Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Peanut Weeds

Posted by romeethredge on July 1, 2015

Dr. Eric Prostko, UGA extension weed scientist, gives a good Peanut weed control update, below.

1) Cobra or Ultra Blazer applications should be avoided if possible when the peanut plants are in the R5 (beginning seed) to R6 (full seed) stage of growth (Figure 1).   Results from a 9 location study conducted in 2005-2006 indicated that Cobra applied at this time could cause a significant peanut yield loss (~5%).

Figure 1. Peanut Stages of Growth.

2) Nearly all 2,4-DB labels limit the official number of applications that can be made in peanut to 2.  Results from trials conducted in 1997 indicated that peanut plants (Florunner and GK-7) were tolerant of multiple applications (1, 2, or 3) of 2,4-DB.  Research is currently underway in 2015 to confirm these older results using GA-06G.  Check out Figure 2 for a list of how much and when 2,4-DB can be applied according to current labels.

Figure 2.  Summary of 2,4-DB labels for use in peanuts.

3) On more than 1 occasion this year, growers have accidently applied 2,4-D amine rather than 2,4-DB to peanut plants.  Fortunately, we have a good idea what could happen to peanut yields when this occurs (not that bad depending upon rate and peanut stage of growth).  Check out the following UGA Extension publication:

http://extension.uga.edu/publications/files/pdf/C%201036_1.PDF

“Not a rocket scientist for sure but I am thinking that is a great idea to read and check the label (or at least look at it) of any pesticide jug before dumping it into a spray tank.  As my father once told me, fast and ready sets the pace but slow and steady wins the race!”

Posted in Peanuts, Weeds | Tagged: , | Leave a Comment »

Morninglory ID

Posted by romeethredge on June 30, 2015

Morninglories can be hard to control and hard to identify. Identification is important so that you can use the right chemical to control them.  Probably the most important thing is to be able to tell Smallflower morninglory from the other types.

Dr. Eric Prostko, UGA Extension Scientist, recently provided some insight into morninglories.

Here is an old chart that can be useful in identifying morninglories.

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Figure 1.  Identifying Morningglory Species.  Source: Dr. Dick Oliver, University of Arkansas,  Weeds Today

  Some very good close-up pictures of seedling morningglory plants.  Pictures are from LSU and Virgina Tech.

Smallflower Morninglory in Bloom_DSC9058

Why is this important?  Not all morningglories are controlled equally by certain herbicides. Here are a few examples:

a) Gramoxone (paraquat) is generally good on most morningglory species but not smallflower.

b) Basagran (bentazon) is generally not effective on most morningglory species but will control smallflower.

c) Staple (pyrithiobac) is generally considered to be an excellent morningglory herbicide but not on tall. d) 2,4-DB is less effective on pitted morninglory than other species.

e) Aim (carfentrazone) is considered a good morningglory herbicide but not on smallflower.

Also, in cotton, Envoke is good on most morninglories but not Smallflower.

Posted in Weeds | 1 Comment »

Potato Leafhoppers in Peanut

Posted by romeethredge on June 26, 2015

Potato leafhoppers, not to be confused with Three cornered alfalfa hoppers. sometimes cause leaf damage in peanuts. They feed on the leaf and cause the V shaped yellowing.  A treatable situation has been reported in our area. They usually start on a field border and go out into the field in an area, so good scouting is needed to spot them.

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Here’s Dr. Mark Abney’s, UGA Extension Entomologist, report about them.

“As I walked through my test plots and a few commercial peanut fields this week I noticed that we are starting to see some potato leafhoppers and very early hopper burn. Also there was some heavy leafhopper pressure in at least one field in southwest GA this week. We need to be observant as we scout fields in the coming weeks. Low level leafhopper infestations are very easily overlooked, and scouting from the truck will almost guarantee that you will not see them until the hopper burn is bad.

Hopper burn will appear as yellowing of the tips of the leaves. This yellowing can be very dramatic when infestations are heavy. It is worth mentioning that hopper burn will not immediately go away once the insects stop feeding. This means you should confirm that potato leafhoppers are still active in a field with hopper burn before making an insecticide application. Scouts should be aware that leafhopper infestations often begin at the edges of fields and spread from there. Be sure not to overlook edges as you walk your fields.Potato leafhopper adult.

There are no validated economic thresholds for potato leafhoppers. The presence of adults and nymphs in the field means that reproduction is happening, and populations are likely to grow. We do not want to be too aggressive with this pest, especially in hot dry conditions where insecticide sprays could trigger secondary pest outbreaks. Nevertheless, we do want to prevent severe hopper burn.”

 See Dr. Abney’s post on 27 May 2015 for more info.

Hopper burn on peanut caused by potato leafhopper.

Posted in Entomology, Peanuts | Tagged: , | Leave a Comment »

Peanut Growth Stages

Posted by romeethredge on June 26, 2015

We often talk growth stages in crops but in peanuts we don’t very much.  We say they’re blooming or pegging or putting on pods. Here are the “official” reproductive stages in peanut. This will be good so we can talk a little more precisely to know where we are agronomically in peanut growth and development.

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Soybean Newsletter

Posted by romeethredge on June 26, 2015

The Georgia Soybean News is a good update from our Commodity commission for Soybean. We need our commodity commissions and they all do very good work to promote our crops. Click the link here to read the full report.

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Posted in Agriculture, Soybeans | Tagged: | Leave a Comment »

Cotton Squaring – Plant Bugs

Posted by romeethredge on June 19, 2015

Lots of our cotton is squaring well now but something is feeding on and blasting our squares in many fields.

I spoke with consultant Wes Briggs and he says square retention counts are down and the problem is plant bugs taking them out, so many fields have had to be sprayed for this pest.

Here’s a healthy square._DSC2673 _DSC2671 _DSC2668

Posted in Cotton, Entomology | Tagged: , | Leave a Comment »

Pigweed now a Nursery?

Posted by romeethredge on June 19, 2015

No extra charge for this blog post concerning racoons in a pigweed plant.

I guess pigweed is good for something, a racoon nursery. Farmer Micheal Thompson was out pulling pigweed in peanuts and come upon this sight, two baby racoons hanging on.

If we could just train them to pull up pigweed……

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Posted in Weeds, Wildlife | Tagged: , | Leave a Comment »

Peanuts

Posted by romeethredge on June 19, 2015

Peanuts that are older are pegging and some are producing pods.  Here are some Ga 06G’s  that I photographed yesterday that are over 70 days old. They need a lot of moisture now. Most of our peanuts are not this far along but they still need some rain or irrigation to keep them growing.

Here are some comments from Dr. Scott Monfort, UGA Peanut Scientist about our current situation,

“We have a large portion of our peanut acres in the 30 to 45 DAY range with soil moisture diminishing quickly due to the heat. Although peanuts do not typically need a lot of  moisture in the beginning of the season, they do not need to go through a drought stress.

Under the current weather pattern (Extremely Hot and Scattered showers), growers need to apply at least ½ to ¾ inch of water to maintain moisture in the soil profile and to keep the peanut crop moving forward.  We do not need to get behind.   Also we encourage all growers to scout their fields and keep ahead of any weed, insect, and/or disease problems that develop. “

 

 

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Posted in irrigation, Peanuts | Tagged: , | Leave a Comment »

Question of the Week – Goatspur

Posted by romeethredge on June 19, 2015

Last week I had a photo of weed seed. It was from Goatspur or Bristly Starbur among other names, Goathead, etc. It is not as serious a weed problem as it once was but is still a concern in rowcrops.

 

 

This week’s question is about a fish. Can you identify this fish I caught in Spring Creek this morning? Is it good to eat?

It was hot that I swam with the fishes a good bit.

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Posted in Weeds, Wildlife | Tagged: , | 1 Comment »

Corn Still Needs Water

Posted by romeethredge on June 19, 2015

We are getting fairly close to the end of the watering of our oldest corn, it has begun denting, but the water use is still pretty high.  With the heat and winds, the water use is especially high.

In looking at some soil moisture graphs we can see that the corn is still pulling moisture from the field. A good thing about soil moisture monitoring is that you can see the soil moisture increase as the crop slows down on its water use. I looked at a couple of graphs this week and they show continued use by the crop. You can see soil water replenish with irrigation or rainfall and see how it goes down quickly. In some cases it’s hard to keep up.  Sometimes it’s deeper that you see the moisture leaving, in other words the surface may seem wet. It’s good to get a shovel to check moisture deeper as well.

Here they are below. They are from client graphs of Certified Ag Resources and Holder Ag Consulting.

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Posted in Corn, irrigation, Water | Tagged: , | Leave a Comment »

 
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