http://www.uwex.edu/ces/ag/plantdoc/ Cases for UWEX Cooperative Extension PlantDOC Mon, 23 Nov 2009 02:32:23 CST en-us http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=14044 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=14044 Wed, 11 Nov 2009 04:14:10 CST A 4 acre corner of a 40 acre field is exhibiting bouquet ear syndrome with multiple ears per shank. Pulling the husks back reveil a few kernels at most per ear. An occasional plant (5% of total) have near normal developed ears. The majority of the area will not produce any yield. This is a corn field following several years of soybeans. I was told by the seed rep that Aim was used as a burndown with soybeans the year before followed by Roundup. Lumax was apparently applied to corn this spring at 2nd leaf stage. Planted May 5th, and a 98 day maturity variety with several trait stacks. Noticed the soil in this area of the field to be wetter than the rest of the field. I took a video with much greater detail of what the field looks like but will need to find a method to get on-line. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=13829 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=13829 Wed, 12 Aug 2009 03:36:07 CST Field planted no-till on 6/4/09 following a burn-down of GlyStar Plus several days earlier. Corn following alfalfa. Good rains following planting resulting in an excelent stand. Laudis applied on 7/8/09. Corn is currently 2 to 6 ft tall depending on location in field. From my obvservations I think that planting depth is the primary reason for lack of uneven plant growth. Some plants were planted as shallow as 1/2 inch. Lack of root development also has resulted in what appears to be K defficiency. Carrie? Chris, What impact might Laudis have on plant growth? Other comments? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=13545 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=13545 Thu, 04 Jun 2009 01:25:39 CST Corn planted late April into soybean stubble. Herbicide is G-max lite at 12 oz/acre and clarity. Only seed treatment was Apron. Corn plants are missing in two areas of field. No carcasses or underground leafing-out found. Very difficult to even find seed in furrow. Seed that was found is well rotted. Planting depth is ok. Sandy soil. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=9250 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=9250 Wed, 04 Mar 2009 12:00:00 CST The current input price, farm product price squeeze has farmers looking at options. a dairy farmer with sufficient manure has all the P and K necessary for a corn crop, only needed would be some additional N for a corn on corn field. For a corn on alfalfa field he has more than enough N, P and K for a corn crop. Growers in southern WI regularly apply all fertilizer broadcast. Are there trials from Marshfield showing results from all brodacast vs. row application of fertilzer? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=9150 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=9150 Thu, 06 Nov 2008 12:00:00 CST Small grower has 1/4 acre of white corn he received from a friend in Illinois (this is probably where things started go wrong). The white corn is a 120 day corn used for corn chips. Red streaks are found in a number of the kernels with some of the redness on the husk. It does not appear to be gibberella or a rot as the kernels are hard and seem healthy except for the discoloration. The corn is cultivated with no herbicides used. Any ideas what were dealing with? Virus? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=9070 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=9070 Mon, 13 Oct 2008 12:00:00 CST There have been performance concerns regarding the Bt gene to effectively control corn rootworm. Included are photos that clearly show that in this Sheboygan County field the CRW Bt gene did not perform. However the best performance in this field combined the CRW Bt gene and insecticide. All insecticide applications were at the 1/2 rate, (Force). A Syngenta product (Golden Harvest) but do not know what event. Comparisons included: CRW with insecticide, Non CRW with insecticide CRW only: Non CRW & no insecticides http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8750 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8750 Tue, 02 Sep 2008 12:00:00 CST This corn field was damaged by a combination of wind and hail in mid-July before tassel. Although many stalks snapped off at waist height, ears developed on these "half stalks". Currently, smut is growing on many......I repeat, many....ears and leaves are rust infested. The grower's question is simply this, "Can I chop and feed this stuff?" His primary concern is the all the smut, but should there be other concerns as well? Should feeding be limited to heifers? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8311 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8311 Thu, 10 Jul 2008 12:00:00 CST Corn field sprayed by local co-op has stunting, poor growth reddish dicolored leaf edges on lower leaves, Co-op sprayed 1.5 qts roundup plus NH4SO4 (amount?). Damage follows the path of the sprayer, tracks are evident in the field, no apparent dammage to corn sprayed under the left boom, damage is greatest directly behing the truck with damage also on corn sprayed with the right boom. Damage appears to lessen as the sprayer progress over the field, a second field was sprayed which shows damage directly over wheel tracks but not near as much damage under the right spray boom. Field was sod for about 10 years prior to being plowed thsi spring. Plant samples were went today and soil samples will be sent tomorrow. My thought is contaminated filters ahead of the spray line for nozzles behind the truck and also for the right boom causing enough chemical contamination thru causing plant damage. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8192 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8192 Tue, 01 Jul 2008 12:00:00 CST Forgot to invclude a 2nd picture http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8191 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=8191 Tue, 01 Jul 2008 12:00:00 CST Producer has two notill corn fields that are showing severe stunting and yellowing with some leaf striping as well as some lower eleqaves showing re discoleration on the outer leaf margins. both fields were notill, 1st field was sod in 07, 2nd field was wheat in 07. Soil type looks like a loamy sand. both fields had 5gal liguid 3-18-18 with zinc and trace elements at planting, 2nd fld recieved urea 160 units of N May 23 with 1/2" rain shortly after, 1st field recieved urea 100 units N plus 150# potash. After spreading field 1 farmer had some left so he drove across the lane and spread on an adjacent conventional till corn field. Yellow stunted corn appears to follw the path of the fertilizer spreader. Grower is concerned that there may have been something in with the urea that could be causing a toxic issue with the corn. Any thoughts?? thanks http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=7450 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=7450 Wed, 22 Aug 2007 12:00:00 CST These beans were last sprayed June 27 with 19 oz. Roundup with Spray Soft. Not in the vicinity of corn where Dicamba drift could be a problem. Field pattern of injury is in strips; possibly pesticide residue left in some (but not all) hoses? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=7170 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=7170 Thu, 21 Jun 2007 12:00:00 CST Ten acre corn field in SW Portage County. Had been in sod for past 13 years. The field has a grass pasture and grassy road sides surrounding it. Spring tilled and planted May 12. Initial sample was brought to my office June 6th with shot holes on young leaves but no larvae found. Did a field visit June 15th and found 100% of plants with shot holes in leaves 1 or 2 through 5 or 6. Dissected several plants and found no larvae. Did not see any edge effects. What are your recommendations? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=6910 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=6910 Fri, 25 Aug 2006 12:00:00 CST Hail storms hit many areas of Western Wisconsin on the afternoon of 8-24-06. Damage to corn, soybeans, alfalfa, buildings and vehicles. The hail was accompanied by significant wind with hail varying from marble to baseball size. In Pierce County, the location stretches 9 miles but the path in St. Croix, Pierce, Dunn, Pepin, Buffalo and other Western Wisconsin counties is over 70 miles. Corn Leaf stripping and stalk bruising varies. In the corn photos the leaf loss and lodging varies. Soybeans seemed to weather the hail storm better. Alfalfa was flattened. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=6590 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=6590 Mon, 12 Jun 2006 12:00:00 CST Corn is purple and dieing, over 50% of the stand is effected. There appears to be no pattern to the effected plants, although plants on the outside rounds and a strip that only recieved 1/2 rate of roundup appear larger and have less purpling. Field planted with Renk235RR corn first week of May, previous crop corn. Sprayed with Roundup last week of May. Photos taken June 9th. Photos 1-3 are from the field in question, photos 4 and 5 show the effects of roundup on conventional corn from another field. For this field the farmers started planting the field with a little bit of conventional corn seed left in the hoppers. You can see the effects of the roundup for about the first 200 feet in the field. He did come back and reseed along side with RR corn. It is this comparison that indicates the field in question may have been planted with a mixture of RR corn and conventional. The farmer claims all the corn put into the planter for the field in question were labeled RR. Could there be another likely cause for this random purpling effects. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4270 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4270 Tue, 26 Jul 2005 12:00:00 CST Would like a confirmation that this is an armworm problem? Was found in a corn on corn field on contour strips with alfalfa. Weed control was good at this time, but grass stubble suggests herbicide was applied late. Plenty of worms in varying sizes found in whorls, but no moths flying around or eggs found by this novice armworm guy at dusk. Had heavy rains last night which may have knocked down the population???? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4252 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4252 Wed, 20 Jul 2005 12:00:00 CST Photos show a corn field on light soil under severe drought conditions. The producers agronomist has suggested taking it now as corn silage. Photos do show some green tissue and potential for further growth with adequate rainfall Any thoughts on taking it now verses waiting. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4210 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4210 Mon, 20 Jun 2005 12:00:00 CST Corn following corn in high residue minimum tillage. Planted April 26th at a population of 32,000. On approximately 90 acres, only about 50 to 60 percent stand grew. The stand counts in the affected 90 acres range from 15,000 to 18,000 plants. Some missing plants have seeds that appear not to have germinated and some show carcasses of just the radical root. Those with tiny root present never had a shoot to emerge. Only one hybrid (Garst 8590) showed this problem. All other hybids have stands at about 31,000 plants. Liquid starter fertilizer 18-34-0 was applied at 6 gallons per acre and Regent liquid soil insecticide was applied in-furrow. The herbicide tank mix of Keystone and Hornet was applied in a timely way. Seed from the same lot is still available from the grower and has been stored in a dark cool location. A Garst representative visiting the site/s have concluded that the problem was Pithium. I would like further opinion since Pithium (seedling blight) does not fit my the symptomology and other observations. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4032 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=4032 Tue, 21 Sep 2004 12:00:00 CST Corn damaged in August 3rd hail storm in the Fall River area in Columbia County. Pollination was disrupted by hail damage, resulting in short ears. Bruising of developing kernels has resulted in mold growth. Uninsured growers may be tempted to harvest some of these fields for silage. Clearly this would not be advisable in terms of general quality of the resulting silage. How great is the risk of mycotoxins being present and can molds that produce mycotoxins be visually identified? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3970 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3970 Thu, 29 Jul 2004 12:00:00 CST Widespread slug damage in this field. Interestingly, it is a 3rd year corn field that was chiseled in spring and planted in mid-June after the monsoon season. Tallest corn in the field is knee high, well beyond the seedling stage but still being fed on by slugs. Some plants entirely gone. Is some treatment appropriate or do we just let them run their course? I don't really see any threshold levels listed. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3890 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3890 Mon, 12 Jul 2004 12:00:00 CST Corn emergence problem. No-till corn into corn residue. Sprayed late May. 2.2 qt Degree X-tra, 2oz Hornet, 22oz Roundup. Moist soil condtions at planting. Some shorter plants appear to be planted to shallow. Seed furrow in some areas did not cover well. Decayed seed coat can be seen on some photos. What is recommended planting depth with no-till and above mentioned herbicide mix? Any suggestions for better seed furrow coverage? http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3871 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3871 Wed, 30 Jun 2004 12:00:00 CST Planting and replanting has been the name of the game over the past two weeks. This is occuring to a large degree in areas (both small and large) within fields that were planted earlier. This true for both corn and soybeans. Harvest timing is going to be a nightmare. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3791 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3791 Mon, 24 May 2004 12:00:00 CST I'm not sure if we're setting any records for rainfall, but 10 to 15 inches in a little over 2 weeks has to at least be in the team picture. The ramifications for grain crops are endless, plus there is hay to make. There's no chance of getting in fields before June 1 and some may still be too wet for a July 4 picnic. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3771 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3771 Fri, 14 May 2004 12:00:00 CST It will be one week from tonight that the monsoon season began with many planted areas underwater for the full duration. Even larger areas and entire fields have been at field capacity for a week. The issues, of course, are numerous: seed survival, replanting, future crusting, seed depth in eroded and silted areas, N loss, etc. Most N was put on last week, hence we would expect there's still a large percentage in the ammonium form but there has been a large displacement of anhydrous for urea as the preferred N source. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3671 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3671 Wed, 01 Oct 2003 12:00:00 CST Crop Plan 344 planted into two year fallow sod on May 10. Harness and Hornet split applied. Harness and Hornet applied pre on half of field. Harness applied pre and Hornet post on other half. 150# Nitrogen applied as 28%. Drought conditions from July 14 to September 13. Windy conditions 20+ mph winds in last week of September. Half of the field has gone down due to stalk rot. Very little variability in soil type across plot. Could the Hornet applied as post have contributed to problem? Does soil type play a direct role in harboring stalk rot fungus? Other fields planted with Crop Plan 344 look fine. http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3630 http://www.uwex.edu/ces/ag/plantdoc/viewCase.cfm?cid=3630 Mon, 08 Sep 2003 12:00:00 CST About one month ago I was contacted by a farmer to come take a look at some stunted corn. The field was no tilled planted with Renk 224 Roundup Ready into winter killed new seeding alfalfa the end of May. The field was sprayed the first week of June prior to corn emergence with Roundup Original, Preference and Amounium sulfate to kill what little alfalfa was left and exsisting weeds. Corn growth was "normal" initially, however by early July there were obvious differences in corn height and color across the field. The field had been farmed as two fields prior to 2003 and there is a noticeable difference in corn growth based on previous crop. Interestingly, the only "normal" looking corn in the whole feild was in a corner that had not been plowed since 1997, and had been left uncropped since 2000. Soil test were taken in 1998 the pH was adjusted to ~6.5 and managed to maintain optimum P & K. The soil is a sany laom with 2.0% O.M. Field history, east half 2000 corn, 2001 new seeding (winter killed) 2002 new seeding (winter killed): west half 2000 established aflalfa, 2001 corn, 2002 new seeding (winter killed). The last spray this field had prior to this spring was the east half was sprayed in 2001 for broadleaf weeds in the new seeding, and the west half was sprayed in 2001 with atrazine + a braodleaf herbicide. The fact that the fallowed corner of the field has "normal" looking corn indicates that there is something unique about this. Plant samples have been analyzed by Brian Hudelson and he did recover small amounts of fusarium, but not enough to cause this wide spread damage. Could it be nematodes? Some sort of "chemical" injury?