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Extension > Minnesota Crop News > May 2010

Friday, May 28, 2010

Early season tan spot

Early season tan spot can be readily found across the Red River Valley. Especially in wheat on wheat situations the disease can readily be found. One of the characteristic symptoms of these infections at the 2 to 3 leaf stage is a yellowing discoloring of whole leaves. This is a more extreme expression of the same the yellow halo that surrounds the tan spot lesions in more mature plants. Be careful not to mistake this yellowing for a nitrogen deficiency.

High Temperatures, Spikelet Counts, and Yield Potential

Much of the earliest planted wheat in the Red River Valley is approaching the 5 leaf stage. At this time the initiation of the head has begun. After the number of tillers that were initiated over the past three weeks, the number of spikelets is the second the three yield components that ultimately will determine yield. Like tillering, the number of spikelets is also greatly influenced by temperature. The figure below shows what happens as the average maximum temperature increases from 65 to 85; the average spikelet counts declines almost by a third from 17 to 13.

Thursday, May 27, 2010

Alfalfa Harvest Alert Info in Central MN - May 27, 2010

By Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties

Posted Originally Thursday Evening May 27, 2010
Alfalfa Harvest Alert Data May 27, 2010.pdf

We may get a report from the Minyon farm near Motley on Friday, but I may not get a chance to update this until Tuesday.

For more information about doing scissors cut sampling or using PEAQ sticks or charts, look in the center of the U of M Extension Forages web page at:
http://extension.umn.edu/forages

Monday, May 24, 2010

Alfalfa Harvest Alert Info in Central MN - May 24, 2010

By Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties

Updated on Wednesday Evening May 26
This is a report of information from fields sampled on Monday May 24 with a couple of updates from May 20. We have a lab report from Motley sample fields now.
Alfalfa Harvest Alert Data May 24, 2010.pdf

For more information about doing scissors cut sampling or using PEAQ sticks or charts, look in the center of the U of M Extension Forages web page at:
http://extension.umn.edu/forages

Thursday, May 20, 2010

Alfalfa Harvest Alert Info in Central MN - May 20, 2010

By  Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties

UPDATED Friday Evening May 21, 2010
We have more information back from May 20 sampling. Information is posted in this pdf document and will be updated here with a few more lab results on Monday if all goes well.
Alfalfa Harvest Alert Data May 20, 2010.pdf

For more information about doing scissors cut sampling or using PEAQ sticks or charts, look in the center of the U of M Extension Forages web page at:
http://extension.umn.edu/forages

Sauk Centre Hay Auction Results May 6 & 20, 2010

By Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties

I am posting here the grouped and averaged summary for the auction held at Sauk Centre on May 6 and May 20, 2010 ... and end of auction season summaries.

SC Hay Auction 05 06 10.pdf A list of all tested hay lots and bedding materials sold ... grouped by kind of hay and type of bale ... cost per pound of dry matter and cost per RFV point are calculated.

SC Hay Auction 05 20 10.pdf Hay by groups as described for May 6

Summary Selected Lots 2009-2010.pdf This is a summary of selected lots through the year including an average and ranges for these groups through the year.

Graph SC Hay Auction 2001-2010.pdf This is a line graph of the averages for medium square bales in 4 RFV groups completer through May 2010.


Monday, May 17, 2010

Alfalfa Harvest Alert Info in Central MN - May 17, 2010

By Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties

Updated May 19, 2010 ~ 5:30 p.m.
Some Harvest has started.

Report for field samples on Monday May 17:
Alfalfa Harvest Alert Data May 17, 2010.pdf


For more information about doing scissors cut sampling or using PEAQ sticks or charts, look in the center of the U of M Forages web page at:
http://www.extension.umn.edu/forages/

Friday, May 14, 2010

Corn Stand Evaluations

Dr. Jeff Coulter, Extension Corn Agronomist, and Bruce Potter, SW Minnesota IPM Specialist

An unfortunate weather event


The frost on the morning of May 9, 2010 has some corn growers and those who advise them a bit nervous. The frost damaged corn plants I looked at on Monday all had firm green tissue from the soil surface and below and should come through the frost well. The injury stopped at the soil line and after the recent rainfall the green tissue is now above the soil surface. The cold, wet weather since the frost has added another level of stress which, by itself, might reduce stands slightly. There is some potential for these two situations may create a situation favorable for stand reducing pathogens. Warmer weather is in the forecast and frost injured corn plants will begin shooting new leaves soon. In fact, many fields have recently begun to improve in appearance. An idea of the extent of stand loss, if any, should be visible by May 18. To avoid unnecessary wear and tear on your psyche, the remainder of the week and weekend should be spent on something relaxing. The fishing opener is one viable option.

