Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Archive for June, 2011

Killing Pigweed with Ignite

Posted by romeethredge on June 30, 2011

Ignite herbicide can kill pigweeds. We’re having trouble killing resistant pigweeds and we’re fortunate to have Ignite as something else in our arsenal to control emerged pigweed. It can only be used on certain varieties however.  In the photo below are Rob Millings, Keith Rucker and Eddie Hatcher with Bayer Cropsciences looking at a dead pigweed in some Fibermax Liberty Link Cotton treated with Ignite.

Here’s some info from Dr Stanley Culpepper, UGA Extension Crop Scientist, concerning Ignite use.

Weed Management in Liberty Link Cotton

Liberty Link refers to transgenic cotton resistant to the herbicide glufosinate, which is sold under the trade
name Ignite 280.

Timing of Application

Liberty Link cotton has excellent tolerance of Ignite 280. Ignite can be applied overtop of Liberty Link cotton
from emergence until the early bloom stage without concern over injury or fruit
shed. On cotton larger than about 10 inches, a semi-directed application may be
preferred in order to obtain better coverage on weeds under the cotton canopy.

The optimum weed size for treatment with Ignite 280 varies, depending on the weed species and growing conditions.
Pigweed species, Palmer amaranth, tropic croton, spurred anoda, velvetleaf, Florida
beggarweed, eclipta, groundcherry, spotted spurge, common purslane, and annual
grasses should be no more than 3 inches tall. Goosegrass should be 2 inches or less. Under dry or other stressful
conditions, Palmer amaranth and all annual grasses should be 2 inches or smaller when treated.

 Application Equipment

Ignite 280 behaves much like a contact
herbicide. Hence, good spray coverage is necessary. The label recommends
flat-fan nozzles, 30 to 60 psi, and a minimum of 15 gallons per acre spray volume.
Drift-reducing nozzles, such as air-induction nozzles that are commonly used to
apply glyphosate, are not appropriate for Ignite 280 applications.
Drift-reducing nozzles produce large droplets which may not give adequate spray
coverage for a contact herbicide.

Systems in Phytogen WideStrike Cotton

Cotton designated as Widestrike
contains two transformation events that express two deltaendotoxins which
confer resistance to lepidopteran pests. Both of these events also contain the phosphinothricin
acetyltransferase (pat) gene which was inserted for use as a selectable
marker during plant transformation. The pat gene confers resistance to

Tolerance of varieties with the
WideStrike trait to Ignite (glufosinate) is not complete. In contrast to
LibertyLink cotton, which is higly tolerant to Ignite, some injury will occur
when Ignite is applied to WideStrike cotton. The injury is most often leaf
burn, and can range from very minor to rather significant. Research in Georgia
has not shown significant yield reduction of WideStrike cotton from two Ignite
applications at 29 fl oz applied twice at 1- to 3-leaf cotton and again at 5- to
7-leaf cotton. Rates in excess of 29 fl oz should not be applied, and ammonium
sulfate or any other adjuvants should not be included. Additionally, it is critical that applications after 8 leaf be avoided
as yield loss will likely occur
from applications near bloom.

Most Phytogen varieties with the
WideStrike trait also contain the Roundup Ready Flex trait. Hence, Ignite and
glyphosate can be applied to these varieties. However, tank mixing Ignite and glyphosate
is not recommended. Glyphosate does not impact the activity of Ignite, but
Ignite can antagonize glyphosate.

According to the recent EPA
interpretation, Ignite 280 herbicide can be applied to WideStrike cotton.
However, the grower is liable for any crop injury resulting from the
application. Neither Bayer Crop Science nor Dow AgroSciences/PhytoGen recommend
or warrant the use of Ignite on WideStrike cotton.

Posted in Cotton, Crops, Uncategorized, Weeds | Tagged: , , | Leave a Comment »

Cotton Sidedress Time is Here

Posted by romeethredge on June 30, 2011

Time to sidedress cotton to get top yields is here on lots of our cotton.

Alex and Kayleigh Johnson are spreading sidedress fertilizer on this squaring cotton in southern Seminole County this week. Here below they’re checking the spinners and the gates on the fertilizer spreader.

Here’s some comments from Dr Glen Harris, UGA Extension Crop Scientist.  The total N rate should always be applied in split applications. Apply 1/4 to 1/3 of the recommended N at planting and the remainder at sidedress. The preplant or at planting Napplication is critical for getting the crop off to a good start and ensuring adequate N nutritionprior to side-dressing.

