University of Minnesota Extension
http://www.extension.umn.edu/
612-624-1222
Menu Menu

Extension > Minnesota Crop News > Archives > May 2013 Archives

May 2013 Archives

Small Grains Disease Update

| Leave a comment

Early Season Scouting in Small Grains: Tan Spot

With the overcast and humid days which many parts of the state have been experiencing in the last week, be sure to scout smalls grains for signs of early tan spot infection. Tan spot will be particularly prevalent on previous wheat ground. Spring wheat in trials on the Northwest Research and Outreach Center at Crookston has 100% incidence with tan spot. There is some tan spot in the winter wheat. Early signs of tan spot in fields south of Moorhead, Minnesota, have also been identified.


Tan spot is identifiable by the brown spots often surrounded by a yellow halo that appear on leaves. These may run together to form patches or larger areas of yellowing and browning.

View image

Be careful not to mistake nitrogen deficiency or symptoms of BYDV for tan spot.

If you do see tan spot, you can use a tank mix with herbicide and fungicide for control of this disease. If left unchecked, this disease will continue to progress and will impact yield. A number of different fungicides can be used for control of this disease ( see table) This year, we are interested in collecting isolates of tan spot. So if found, please can you contact me via e-mail smit7273@umn.edu BEFORE you spray and we will try to collect a sample.

10 Fungicide Table Early Season Wheat.jpg

BYDV could be another disease that we see this year if aphids become prevalent (particularly bird cherry oat and English grain aphids). Symptoms of BYDV will vary depending on the crop, variety and the growth stage at which the plants become infected. General yellowing of the leaves are common. Reddening also occurs, especially in oats, but is dependent upon variety and crop. These symptoms will usually start from the tip of the leaf and work their way down either edge of the leaf. Eventually the whole leaf may become yellow. If plants are infected with the virus early, they will often become extremely dwarfed, may produce excess tillers, and the leaves will have a more erect habit. If infection is severe, it may result in yield losses.

So whilst out looking for tan spot, it's a good idea to check for those aphids too!

by Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties
Posted Originally in the evening on May 30
UPDATE LATE MONDAY JUNE 3 - MORE DATA, A COUPLE OF NOTES

The "PDF" document listed provides data from fields we have information from so far for May 30 sampling and previous sample day information. We might get a couple more lab reports on Monday. We aim to sample fields again on Monday June 3 and will make a June 3 posting later in the day. 

Alfalfa Field Data May 30 2013.xls

For more information about using and interpreting information from alfalfa scissors-cut sampling or using PEAQ sticks to estimate feed quality go to

www.extension.umn.edu/forages/harvesting.html

Where stands are getting to 24 to 26 inches with buds showing, some farmers could be watching for suitable weather and field conditions to make better quality dairy hay. Some people might let some winter stressed fields go longer with the hope of better root health. We have shared some information about that in the May 23 and 28 postings.








By Lizabeth Stahl, Extension Educator - Crops, and Jeff Gunsolus, Extension Agronomist - Weed Science

With very tight windows of opportunity to plant this year, preemergence herbicides may not have been applied as planned.  Application of a residual herbicide prior to planting or emergence of the crop, in both corn and soybean, is a great weed management strategy overall and also a key tool in managing against herbicide resistance.  What are some of our options if soybeans emerged before a preemergence herbicide application was made?   

by Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties
Posted Originally May 28 10 p.m.
UPDATED May 29 about 5:30 p.m. with more data and a couple of notes about situations where PEAQ data is greatly different from lab test results.

The "PDF" document listed here is Central MN Alfalfa Harvest Alert Scissors-Cut Data and PEAQ readings received so far for May 28. We aim to sample again on Thursday May 30 and will post some of that information on Thursday and Friday afternoon.  

Alfalfa Field Data May 28 2013.pdf

For more information about using and interpreting information from alfalfa scissors-cut sampling or in using PEAQ sticks, go to

www.extension.umn.edu/forages/harvesting,html

SHOULD I WAIT LONGER TO HARVEST WINTER STRESSED FIELDS? (a couple of update notes....Follow "Continue Reading"



by Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties
Posted originally May 23 10 p.m. UPDATED May 24 5 p.m.

The "PDF" document listed here is Central MN Alfalfa Harvest Alert scissors-cut data and PEAQ readings received so far for May 23. We will be getting more information from May 23 and I will update the "PDF" document listed here and note when it was updated. We will take samples again on Tuesday May 28.

Alfalfa Field Data May 23 2013.pdf

If we get warmer weather with some sunshine, we could expect significant growth and maturing by Tuesday May 28. Some showers are in the forecast. Earlier fields could be ready for harvest by June 1. More people might be taking a closer look at the fields and the weather during the first week in June. It might be by the time the weather gives us a chance to harvest hay, the crop will be plenty ready.

