dozens of other fields he has received the same fertilizer rates and do not show this appearance. The lower leaves are most affected up to and slightly above the ear leaf. The newer leaves seem little affected and are green. The yellow streaking pattern seems consistent with potassium deficiency. I suspect that these somewhat wet soils that were wet and cold early followed by hot/dry conditions have had an impact on the potassium deficiency risk. This morning I asked his consultant to send in the plant tissue samples for confirmation. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1550 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1550 Fri, 27 Jul 2001 12:00:00 CST Soybeans are light green to yellow in field pockets. Poor nodule development as well. My sense is this is nitrogen deficiency from saturated soils earlier in the growing season. When I checked the nodules from beans on higher ground, they were chuck full. Comments welcome. Manitowoc County photos, 7/28/01. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=331 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=331 Mon, 26 Jun 2000 12:00:00 CST Four of the rows on the eight row planter that planted this field were not delivering the correct amount of 28%. Note the 8 row segments that are deeper green and slightly taller than the other 8 row segments. On average, the desired amount of 28% was delivered across the field. How far does 28% migrate from the injection site? Will the rows that were closest to the units that were operating correctly receive some of this N and yield normally?