http://www.uwex.edu/ces/ag/plantdoc/ Cases for UWEX Cooperative Extension PlantDOC Wed, 25 Nov 2009 02:08:10 CST en-us http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=13947 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=13947 Fri, 11 Sep 2009 01:53:43 CST Conventional soybean planted into corn about mid-May. Outlook and First Rate applied pre-emergence. Many lambsquarters escaped control. About 1/4 of field looks like these samples. Many aphid skins. No visible sign of BSR. Japanese beetle feeding on some leaves. Problem a result of combination of poor weed control, dry weather, and an aphid outbreak? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8830 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8830 Tue, 09 Sep 2008 12:00:00 CST Agronomist from local co-op brought in soybean plants. He says 75% of the field looks like these plants. The remaining 25% look excellent and are a 12 to 18 inches taller. Aphids were obviously very high. Agronomist says the 25% that is good is in a strip which may follow a spray pattern. Farmer told agronomist that he noticed the problem about 3 to 5 days after roundup ready beans were sprayed with Roundup in mid-June. Brown stem rot is ruled out as split stems look good. Nodules are pink but few and smaller Can herbicide damage be detected/investigated this late? If so, what could it be? Another case where late detection may not supply many answers. Any other thoughts? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8631 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8631 Fri, 22 Aug 2008 12:00:00 CST Chris and Shawn, This Soybean field was sprayed with Assure ll with crop oil to control volunteer corn. About 10 days ago. Was also tank mixed with an insecticide for aphids. Any thought on the leaf symptoms we are seeing in these pictures. A mix or symptoms are expressing themselves. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4330 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4330 Tue, 16 Aug 2005 12:00:00 CST These are early planted, 0.9 RM soybeans. Pods are splitting open while beans are still green. Dark lesions appear on both pods and the green bean, but not in all cases (i.e. there can be lesions without pod splitting and no lesions with pod splitting). Is the pod splitting an environmental phenomenon? It almost appears that the beans are out-growing the pod. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4290 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4290 Wed, 03 Aug 2005 12:00:00 CST Soybean leaves show distinct cupping from the tip end of the leaf. Roundup ready beans had roundup plus ammonium sulfate applied for weed control. Oats were on the field last year so no carry over. I have seen this on beans in Dane county and figured it was a reaction to the herbicide mix, the beans grow out of it. I never checked for an official explanation. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4010 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4010 Wed, 25 Aug 2004 12:00:00 CST In addition to the frost damage on corn in the central sands area, there are some significant areas of damage to soybeans as well as snap beans. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3990 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3990 Thu, 19 Aug 2004 12:00:00 CST This field of soybeans has shown some uneven development since July. The symptoms include irregular areas of extremely stunted soybean plants. The stems are small, root nodulation is compromised and the roots seem to be more brittle than the healthy plants. This field did not show symptoms of herbicide damage early in the season but I cannot rule it out since this is my first look at the field. This field does have a history of repeated soybean plantings in previous years. There does not appear to be browning of the pith in the stem or root (#336). Photos of the field are #333 and #334. A side by side comparison of healthy versus stunted is #335. The variety is unknown. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3910 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3910 Fri, 16 Jul 2004 12:00:00 CST The photo's of the organic soybeans (Vinton 81 variety) were planted June 12th. This field is organically certified and does not have any herbicide applications. The previous crops were: oats in 2003 and soybeans in 2002. The soybeans were not innoculated in 2002 nor were they in 2004. The symptomology is isolated to the very west side of the field on sandy loam soil and near a woods edge. Some soybean plants now at the 4th trifoliate leaf-V4 show an interveinal chlorosis on one or more of the trifoliates. No association with earliest or later growth. The affected plants show stunting and minimal nodule development as compared to the normal looking soybeans in the photo's. Is the problem related to nutrients, innoculant or possibly disease? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3830 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3830 Mon, 28 Jun 2004 12:00:00 CST Soybeans that are now up in the second trifoliate. Cotyledon leaves have severe brown spots with symptoms also affecting some of the leaves on the first trifoliates. Planted probably about 4 wweks ago, third trifoliates are just emerging. Weather here has been cooler and wetter than normal. Roundup ready beans, last year the field was also in beans. Some plants are dying from root rot at the soil surface. Field has been sprayed not too long ago with roundup. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3610 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3610 Wed, 03 Sep 2003 12:00:00 CST Drought conditions continue and questions associated with soybean yield potential are numerous. Please give you best estimate/guestimate. 20 random plants were taken from 5 similar fields. Soybean plants have just started to wilt/turn. Bean seeds are stll green and somewhat small. Some pods have been aborted. Pod counts ranged from 4 to 39 pods per plant. Average pod count was 19 and the average "filled" pod count was 18 per plant. One third of the pods have 2 or less seeds per pod. The variety is a high yielding Roundup Ready soybean drilled on 7" spacing and received a timely insecticide treatment for soybean aphid. Any guess on yield given these data and no rain forecast for the next 10 days. The producer is considering harvesting for forage. The attached digital photo's show the fields and low pod count (Right) versus higher pod count plants(left) sampled. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3570 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3570 Wed, 20 Aug 2003 12:00:00 CST This is the second field that I've looked at in Columbia County with these symptoms and I've talked to a number of crop consultants who have seen similar problems. The plants are stunted or dying in random, irregular patches in the field. Tops are wilted and brown, some new leaves are coming out on some plants. Leaves are chlorotic. Roots are minimal, appear to be rotted off. Those plants that seem to be recovering have new, healthy roots coming, but with no nodules. The interior of the stem is brown at the base (see photo). Brian Hudelson is finding pythium and fusarium in these plants. Why would these organisms be causing this kind of damage this year? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3514 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3514 Fri, 25 Jul 2003 12:00:00 CST Soybeans are severely stunted and chlorotic in several large irregular patches in a 24 acre field, sandy loam soil, no-tilled into a previous crop was corn. Plants are losing or have lost leaves, some have new growth, others are dying. Beans are Roundup Ready, planted in late May. I don't yet have an exact spray date, but farmer first noticed the problem about 2 weeks ago. Largest area of injury is adjacent to the headlands area near the entrance to the field. Headlands plants and weeds are healthy. In unaffected areas, weed control is good. In some parts of the field, sections of healthy plants are interspersed with stunted ones. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3190 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3190 Tue, 08 Oct 2002 12:00:00 CST Seems to be more green stem syndrome than usual. A little surprising in that we didn't have much aphid pressure for virus transmission. Comments appreciated. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3130 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3130 Mon, 23 Sep 2002 12:00:00 CST Photo shows severity of bean leaf beetle damage. Taken on a farm visit in Walworth County on 9/22/02. Fortunately, bean leaf beetles were not documented in Manitowoc County during the current growing season. In terms of prevention, is there anything that growers can do to prevent this problem from moving to previously uninfected areas? Photo taken 9/22/02. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3110 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3110 Thu, 29 Aug 2002 12:00:00 CST Entry from Country Horizons Coop., Manitowoc Co. Soybeans planted first week of May. Pursuit Plus/Sencor ppi.Corn in 2001 (Dual ppi, Callisto post). Conventional tillage. Good growing conditions with excellent crop response early. Dry period started in late June. Rains returned late July with heat (rapid growth). First 6 nodes unaffected. Upward cupping on 7th node trifoliates similar to minor dicamba damage. Leaves become progressively more damaged from node 8-11. Symptoms are small and deformed leaves with downward cupping and very pronounced parallel veins. A few plants are starting to grow out of damage at node 12. Plant growth (height) and pod development has progressed normally through out entire plant(would be surprised if any reduction in yield). Field is 15 acres and rolling. Entire field affected with little exception. High fertility. Unknown corn herbicide application across the road at approximately node 5 timing. Corn field in question only borders 25% of soybean field. Comments appreciated. (S.H.) Similar symptoms found elsewhere as well. Possible reaction to dry weather. Possibly leafhopper impact. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2930 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2930 Tue, 30 Jul 2002 12:00:00 CST Interesting scenario. Grower suspected that shortened beans in center of photo were caused by herbicide damage. Pattern actually follows the tire tracks from where manure was spread on this field during seed bed preparation. Compaction slowed root development and shortened beans during dry weather. Yield reduction on these shortened beans may or may not be similar to wheel traffic damage on soybeans although shortened beans can obviously yield pretty well. My recommendation at this point to the grower is to limit manure applications to not over 30 units of N equivalent per acre to avoid lodging in soybeans and to apply the manure in the fall. Yield reduction at this point from shortened beans is hard to predict. Agree? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2910 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2910 Tue, 16 Jul 2002 12:00:00 CST Roundup Ready soybeans planted into field that had not been planted to soybeans before. Reduced rate of innoculant was used. Nodules on roots are not pink on yellowing plants. Field was also sprayed with glyphosate 10 days ago in hot weather. Is yellowing enhanced with glyphosate application in hot weather? What yield loss could be expected with improper innoculation? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2269 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2269 Mon, 22 Oct 2001 12:00:00 CST This harvest has brought a variety of calls on abnormal soybean development. Some easy to explain, some not so easy. This field of P91B01 soybeans was planted May 15 and sprayed with Raptor (+oil & AMS post-emerge). Many of the plants with pods top and bottom but none in middle (see photos). I'm assuming some sort of stress during early mid-pod development but would take other opinions or possibilities. This is a relatively low field (i.e. moisture stress unlikely but probably can't be ruled out). http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2229 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2229 Tue, 02 Oct 2001 12:00:00 CST Soybean growth and development,(R8), full maturity, 9/2/01, day 126 after 5/31/01 planting, 1.1 maturity rating. This completes the series of growth and development photos for 2001. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2189 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2189 Wed, 26 Sep 2001 12:00:00 CST Soybean growth and development,(R7), beginning maturity, 9/24/01, day 116 after 5/31/01 planting, 1.1 maturity rating http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2129 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=2129 Tue, 04 Sep 2001 12:00:00 CST Soybean growth and development,(R6), full seed, 8/31/01, day 92 after 5/31/01 planting, 1.0 soybean maturity rating. Manitowoc County photo, 5/31/01. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1769 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1769 Mon, 13 Aug 2001 12:00:00 CST Soybean growth and development,(R5), beginning seed, 8/13/01, day 74 after 5/31/01 planting. Manitowoc County photos, 8/13/01. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1649 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1649 Fri, 03 Aug 2001 12:00:00 CST Soybean growth and development,(R4),full pod, 8/2/01, day 63 after 5/31/01 planting. Manitowoc County photos, 8/2/01. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1549 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1549 Fri, 27 Jul 2001 12:00:00 CST Soybean field on sandy soil. Field was sprayed with Raptor and we are seeing the diagnostic red veination on the backs of some leaves. There is not the necrosis along leaf margins that is usually associated with it. Instead we are seeing entire dead plants, sometimes right next to completely healthy plants. Could there be a disease issue here as well? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1449 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=1449 Tue, 24 Jul 2001 12:00:00 CST Round-up ready soybeans planted May 1st. Sprayed with Roundup on June 24-25. No other herbicides applications made. Foliar micro-nutrients tank mixed with Round-up. Leaf cupping in a sifnificant part of one field and smaller areas in other fields. This farm has about 800 acres of beans. Grower mentioned that he first saw the cupping about 10 -14 days ago. Plants look better since we have had about .75 inch rain in the past several days. Only a few plants have as many aphids as the one in the photo. What is the threshold for treatment of aphids. Is this cupping typical of aphid feeding?