For more information about using and interpreting information from alfalfa scissors-cut sampling or in using PEAQ sticks, go to

www.extension.umn.edu/forages/harvesting,html

SHOULD I WAIT LONGER TO HARVEST WINTER STRESSED FIELDS? Follow "Continue Reading"

by Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties
May 20 about 5:45 PM

The link listed here provides Central "MN Alfalfa Harvest Alert" scissors-cut data and PEAQ readings received so far for May 20. If we get more information from May 20 I will update the information in the link posted here. So far we have information from farms in McLeod, Wright and Benton Counties. Samples will be taken again on Thursday May 23.

Alfalfa Field Data May 20 2013.pdf

In taking samples in Benton County, I got back the office thinking: "The crop might not be as late getting ready for harvest...as it seems like spring was in getting here. Keep an eye on fields."

For more information about using and interpreting information from alfalfa scissors-cut sampling or in using PEAQ sticks, go to

www.extension.umn.edu/forages/harvesting,html



Hybrid Maturity Considerations for Delayed Corn Planting

By David Nicolai and Doug Holen, Extension Educators - Crops

 

The University of Minnesota Extension Forage Team has developed a list of resources available to livestock and alfalfa producers affected by the recent alfalfa winter injury and winterkill in 2013. These resources are available at the U of MN Extension forage website: http://www.extension.umn.edu/agriculture/forages/growth-and-development/ 

Sauk Centre Hay Auction Report May 2, 2013

| Leave a comment

by Dan Martens, U of M Extension Educator in Stearns-Benton-Morrison Counties

Three Items:

1. Reports from May 2, 2013 Sauk Centre Hay Auction (here)

2. Winter Alfalfa Injury Resources (read more)

3. Alfalfa Harvest Alert Scissors Cut Project in Central MN (read more)

MAY 2 HAY AUCTION REPORTS


May 2 2013 SC Hay Auction.pdf ... A summary of all tested hay lots and bedding materials sold... grouped by kind of hay, type of bale and 25 RFV points... cost per pound of dry matter and per RFV point are calculated.

History of Selected Lots 2012 2013.pdf ... A summary of hay auctions held this year showing Medium Square Alfalfa 101-200 RFV divided in 25 RFV groups, and medium sq. straw.

Graph 2001 to 2013 SC Hay Auction.pdf ... A line graph of these auctions from 2001 to 2013. For the Feb 16 auction, the 176-200 RFV group is just one load - so not really an average.

The next auction at Sauk Centre will be held on Thursday May 16.

By Daniel Kaiser

Extension Soil Fertility Specialist

With the variation in conditions we have seen this spring there are a few issues that may show up in fields related to cool and wet soils. Purpling of corn leaves due to phosphorus (P) deficiency and early season interveinal striping due to sulfur (S) may occur if temperatures remain cool and we continue to have frequent rains. I want to take some time and outline these issues and some of the related research that has been conducted in the past five years.

By John Wiersma
Agronomist
Northwest Research and Outreach Center

High pH, highly calcareous soils, common in western Minnesota, restrict the availability of soil Fe needed for optimum soybean growth and yield. On such soils, the amount of Fe fertilizer applied must surpass a threshold before there is sufficient available Fe in the soil solution to induce a positive growth response. Only a limited number of management tactics designed to improve the availability of Fe have been studied with soybean. These include variety selection, seeding density, seed-applied or in-furrow materials, and foliar treatments.

By Dr. Craig Sheaffer, David Nicolai and Doug Holen

An unusual amount of winter injury and winterkill of alfalfa stands occurred in south central and southern Minnesota. While reports do not represent a detailed analysis of where injury to alfalfa has occurred across Minnesota, they do suggest a need for producers to check on stands and evaluate them for potential winter injury.


Les Everett - Water Resources Center Education Coordinator, U of M. Randy Pepin and Jose A. Hernandez - Extension Educators, University of Minnesota - Extension

Using grid soil sampling to guide manure application can be a profitable investment, is the conclusion from case studies based on eight Minnesota farms. In fields where there is a history of non-uniform manure application, targeting new manure applications to areas with lower phosphorus and potassium soil test values can result in considerable economic returns above the cost of grid soil sampling. Variable rate manure applicators are not required when fields can be divided into application and no-application zones, with supplemental nitrogen fertilizer in the no-manure zones. The brief case studies are available on the University of Minnesota Extension web page for Manure Management and Air Quality http://www.manure.umn.edu, under Grid Soil Sampling for Manure Application. An introduction, the eight case studies, and a set of short video presentations based on the case studies are available at http://z.umn.edu/gridsoilsampling.

Funding for the development of these case studies was provided by the McKnight Foundation.

  • © 2014 Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy