Arkansas Rice: Very Little Planting Progress

    Photo: Clay Gibson, University of Arkansas

    So close, and yet so far away.  Very little progress to speak of yet again this week after more rainfall events.  As usual, amounts were variable depending on where you were, but everyone received a share.  By Thursday a few lucky spots were able to return to the field, but most are just now drying up into the weekend with a very wet upcoming forecast starting Monday.  I even saw a drill running in some spitting rain today.

    This past Monday we were only reported to be 2% planted so far, and it’s unlikely that the upcoming report will reach even 5% planted.  Over the past 5 years, we would be 20-25% planted by this point in the year.  Considering some of the recent years that are included in that average, you could argue that we’re overall way behind.

    Sorry, I hope you didn’t start reading this expecting a lot of good news since I haven’t given any.  One bright point to spotlight is that even though in recent years we’ve tended to plant rice later than we want, our yields have clearly been doing very well.  So ultimately let’s hope that the weather is once again pushing us into an optimum window for making solid yields whether we know it yet or not.

    Update on AV-1011 Bird Repellent

    This week, the EPA announced that anthraquinone, the active ingredient in AV-1011 used as a seed treatment bird repellent in rice, is under registration review.  As part of this review, it was found that detectable levels of anthraquinone may be present in harvested rice grain.  There is currently no tolerance limit set for anthraquinone in harvested rice grain, so additional data is needed from the registrant to fill this data gap.  This data is not expected to be available until 2024 at the earliest.

    AgFax Weed Solutions

    In the immediate, there is not a defined impact to rice growers using AV-1011 in rice – “… EPA has concluded there are no resulting risks of concern from the consumption of rice commodities that could enter or are already available from the channels of trade.”  Because EPA does not consider dietary exposure to anthraquinone a safety concern, FDA does not intend to start routine testing on rice from this year’s harvest or past harvests.

    However, FDA is planning to incorporate anthraquinone as an analyte in the quantitative multi-residue method used by the Pesticide Residue Monitoring Program in the future once EPA’s registration review process is complete (~2024) and may take regulatory action if violative anthraquinone residues are found.  For general information about how FDA enforces pesticide tolerances, visit the FDA Center for Food Safety and Applied Nutrition (CFSAN) pesticides webpage.

    At this time, it is my understanding that there is not an issue with the use of AV-1011 (anthraquinone) in rice for 2022.  However, this could change in upcoming seasons once the EPA’s registration review process is complete.

    The complete statement is available here.  EPA plans to issue a Data Call-In (DCI) this month for the data needed to establish a tolerance, and welcomes comments on the draft risk assessments for anthraquinone over the next 60 days (here).

    Herbicide Plant-Back Restrictions

    Acres continue to shuffle from one commodity to another at a rapid rate, and upcoming additional rainfall will likely continue that trend.  With that going on, we’re already hearing of numerous potential mistakes related to plant-back intervals.

    First off, remember that for our burndown herbicides, some can cause us problems in rice if we don’t adhere to the plant-back interval.  Some notable intervals are included in Table 1.  This information is also available in the 2022 Rice Management Guide.

    Table 1.  Notable burn-down herbicides with plant-back intervals to rice.

    Herbicide Plant-Back Interval for Rice
    2,4-D 21 days
    Dicamba1 22 days
    Elevore 14 days
    Goal 10 months
    LeadOff 10 months
    Metribuzin 8 months
    Python 6 months
    Select Max 30 days
    Valor / Afforia 30 days
    Zidua SC (3.25 oz) 12 months

    1 Plant-back days are rate dependent, days presented are for lowest labeled rate.

    Aside from just rice and burndown herbicides, remember some of the more restrictive plant-back intervals for herbicides we use in-crop that limit our rotational options the following year.  One example would be planting corn behind Clearfield or FullPage rice – for Newpath/Preface use rates greater than 8 oz/A per season, only soybeans may be planted the following year.  There are other examples, that’s just one that’s come up recently.  Additional information on most common herbicides is available in the MP519 Row Crop Plant-Back Intervals for Common Herbicides.

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