Farm Talk


August 20, 2013

Disease possibilities in crops increase with rain

Parsons, Kansas — Recent rains have created conditions conducive to disease development on corn and soybeans according to Jill Scheidt, an agronomy specialist with University of Missouri Extension in Barton County.

“Rain carries funguses in the air which makes it easier for the funguses to spread.  Diseases like rust, gray leaf spot, northern corn leaf blight, brown spot, crazy top and stalk and ear rots develop best in wet and humid conditions,” said Scheidt. Fungicides that effectively and economically suppress these diseases are most effective if applied while corn is in the vegetative stage, or before silking.  If corn already has silks, plants will not respond as well to a treatment.“It is not economical to apply a fungicide past the tasseling stage,” said Scheidt.

Sudden Death Syndrome or SDS may become a concern with wet conditions after planting and later in the season during bloom.  According to Scheidt, wet conditions early in the season are conducive to the infection of SDS and wet conditions during bloom or late in the season are conducive to symptoms being expressed. “It is difficult to assess yield loss due to SDS. Yield loss is more likely if leaf tissue dies and pods or blooms are aborted rather than seeing severe yellowing between the veins,” said Scheidt. Other foliage diseases that affect soybeans during wet conditions are septoria brown spot, downy mildew and bacterial blight. Young plants that are in flooded or saturated soils have an increased chance of root rot diseases.

Flooding causes problems in corn and soybean plants as well. Saturated soils along with moving water can cause lodging because the roots do not have a solid structure to hold on to in order to stay upright. “The longer an area is flooded, the more damage it will cause,” said Scheidt.

If the weather remains humid after the rains have ceased, it is more likely ear rot on corn will occur. If the humidity is less dense and the air is drier, there is a better chance of not developing diseases. “If a field is underwater and is going to be harvested, it should be harvested as soon as it is ready and the combine settings should be adjusted to allow less trash and sediment to stay in the combine. Unfortunately, there is no fungicide producers can apply to seed after it is harvested and goes into the grain bin to eliminate funguses already present on the seed,” said Scheidt.

Some insect threats have slowed with the increased rain. Grasshoppers, spider mites and thrips are less of a threat in wet conditions.  Pod worm, also known as corn earworm, and bean leaf beetle feeding are not affected by wet conditions and still need to be scouted.  Threshold levels for foliage feeding on soybean are 30 percent defoliation before bloom and 20 percent defoliation during and after bloom. “Now is the time to be scouting regularly for pod feeders such as pod worms. Pod worms are rapid pod feeders and can destroy much of a field in one night; threshold levels for pod worm in soybean are one per foot,” said Scheidt. £

Text Only
  • cornplantlatemay2.jpg WASDE report eases low crop price fears

    USDA’s April 9 World Agricultural Supply and Demand Estimates continued a series of recent reports that have offered corn and soybean producers a more optimistic grain-price outlook than what was expected for most of the winter, Purdue Extension agricultural economist Chris Hurt says.

    April 15, 2014 1 Photo

  • USDA: Corn acres expected to drop 4%

    The amount of American cropland devoted to corn is expected to shrink about 4 percent this year as farmers devote more acres to soybeans, the U.S. Department of Agriculture said last week.

    April 8, 2014

  • Bt-resistant rootworms ID’d in five states

    Researchers say bugs are developing resistance to the widely popular genetically engineered corn plants that make their own insecticide, so farmers may have to make changes.

    April 1, 2014

  • MU economist: Corn, bean price volatility next 5 years

    Expect volatility in the soybean and corn markets over the next five years, said Pat Westhoff, director of the University of Missouri Food and Agricultural Policy Research Institute (MU FAPRI).
    Look for corn prices to drop to $4 per bushel and soybean to $10 per bushel on average for the next five years, he said.

    March 25, 2014

  • marestail.jpg Plan now to control marestail in soybeans

    Controlling marestail in soybeans has been a big challenge for Kansas no-till producers in recent years.
    Because soybeans are generally planted later in the season, and marestail generally germinates in the fall or early spring, application timing and weed size are critical factors to successful control.

    March 18, 2014 1 Photo

  • Checking alfalfa for winter injury

    In the last couple of weeks, I’ve heard many concerns about alfalfa production for this spring.
    Cold temperatures and lack of snow cover are the two main issues producers are worried about for next season’s crop production, as certainly the alfalfa plant could die if exposed to extremely cold temperatures. In general, alfalfa plants can tolerate up to three weeks of winter injury before the plants are killed.

    March 11, 2014

  • soypods.jpg USDA reports on status of GE crops

    Genetically engineered (GE) varieties with pest management traits became commercially available for major crops in 1996.
    More than 15 years later, adoption of these varieties by U.S. farmers is widespread and U.S. consumers eat many products derived from GE crops — including corn-meal, oils, and sugars — largely unaware that these products were derived from GE crops.

    March 4, 2014 1 Photo

  • wheat-head.jpg Everest still leads Kan. wheat acres

    For the second year in a row, a variety of wheat developed by Kansas State University, is the leading variety in Kansas.

    February 25, 2014 1 Photo

  • RickReimer.jpg Innovation, exports fuel soybean demand

    Brent Hayek is revved up about potential new uses for soybeans, and he is piling up the miles to share his enthusiasm.

    February 18, 2014 2 Photos

  • red_clover.jpg Seed legumes on snowy fields

    Winter seeding clover over grass pastures works best in February. Frozen fields are ideal and a snow cover makes seeding easier.

    February 11, 2014 1 Photo

Hyperlocal Search
Premier Guide
Find a business

Walking Fingers
Maps, Menus, Store hours, Coupons, and more...
Premier Guide
Seasonal Content