Indemnified Label Allows Dual Magnum Overtop of Summer Squash – Yellow and Zucchini (Culpepper)

Our new label allowing Dual Magnum over-the-top of emerged seeded and transplant squash grown on bare-ground or in a mulch system has been approved for use in Georgia.  The label should be self-explanatory….if not let me know as I was one of the authors.  

Getting Label: See steps below on obtaining the label (this information has been provided several times).

Grower Must Obtain His/her Label: For years we have stressed the importance of growers having a copy of our state local need (SLN) indemnified labels when making applications. This is getting more serious as the Department of Agriculture has started asking to see these labels doing routine visits; this is simply a response to the sheer volume of state local need labels we now have for Georgia growers.  To drive the point home here is an e-mail from GDA a few weeks ago “Dr. Culpepper, If you talk to any grower groups regarding any SLN approvals, please remind them that they must keep or present the SLN label for our inspectors during an audit or it is a label violation. Our inspectors find many individuals that cannot produce an SLN label during farm inspections.”

Thanks,

Eric Olsen

GDA”

OBTAINING LABELS FOR DUAL MAGNUM OR REFLEX:

Consider helping your growers by asking them to come in and visit with you to get their label. This is a great opportunity for young/new agents to obtain face time with our clientele!!

Agents MUST NOT give growers any indemnified label or make any verbal recommendations until the grower has the label.  Agents can help growers through the process but must make sure the grower clicks the “I ACCEPT” liability waver when obtaining the label.

Obtaining the label for First Time (first time takes a couple minutes, thereafter very simple):

1.  Go to www.farmassist.com

2.  Register the grower (or if you want a label register yourself); “register” is located on the 2nd tool bar in top middle of page.  After filling in information; click I accept at bottom.

3.  The next page that pops up asks about you; you do not have to fill this out if you do not want.

4.  Select products along top bar.

5.  Select indemnified labels (4^th one down).

6.  For state, select Georgia and for product, select Dual Magnum or Reflex (play around and see our other labels) and then submit.

7.  Select the Dual Magnum or Reflex crop of interest and submit.

8.  Accept waiver; this is the process making the label an indemnified label.  GROWER MUST CLICK THE  I ACCEPT KEY TO GET THEIR LABEL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

9.  Print label and have present during application.

Sweet Potatoes and Cadre (Culpepper and Prostko)

Over the last several years, many county agents have asked about carryover concerns of Cadre applied in a peanut crop to sweet potato the following season.  The Cadre label restricts planting potatoes to 40 months after a Cadre application but the label does not specifically mention sweet potato.  Many have wondered is it really this serious?

According to the 2014 edition of the WSSA's Herbicide Handbook (page 256), the half-life of Cadre or the time in which about half of the Cadre would be gone is approximately 120 days.  In theory then, a June application of Cadre at 4 oz/A in peanut should be down to a rate somewhere between ½-1 oz/A approximately 8-12 months later when one would plant sweet potato.  

During 2015, a study was conducted where we applied ½ and 1 oz/A of Cadre prior to transplanting sweet potato.  Cadre at ½ oz/A caused 55% visual injury (stunting and discoloration) and reduced U.S. Number 1 fruit yield by 59%.  For Cadre at 1 oz/A, sweet potato injury reached 77% and reduced U.S. Number 1 fruit by 96%.  Simply, applications of Cadre in peanut should be avoided if you plan to rotate to sweet potato!!!!!.

Quick Responses (Prostko)

Here are a few answers to some questions that I have been receiving over the last few weeks or so:

1) How long do I have to wait to plant field corn if I use 1 pt/A of 2,4-D amine in my pre-plant burndown?

I usually recommend that growers wait at least 7-10 days after an application of 2,4-D amine to plant field corn.  If they need to plant sooner than that, the 2,4-D should be replaced with atrazine (1 qt/A).  When atrazine is used in a pre-plant burndown, field corn can be planted immediately.  However, I would still prefer planting into dead stuff. 

2) How long do I have to wait to plant peanuts if I use 1 pt/A of 2,4-D amine in my pre-plant burndown.

UGA research has shown that peanut planting can occur 7 days after an application of 2,4-D amine.

3) When tank-mixing glyphosate with atrazine or other herbicides for POST applications in field corn, is an adjuvant still needed?

If the formulation of glyphosate is "loaded" (i.e. already contains surfactants) then additional adjuvants (NIS or COC) are not really needed and may increase potential crop injury. Rather than re-invent the wheel, my weed science colleagues at Penn State University have put together an up-to-date list of the different formulations of glyphosate.  Check out the following link:

http://extension.psu.edu/agronomy-guide/pm/tables/table-2-4-1a

Ammonium sulfate (AMS) should always be used with any glyphosate treatment in situations where hard water (higher amounts of Ca, K, Mg, Na, etc.) is a problem.  The AMS must be added to the spray tank before the glyphosate.

4) What are some potential causes of "white" or off-color field corn seedlings?

a) stress inhibiting chlorophyll accumulation (i.e. compaction, cold temperatures)
b) low temperature sunscald & cold banding (cool, clear dewy nights followed by sunny mornings)
c) genetics
d) herbicide injury (Halex GT, Capreno, Laudis, glyphosate, others?)

5) What is the potential for Strongarm carryover in field corn in Georgia?

a) The labeled rotation restriction for field corn is 18 months.
b) Research and experience over the past 17 years would suggest that the risk of Strongarm carryover (irrigated fields only) would be low.  However, I will never say never! It would not be a good idea to plant field corn in a dryland field where Strongarm was used in peanuts the previous year!
c) If you suspect herbicide carryover in early-season field corn, I would strongly suggest that you collect both a soil pH and nematode sample because both of these problems are much more common than herbicide carryover.  Soil pH and nematode problems cause corn injury symptoms that look very similar to herbicide injury.