{"id":4360,"date":"2022-04-15T13:34:36","date_gmt":"2022-04-15T17:34:36","guid":{"rendered":"https:\/\/site.extension.uga.edu\/colquittag\/?p=4360"},"modified":"2022-04-15T16:12:36","modified_gmt":"2022-04-15T20:12:36","slug":"colquitt-county-ag-update-4-15-22","status":"publish","type":"post","link":"https:\/\/site.extension.uga.edu\/colquittag\/2022\/04\/colquitt-county-ag-update-4-15-22\/","title":{"rendered":"Colquitt County Ag Update 4\/15\/22"},"content":{"rendered":"\n

Current Situation:  <\/strong>Corn crop ranges from just planted to V4.  Corn has had a rough time due to the cold weather and wind over the last couple of weeks.  Wheat crop ranges from early heading (Feekes 10.3) to full flowering growth stage. Field conditions are becoming dry enough to apply fertilizer, burndown herbicides as we prepare for the upcoming season. <\/p>\n\n\n\n

Below is the weather summary from the UGA Weather Station at the Sunbelt Ag Expo for the period of April 8-14, 2022.  The 2 inch soil temperature ranges from 60.6 to 70.2 degrees for this period of time.    <\/p>\n\n\n\n

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Corn:  <\/strong>The corn crop ranges from just planted to just planted to V4 and a lot of fields are struggling due to nutrient deficiency or other issues. <\/p>\n\n\n\n

Dr. Dewey Lee discusses some points about the current corn situation. “Rain, cold weather frustrating corn progress” His blog post is here. <\/a><\/p>\n\n\n\n

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V3-V4 Stage Corn in Colquitt County, April 2022<\/figcaption><\/figure>\n\n\n\n

How do I take a tissue sample in corn? <\/em><\/p>\n\n\n\n

Plant tissue sampling should be used in tandem with soil sampling to determine:<\/p>\n\n\n\n

(1) If essential elements are presently low, adequate or excessive in the plant and;<\/p>\n\n\n\n

(2) Whether the proper ratio of certain elements exists.<\/p>\n\n\n\n

It is advisable to take plant tissue samples throughout the growing season to monitor nutrient status and detect any deficiencies or imbalances. If a deficiency or imbalance is detected early enough, it can usually be corrected in time to improve yield.<\/p>\n\n\n\n

In corn there are 3 good opportunities to do tissue analysis.<\/p>\n\n\n\n

1. Seedling stage (all of the above ground corn) 15-20 plants<\/p>\n\n\n\n

2. Prior to tasselling (the first fully developed leaf just below the whorl) 15-20 leaves<\/p>\n\n\n\n

3. From tasselling and shooting to silking (the entire leaf at the ear node or immediately above or below) 15-20 leaves<\/p>\n\n\n\n

If you have questions about tissue or soil sampling please contact your local county agent.<\/p>\n\n\n\n

Volunteer Peanut Control in Field Corn (Prostko)<\/strong><\/p>\n\n\n\n

Been getting a few calls about controlling volunteer peanuts in field corn.  Remember that the volunteer peanuts that emerge from seeds that made it thru the winter and rains are some super tough plants.  A couple of thoughts:

Roundup Ready Corn<\/em><\/strong>:  Split applications of glyphosate at least 10 days apart.  Glyphosate can be applied over-the-top of field corn up to V8 stage or 30″ whichever comes first.  Drop nozzles or lay-by applicator should be used when corn is 30″ to 48″ tall.

Liberty-Link Corn:<\/em><\/strong> Split applications of Liberty (glufosinate) at least 7 days apart.  Liberty can be applied over-the-top up to V6 stage of growth.  For corn 24″ to 36″ tall, apply with drop nozzles or lay-by rig.

Conventional Corn:<\/em><\/strong>  Split applications of dicamba @ 0.25 lb ae\/A applied EPOST (8″ tall corn) + lay-by (up to 36″ tall corn).  These dicamba applications must be separated by at least 14 days.   An alternative treatment would be dicamba (EPOST) followed by Evik (lay-by).

**Atrazine can also be included in any of these EPOST applications as long as corn is < 12″ tall.<\/p>\n\n\n\n

Wheat Stem Maggot<\/strong><\/p>\n\n\n\n

According to Rome Ethredge, retired County Agent, there are at least 3 reasons why we are seeing some white wheat grain heads in the field this week : insects, freeze damage, fusarium head blight. Yesterday (April 14, 2022) I noticed a few white heads in area wheat fields in Colquitt County. As it turns out it is Wheat Stem Maggot. Cody Bowling, Seminole County Agent, also reported this insect in Seminole County and he helped identify it. The bleaching head were caused by insect feeding on the stem, cutting off photosynthate and nutrient and water access to the head and it turns white. Wheat Stem maggots lay the eggs and hatch into the larva or maggot, since it\u2019s a fly, that would feed into the stem. Wheat stem maggot feeding occurs just above a plant node and they rarely cause economic yield loss. <\/p>\n\n\n\n

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Wheat Stem Maggot damage in Colquitt County, 2022<\/figcaption><\/figure>\n\n\n\n
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Wheat Stem Maggot Damage, Colquitt County, April 2022<\/figcaption><\/figure>\n\n\n\n

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More on Wheat diseases<\/strong><\/p>\n\n\n\n

Dr. Alfredo Martinez, UGA Plant Pathology and I have been getting questions about timing of Fusarium fungicide spray and it is important to spray while the wheat is flowering<\/strong> which occurs not long after heading but requires checking the field. You can see the anthers coming out in the below photo from Purdue University. Dr Martinez has the fungicides and rates in the pest management handbook and these fungicides are also effective on Leaf rust as well.<\/p>\n\n\n\n

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Tips on Managing Seedling Disease In Cotton<\/strong><\/p>\n\n\n\n

I have received a question or two about managing cotton seedling disease.  Below are a few points to consider from the UGA Cotton Production Guide.<\/p>\n\n\n\n

Good management practices to reduce the chance of seedling disease include the following:<\/strong><\/p>\n\n\n\n