Early Season Soybean Diseases

May 7, 2020

When we talk about early season soybean diseases, we are referencing soybean root pathogens that can affect the health of the plant early on in its growth from first imbibition - the seed’s first taste of moisture, to germination, through emergence and the early vegetative stages of the plant.

There are four major pathogenic fungi that can be hazardous to a young soybean causing seed rot, seedling mortality, and root and stem decay. These pathogens are Pythium, Fusarium, Rhizoctonia, and Phytophthora. While most early season soybean diseases do occur in cool and wet soils, some pathogens thrive in warm and dry soil conditions.

Both Pythium and Fusarium are more active in cooler and wetter environments. Pythium is most likely to occur in moist soils with temperatures ranging from 50-59°F (Pythium ultimum*). One of the more common species of Fusarium is most active in moist soils with temperatures ranging from 57-73°F (Fusarium oxysporum sp.*).

On the other end of the spectrum, Rhizoctonia and Phytophthora are two pathogens that tend to prefer warmer soils. One strain of Rhizoctonia (Rhizoctonia solani*) is most detrimental to soybeans when soil temperatures are in the 77-85°F range and can be active in dry soil conditions. The fourth major pathogen in this group, Phytophthora, is one of the leading yield robbing pathogens in soybeans and is most active in warmer soil environments ranging from 77-86°F (Phytophthora sojae*).

Your crop’s highest potential starts with the seed. Good planting practices that minimize stress and the use of seed applied fungicides are the best ways of managing early season soybean diseases. Once the seed is in the ground, not much can be done to defend against them.

Hoegemeyer’s LumiGEN™ seed treatment provides a comprehensive portfolio with industry-leading and proven fungicide components to protect against all these pathogenic fungi. Protect your seed’s potential and your bottom line by protecting your crop with LumiGEN.

Soil temperatures identified in the Compendium of Soybean Diseases, 3rd Edition.

Table adapted from: University of Wisconsin Field Crops Plant Pathology – Plant Health Initiative

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Performance Through Protection: NEW RIGHT STAND® Soybean Seed Treatment for 2018

November 6, 2017

Soybean seed treatments provide a means to capture greater yield by protecting the genetic yield potential of every seed, bag and acre.  Seed treatments enable each field to maximize productivity as well as minimize risk. There are no rescue treatments for soil insects or pathogens. Growers can only protect each field from them through a preventative approach. Here are a few reasons why seed treatment are profitable.

Wider Planting Window

  • Planting in cool, wet soils may result in slower emergence
  • Increased seed and seedling disease pressure
  • Seed treatments allow for earlier planting dates and significantly reduced likelihood of replant

Tolerance to High Residue Environments

  • Increased crop residues can harbor insects and pathogens
  • Residue is associated with cool soil temperatures which delay emergence

Improved Soybean Plant Performance

  • Increased stand
  • Improved seedling vigor and emergence
  • 2.5 bushel average yield advantage for Right Stand over no treatment
  • 2-10 bushel yield advantage for Right Stand® + ILeVO® over base package depending on severity of SDS and SCN pressure

However, not all seed treatments are created equal. The true value of a specific seed treatment can be obtained with three questions.

  1. What individual products make up the seed treatment package?
  2. What rate(s) are being applied? This is critically important!
  3. How accurately are the individual products being applied?

The Right Stand® soybean seed treatment from Hoegemeyer is a proprietary mix of chemistries including an insecticide, a biological root growth stimulant, and multiple mode of action fungicides applied at full labeled rates providing broad spectrum pest protection.

A common misconception is that seed treatments are only needed for early planting dates. Although early planting dates are at increased risk from several pests, a common disease such as phytophthora which is the #1 most yield limiting soybean disease in the U.S., is also very active under warm and wet soil conditions. Areas in fields with poor drainage and compaction are especially prone to phytophthora infection. Soybean plants that are partially susceptible may appear stunted and yield less than a resistant or non-infected plant.

New for 2018, Right Stand includes Dupont™ Lumisena™ for industry leading control of phytophthora as well as improved seedling vigor and emergence. DuPont™ Lumisena™ contains a new active ingredient - Oxathiapiprolin. This new mode of action fungicide works to control oomycete infestation during multiple stages of the pathogen’s life cycle, resulting in increased stands, healthier plants, and overall greater crop efficiency.

Contact your local Hoegemeyer DSM or Agronomist to put Right Stand with Dupont Lumisena to work on your farm in 2018.

ILeVO® is a registered trademark of Bayer. EverGol® is a registered trademark of Bayer.

Categories: seed treatment, Soybeans     Comments: 0