Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Posts Tagged ‘peanut’

UGA Peanut Variety Update

Posted by romeethredge on February 23, 2015

Here’s some peanut variety information for 2015 from UGA Peanut Breeder, Dr. Bill Branch.

 

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Peanut Harvest

Posted by romeethredge on September 13, 2014

Peanut harvest is beginning very slowly this year. A few end rows and a few fields have been dug but very few so far. But that’s a good thing as farmers are waiting until the peak of maturity so they will get the best weight and grade from their peanuts. This also makes for the tastiest nuts and peanut butter.

Early peanuts were taking more days to mature but now we are seeing a slight speeding up of maturity on peanuts planted a little later, in some cases. There is a lot of variation in maturity so every field needs to be maturity tested so we get it as close to right as we can. Of course there are many factors to consider when planning to dig peanuts such as: age of the peanuts , vine strength, stem strength, variety, weather, manpower, equipment, soil moisture, maturity test results, and the list goes on.

Here’s a field of irrigated Ga O6G peanuts that were dug this week. You can tell it was a little wet when they were dug but they look good.

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Peanut Water Use – Critical Now

Posted by romeethredge on August 7, 2014

This first week of August (if the peanuts were planted by May 1), is the peak of the water use curve, requiring about 2 inches per week.  The good news is that we’re about to move past the peak water use period and start requiring slightly less water in the oldest fields.

If your peanuts were planted 2-4 weeks later they will move into the highest water use period soon.  Please see the figure below for the ranges of peanuts planted from late April (yellow) and peanuts planted in middle May (blue).

 

water use

 

Thanks to UGA Scientists, Wes Porter, Gary Hawkins and Calvin Perry for most of this info.

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Peanuts Progress

Posted by romeethredge on June 19, 2014

Peanuts are growing and we have some that are pegging. We are past most of the thrips problems but there are some caterpillars feeding on foliage but not much in a serious way that I’ve seen. There are some lessers around causing damage. Weed controls are going out in a big way.

Here are some pegging peanuts that were very early planted and look good.

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Here’s Ray Hunter with his young peanuts. They are growing well and his pre-emergent herbicide is working well.

 

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Peanut Leaf Scorch

Posted by romeethredge on June 12, 2014

Peanut Leaf Scorch is showing up, but is nothing to be concerned about.

 Leptosphaerulina crassiaca is the causal organism of Peanut Leaf Scorch. We’re seeing some of this now. This was in a field of Tiftguards variety peanuts that had Cruiser Max seed treatment, so we knew it was not Thimet burn.  Dr Bob Kemerait, UGA Extension Plant Pathologist, says it causes some leaf symptoms but does not cause yield loss in peanut. Our normal fungicides used in peanut probably help with this as well.

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Valor Herbicide Injury on Peanuts

Posted by romeethredge on May 20, 2014

Valor is a valuable herbicide that we use in the pigweed fight. It is also useful in controlling many other weeds such as Florida beggarweed. There has been some peanut injury caused by the herbicide Valor.  Peanut fields planted the week of May 5 that were hit by the heavy rains on May 14-15 are likely to have some level of injury .  Here are a few thoughts to consider by UGA Weed Scientist, Eric Prostko:

1) Valor injury should not be a surprise to anybody since this phenomenon has been observed for 13 years.  Cracking peanuts (+1-2 weeks) treated with Valor that receive heavy rainfall will be injured almost all the time!!!

2) There is a good amount of UGA data to suggest that, in most cases, the peanuts will recover from this injury without yield loss even at a 2X rate (i. e. 6 oz/A) (Tables 1 and 2).

3) Recent UGA research conducted by Drs. Jason Sarver and Scott Tubbs would suggest that there is no yield or economic benefit to replanting a peanut field if populations are at least 2.5 seed/ft (single row) or 3.0 seed/ft (twin row).  Thus, I would not worry too much about Valor injury unless plant populations fall below these levels (assuming the stand is uniform and not skippy).  

4) Contrary to older dogma, peanut j-rooting is not always caused by herbicides such as Dual or Warrant.  Today, I found numerous peanut plants in my untreated plots (i.e. no herbicides) that are exhibiting this symptom (Figure 2).  Many other factors can cause j-rooting including individual seedling vigor, environmental conditions (cold/wet), and soil compaction. 

Figure 1.  Valor Injury
Table 1.  Peanut Yield Response to Valor – 2009
Table 3.  Peanut Yield Response to Valor – 2013

 

Figure 2.  J-rooted peanuts not treated with any herbicide.

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New Peanut Herbicide

Posted by romeethredge on February 22, 2014

Warrant recently received both federal and state approvals for use on peanuts in Georgia. Here are a few of Dr. Eric Prostko’s, UGA Extension weed Scientist, thoughts regarding its potential use in 2014:

1) The current supplemental label only permits PRE and/or EPOST applications (before flowering).

2) Of these 2 timings, he would prefer to see EPOST applications of Warrant tank-mixed with Gramoxone + Storm + NIS.

3) At this point in time, Dr. Prostko has NOT observed any real differences in weed control between Dual Magnum and Warrant based peanut weed control programs . However, there is some data that suggests that Warrant might be a better choice for non-irrigated fields.

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Peanut Rust Showing Up – Late as Usual

Posted by romeethredge on September 13, 2013

Peanut rust is a late season problem that we see in most years in isolated areas. This year it may be worse than normal. I saw some this week and I talked to several others who have seen it. Crop Advisor Luke Johnson said a grower called saying he thought he had burned his peanuts with a spray but it turned out to be peanut rust. UGA Plant pathologists report that it is showing up across Georgia.  I’ve seen it be a problem where fungicides were used that don’t have much activity on it without cholorothalonil added in.

 

I have several photos here I took this week of the disease.

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Peanut Disease Low – Why?

Posted by romeethredge on August 7, 2013

Most of the peanut fields I have been in have good disease control. I’m not seeing a lot of disease out there even though we have seen a lot of rain. I think most folks have been serious about protecting the peanuts with fungicides. Also temperatures were lower and so the White mold didn’t get bad yet due to that. But we’ve had some hot days so it is likely coming. _DSC8546

Here’s a good report from Dr. Bob Kemerait concerning peanut disease.

Rainfall has been abundant throughout much of the 2013 peanut growing season and this has created the seemingly perfect conditions for disease in our crop.  Frequent rain events continue to pop up over much of the Coastal Plain continuing to keep the risk to disease high.

Despite my repeated and dire predictions for severe disease outbreaks this year in our peanut fields, the reports from county agents have been fairly quiet.  Although rainfall has been torrential and many farmers have not been able to get into the field to make timely fungicide applications, I know of very few situations where disease has overwhelmed a crop.  I believe there are at least four reasons to explain this.

First, I believe that we have the best fungicides that we have ever had for use on peanuts.  Despite the potential for significant outbreaks, our current fungicide programs have been very effective.  Second, because our peanut acreage is down this year, in all likelihood our growers have the opportunity to grow the crop on better rotated land.  Better crop rotation means lower risk to disease.  Third, there is no doubt that our current peanut varieties have improved disease resistance.  Although this resistance is not perfect, I believe it has helped to reduce the development of disease this season.  Finally, though the moisture from the rainfall is important for the development for disease, our frequent storms and torrential rains may have actually reduced the risk to white mold.  Hard to believe, but the rainfall patterns may have actually REDUCED our risk to white mold.  Why?  By keeping soil temperatures cooler and by potentially disrupting the optimal growth of the fungus (remember much of the white mold fungus is exposed in the canopy to the mechanical action of rainfall) the storms may have kept the incidence of our most important disease low.  However, our disease situation could change quickly.

Though the incidence of leaf spot, white mold, Rhizoctonia limb rot, and CBR is low in many fields, we could see and explosion of disease in August, especially if rain continues but the temperatures rise to the upper 90’s.  Vine growth is abundant in many fields; with moisture and higher temperatures we can expect to see significant outbreaks of white mold, leaf spot, and Rhizoctonia limb rot.  For this reason, growers are advised to stay on very aggressive fungicide programs.  “Aggressive fungicide programs include the use of our best fungicides and also staying on time with the application of the fungicides.

Lastly, August is likely to bring greater development of tomato spotted wilt and also Cylindrocladium black rot (CBR).  The cooler and wetter conditions that have defined 2013 have not been optimal for white mold but they do favor CBR.  As the crop develops and is stressed by an increasing pod load, I believe that plants already infected with CBR and TSWV will become increasingly evident in the field.  There is nothing now that can be done to manage TSWV; however sticking with a fungicide program that includes Provost, Abound, and perhaps Fontelis may help to reduce the severity of CBR.

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Peanut Herbicides Use

Posted by romeethredge on June 12, 2013

Weed control in peanuts with Cadre herbicide is almost always better following an EPOST (cracking) application of paraquat (Figure 1).

UGA Extension Scientist Eric Prostko, says that growers should only consider not using a cracking treatment of paraquat (+ Basagran or Storm) if weather conditions have prevented a timely application (< 28 days after peanut emergence) and/or when there is not enough weed growth to justify the application (i.e. no weeds).

Posted in Peanuts, Weeds | Tagged: , | 3 Comments »

 
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