Sidedress N between first square and first bloom depending on growth and color (toward first square if slow growing and pale green, toward first bloom if rapid growth and dark green). A portion of the sidedress N can also be applied as foliar treatments or through irrigation systems.

There are a number of nitrogen fertilizer materials that can be used on cotton including UAN solutions, ammonium nitrate and urea. UAN solutions are made up of urea and ammonium nitrate and often contain sulfur (e.g. 28-0-0-5). Ammonium nitrate is losing favor as a sidedres sN source for cotton due to higher cost and burn potential. Urea is being considered as an alternative to ammonium nitrate but is known to be prone to volatilization losses. Volatilization losses can be minimized however by irrigating after a urea application or by use of a urease inhibitor such as Agrotain. Feed grade urea is still the product of choice for foliar N applicationslater in the growing season. Controlled release nitrogen foliar products are also available but usually contain potassium and boron and are less concentrated in N.

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

Feral Hog Control

Posted by romeethredge on June 30, 2011


Mississippi State feral pig site has a brand new publication
specifically geared towards landowners looking for options.  It gets into
a lot more detail about various trap designs and additional methodology.
Great publication.

Here’s another publication about it.

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

Hooded Sprayer Use in Cotton

Posted by romeethredge on June 24, 2011

Lots of new Hooded Sprayers are around for use in cotton fields so we can do a better job controlling pigweeds. Here’s Clint Mims covering some ground with this hooded sprayer. He’s spraying under the hood with a good mix of herbicides and directing another set of chemistries at the base of the cotton plant for optimal weed control and residual. Here’s a link to a video of the hooded sprayer going through the field

Some reminders:  Go slow, keep hood tight on ground, keep pressure low under hood (under 25 psi) , turn spray off before raising hood (Don’t laugh, it’s been done), after turning off spray , keep hoods on ground for a little bit, just a little hesitation before raising hood helps.

See above where a hooded sprayer using paraquat sprayed end rows, and killed some cotton in the cross rows. Other cotton in the field was not affected and weed coverage looked good.

This chart is in the 2011 UGA Cotton Production Guide, here’s a link to it.

How To Set Up A Post-Emergence Directed and Shielded Herbicide Sprayer for Cotton

Paul E. Sumner, Biological and Agricultural Engineering
Stanley Culpepper, Crop and Soil Sciences

This publication is at the following link:

Posted in Agriculture, Cotton, Crops, Uncategorized, Weeds | Tagged: , , | Leave a Comment »

Peanuts Podding

Posted by romeethredge on June 23, 2011

Here’s some older, irrigated, podding peanuts.

Peanut Disease

UGA Extension Plant Pathologist Bob Kemerait says, “Because white mold has been observed and the hot conditions are favorable for early
outbreaks of white mold (especially underground white mold), growers across the
state should be prepared to begin their white mold program earlier this year
(perhaps as early as 45 days after planting).”

I’ve not seen any white mold as of yet but I’ve seen a little Tomato Spotted Wilt Virus (TSWV) as in this photo taken this week.



Posted in Agriculture, Crops, Peanuts, Plant Pathology, Uncategorized | Tagged: , , , | Leave a Comment »

Question Of The Week

Posted by romeethredge on June 23, 2011

Last week I asked what type of tracks were in the photo and I had one smart guy say they were truck tracks, and yes there was a tire track in the photo but I was asking about the animal tracks. They were turtle tracks, most likely Gopher tortoise tracks crossing the sandy field road.   This week I’d like to know what is the problem with the cotton in the photo. Is it the new variegated cotton?




Posted in Cotton, Uncategorized | Tagged: , | 1 Comment »

Watering Corn

Posted by romeethredge on June 21, 2011

We’ve got to keep corn wet even though we’re getting in the short rows. I’ve been looking at some corn that is beginning to dent.





























So on that corn we have a couple more weeks to water it before black layer formation. Some folks have been asking me about decreasing the amount of irigation but we can’t cut it much. According to the Georgia Corn Production Guide, corn uses 2.4 inches per week during milk and dough stages and then at early dent decreases to 2.1 inches per week and then 1.9 inches per week until it’s made (black layer formation). So we really still need close to 2 inches per week all the way through.

Here’s our corn water use curve, and you can see that it doesn’t really curve very sharply.



Other Corn News

 Pioneer Summer Field days are coming up and our nearest one will be in Brinson, Ga. Let me know if you need info on the other locations and times.

Our Field days will be fast paced and informative. Each Field day has thenewest Pioneer Leader Hybrids and the latest seed technologies for Grain and
Silage production.  A meal will be provided at each location.

