Agfax Buzz:
    July 3, 2014
    Rice fields underwater due to excessive rainfall in Hunter, AR.

    Arkansas Rice: “Underwater” Diseases

    AgFax.Com - Your Online Ag News Source

    By Yeshi Wamishe, University of Arkansas Extension Rice Plant Pathologist

    Rice fields in some counties are “underwater “due to the excessive rain in the last days of June. As I drove (07/02/14) in Monroe, Woodruff, and St. Francis Counties, I saw fields of soybean and rice covered with water. Information on soybean conditions has been given here. Though not as fast as soybeans, rice in an “underwater “situation could also die unless it possesses specialized genes that enable it to breathe.

    The rice cultivars we grow here currently do not have those genes to my knowledge. However, as rice is more resilient under excessive water, I would like to speculate the possible disease related problems that may be associated.

     

    Although rice leaf blast has been on the go in the last two weeks, the fungus that causes rice blast does not like anaerobic conditions. Therefore, the disease would be suppressed and momentarily, it will not be a problem in these fields.

    Autumn decline that makes roots black and causes root rotting is a phenomenon that worsens in anaerobic conditions. Therefore, the excessive water could aggravate the problem more in fields with history.

    Rice fields underwater due to excessive rainfall in Hunter, AR.

    Image from University of Arkansas Rice fields underwater due to excessive rainfall in Hunter, AR.

    The fungus that cause sheath blight in rice is ubiquitous and may take chance to reach to the upper canopy faster than normal since the fungus structures that start infection normally float on flood water. Infection could start at any water level in the height of the crop. Therefore, it is likely to detect sheath blight lesions at the upper leaves and sheath after the flood subsides. Note that the upper three leaves including the flag leaf are very important for yield and quality of rice grain and they should be protected.

    Other than these, stress symptoms and minor root, sheath and leaf diseases may also be associated in incidental underwater situations. Too much of a good thing may not be necessarily good.

    What we need to do:

    If possible, lower the water level to salvage the crop as soon as possible.

    Scout for autumn decline (black root rot). Rice roots from the deep water part of the field (which is anaerobic) need to be compared with rice roots from the levee. In the presence of autumn decline, the field needs to be “drained and dried” to allow oxygen in to soil. To read more on scouting and management of autumn decline, go here.

    Scout for sheath blight–taking the level of excessive water into consideration, scout both lower and upper rice crop canopy for possible sheath blight lesions. To read more on scouting and management of sheath blight go here.

    Tags: , , , , , , ,

    Leave a Reply

    Name and Email Address are required fields. Your email will not be published or shared with third parties.

    Agfax Rice News

    AFB Rice Close: Jan, March Chart Bullish Key Reversals11-26

    Residential Heating Oil Prices Lower11-26

    Propane Stocks Fall 2M Barrels11-26

    Gasoline Prices Drop 7 Cents11-26

    Diesel Prices Fall 3 Cents11-26

    Farm Income Down 21%; Expenses Up 5.7% – USDA Forecast11-26

    Keith Good: Net Farm Income to Drop 21.1% from 2013, ERS Forecasts11-26

    Tax Breaks: Waiting for 2014 Equipment Deduction, Biofuel – DTN11-25

    AgFax Rice Review: Iraq Resumes U.S. Purchases; Cambodia Wins Best Rice Award11-25

    Texas Crop, Weather: Water Supply, Crop Prices Remain a Concern11-25

    Keith Good: Farmers Care About a Labor Force, Not Politics — AFBF11-25

    AFB Rice Close: Futures Turn Lower11-24

    Louisiana: Rains, Frost Keep Growers Out of Fields – USDA11-24

    Louisiana Rice: Last of Verification Fields Harvested, Yields Good11-24

    DTN Fertilizer Outlook: Winter’s Arrival May Delay Some Buying11-24

    Arkansas: Rice, Cotton Yields Get Boost from Weather11-24

    Keith Good: EPA Decision on Renewable Fuels Mandate Delayed to 201511-24

    Rice Comment: The Case for Neonicotinoid Seed Treatment11-22

    U.S. Rice: Rain Stalls Texas 2nd Crop Harvest; Crop Sales Continue11-22

    Rice Market: Sale to Iraq Moves the Market11-22

    Ag Labor: Immigration Order Provides Little Long-Term Benefit – DTN11-21

    AFB Rice Close: Prices See More Slight Gains11-21

    Ag Policy: Farm Bills Need Long-Term View11-21

    Mississippi: 7 Farm Bill Workshops Slated for December11-21

    Vilsack: Immigration Order Creates ‘Stability’ in Ag Work Force — DTN11-21

    Keith Good: What’s Next for Meat Labeling?; Sugar Prices Take Tumble11-21

    AFB Rice Close: Prices Continue to Climb11-20

    Keith Good: Weather Brings Close to Upper Mississippi Shipping Season11-20

    AFB Rice Close: Bulls Carry the Day11-19