Will Corn Seedling Diseases be More Common Than Usual This Year in Minnesota?

By Dean Malvick, Extension plant pathologist

Early planting and warm weather in April, followed by an extended period of cool, wet weather and frost in May has created stress for corn seedlings throughout much of Minnesota. As of May 9, 94% of the corn in Minnesota was planted and 32% had emerged (compared to the 5 year averages of 64% planted and 9% emerged). While the stress of the cool conditions and frost may only set back the corn slightly, it could also set up a situation for seedling disease in some areas. Keep in mind that many factors other than disease result in poor stands, reduced growth, and low vigor. In most years and in most fields, seedling diseases are a minor problem, but this year they may be more common than usual.

Thursday, May 13, 2010

Alfalfa Harvest Alert Info in Central MN - May 13, 2010

By Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties

UPDATED Monday Evening May 17

ALL test and field information for May 13 IS POSTED NOW in the document here:
Alfalfa Harvest Alert Data May 13, 2010.pdf

For more information about doing scissors cut sampling or using PEAQ sticks or charts look in the center of the U of M Extension forages web page at:
http://extension.umn.edu/forages

Monday, May 10, 2010

Alfalfa Harvest Alert in Central MN - May 10, 2010

By Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties

UPDATED May 13 Evening

THINGS HAVE NOT CHANGED MUCH SINCE LAST THURSDAY. This report shows information we have gotten so far from May 10 sampling and field observations. We expect lab reports from two sites yet. 

For more information about doing scissors cut sampling or using PEAQ sticks or charts look in the center of the U of M Extension forages web page at:
http://www.extension.umn.edu/forages
Click the link below to look at the data from May 10, 2010. See when some fields were at today's height in 2009. New May 10 information will be updated by edits to this entry.
Alfalfa Harvest Alert Data May 10, 2010.pdf

Thursday, May 6, 2010

Alfalfa Harvest Alert in Central MN - May 6, 2010

By Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties
UPDATED MAY 7 - 4:15 p.m.

This report shows Alfalfa Harvest Alert information from field observations and forage tests in Caver/Scott, McLeod/Meeker, Stearns/Benton/Morrison, and Wright Counties. It includes RFV & RFQ numbers on some samples and some notes related to samples.

For more information about doing scissors cut sampling or using PEAQ sticks or charts look in the center of the U of M Extension forages web page at:
http://www.extension.umn.edu/forages

Click the link below to look at the data from May 6, 2010. This information will be updated by edits to this entry. Most of these fields will be sampled on Monday and Thursday mornings until they are harvested. Crop height appears to be 1 to 2 weeks ahead of last year.
Alfalfa Harvest Alert Data May 6, 2010.pdf

Sunday, May 2, 2010

Alfalfa Harvest Alert Data - Central MN - May 3, 2010

By Dan Martens, Extension Educator, Stearns-Benton-Morrison Counties<

Updated May 5.
This report shows information from field observations and forage tests in Caver/Scott, Mcleod/Meeker,Stearns/Benton/Morrison, and Wright Counties. The Alfalfa Harvest Alert Project includes using forage lab tests and the PEAQ process for estimating forage quality as a gauge for making harvest decisions. PEAQ stands for Predictive Equation for Alfalfa Quality. It estimates what the forage test of a fresh cut sample might be based on the height of the tallest steam and the maturity of the most mature stem.

Saturday, May 1, 2010

Spring Frost Damage to Early-Planted Corn

By Jeff Coulter, Extension Corn Agronomist

Early-Planted Corn.jpg
Figure 1. Early-planted corn off to a vigorous start.

The unusually warm and dry spring has facilitated some of the earliest corn planting dates of all time in Minnesota, with an estimated 63 percent of the state's corn crop planted and 1% emerged by April 25. This early start to the growing season should allow the corn crop to pollinate and fill grain earlier than normal, hopefully under more favorable soil moisture levels. From 1966 to 2009 at the University of Minnesota Southwest Research and Outreach Center in Lamberton, plant-available soil water to a depth of five feet averaged 5.22 inches on July 15, compared to 4.32 inches on August 15. Early corn planting dates should also allow kernels to fill when day length is longer, reduce the risk of a fall freeze before crop maturity, and allow increased time for grain dry-down prior to harvest.
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