Wednesday July 6th at 5 pm at Glenn Heard Shop on Hwy 310 in Brinson, Ga.

Posted in Agriculture, Corn, Crops, Uncategorized, Water | Tagged: , | Leave a Comment »

Peanut Herbicide Drift

Posted by romeethredge on June 21, 2011

We’ve started using more Ignite on cotton varieties tolerant to it, and it works well if you follow the specific ways of using it. One more thing to watch for is drift onto peanuts. We can’t let it get on peanuts or we’ll see big yield losses. See photo below of where some Ignite drifted onto these peanuts 10 days ago. As you can see from Dr. Prostko’s chart below , you can loose a third of your peanut yield by getting a third rate (8 ozs) of Ignite on your peanuts.

Dr Eric Prostko, UGA Extension Scientist, gives us the info below on figuring losses.

Peanut Response to Ignite Ignite (glufosinate) has become an extremely popular
herbicide in Georgia due to our troubles with herbicide-resistant Palmer
amaranth. Peanuts are very sensitive to Ignite. Consequently, I expect
to see more problems in peanuts with off-target movement (drift) and sprayer
contamination. As little as 2 oz/A of Ignite can reduce peanut yields from 6
to 19% depending upon the time of application. Thus, Ignite drift and sprayer
contamination must be avoided. The following table provides an estimate of
peanut yield losses from various rates of Ignite applied at 30, 60, and 90
days after planting. Table 1. Estimated Peanut (GA-06G) Yield Losses (%) from
Ignite 2.34SL.1

Ignite Rate/A

Time of Application (DAP2)









































1Based upon data
from 2 field trials conducted in 2010 (Ponder Farm, Plains). 2DAP = days
after planting.

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

Southern Rust found Just South

Posted by romeethredge on June 13, 2011

Southern Corn Rust Found Just South of Georgia

Dr. Bob Kemerait, UGA Extension Plant Pathologist

The very hot and dry weather remains generally unfavorable for the development and spread of northern corn leaf blight; this disease has only been
reported sporadically in Georgia in 2011 and usually has been found in
irrigated fields in corn behind corn.  Though southern corn rust thrives
in warm/hot weather, the disease is generally more of a problem when there is
both hot weather and more abundant rainfall.  Obviously most of us
are short on rainfall this season.  To date, southern corn rust has not
been found in Georgia.  HOWEVER, Kevin
Phillips with Pioneer Seed brought a sample to the UGA Disease Diagnostic
Lab in Tifton thursday, June9th that was confirmed by Jason Brock as southern corn rust.  The leafsample was collected in Jefferson County FLORIDA two miles south of the Florida-Georgia line from Brooks County.
The incidence of southern rust was very low in the field, which is heavily

Based upon this find close to the Georgia border near Brooks County, it
is advisable that growers with irrigated corn in the deep south of Georgia
continue careful scouting of their fields for southern rust and northern
corn leaf blight.  Because conditions are so hot and dry, I am not
recommending that every grower with irrigated corn in the deep south of the
state apply fungicides as the crop reaches tasseling.  Fungicides are not
needed in every irrigated field at this time.  HOWEVER, with this find in
north Florida, corn growers in Lowndes, Brooks, Thomas, Grady, Decatur,
Seminole, Cook, Colquitt, Mitchell, Baker, Miller, and Early should be on
the lookout for the disease.  Additionally, those growers who are
most risk-adverse in the region should recognize that the risk of southern rust
has increased with this find.  What remains unknown is the extent to
which southern corn rust will develop and spread this season.

Note from Rome: I was in numerous fields the past few days and have not found any southern rust yet here in Seminole County.  It’s likely just a matter of time with the find in North Florida and the windy storms weve been having to move it north.  Also, Stink bug numbers are low in most fields.

Posted in Agriculture, Corn, Plant Pathology | Tagged: , , | Leave a Comment »

Cotton a Mixed Bag, some recovering,

Posted by romeethredge on June 10, 2011

Cotton is looking better this week but some replanting continues.  Below photo shows some weak cotton that is putting on new roots and hopefully is getting past some stress and will get on the right track. But not without lots of water to keep it going to this point after early season stress.

This cotton below is squaring well and looks good, you can see the speckling from residual herbicides to keep pigweed from emerging.

We got to keep it wet to keep it growing. Before bloom cotton will use about an inch of water a week.  Even then, you don’t want it to wilt before noon so more may be needed..




Rome Ethredge

Seminole County Extension Agent

Posted in Agriculture, Cotton, Crops, Uncategorized, Water | Tagged: , | Leave a Comment »

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