Soybean Diseases to Watch

Fewer farmers consider growing second-year soybeans, but the idea may have more appeal in 2017 than in prior years, considering current commodity prices.
Fewer farmers consider growing second-year soybeans, but the idea may have more appeal in 2017 than in prior years, considering current commodity prices.

Every growing season brings its own unique conditions and challenges. In recent years, these soybean diseases have earned more
attention. Curated from Extension, here are top scouting tips as well as prevention and treatment options.

Click here to download and print this checklist.

Frogeye Leaf Spot

  • Infection most often occurs after flowering.
  • Fungicide seed treatments can reduce the risk of infection. Fungicide application can reduce disease severity. In some states there are populations that are resistant to the strobilurins.
  • Symptoms include discrete, roundish lesions with light centers and dark reddish-purple margins are apparent on leaves.

Septoria Leaf Spot

  • Also known as brown spot has caused defoliation in fields before R2 stage. Infection occurs as early as the V2 growth stage on lower leaves.
  • Symptoms start as dark brown, irregular spots on both upper and lower leaf surfaces. Typically lesions have a yellow or chlorotic halo when held up to a back light.
  • Irregularly shaped blotches form as adjacent lesions merge. Leaves become yellow to rusty brown.

Soybean Rust

  • Soybean rust can cut yields by 50% or more in favorable conditions.
  • First, tan or reddish-brown lesions form on the underside of leaves. Then, in those lesions small pustules/blisters develop, which break open and release masses of spores.
  • Diagnosis at an early stage is necessary for successful management.

Sudden Death Syndrome (SDS)

  • Typically the damage isn’t visible until fl owering or later in the season.
  • Damage can be greater with high soybean cyst nematode (SCN) populations.
  • SDS is sometimes mistaken for brown stem rot. To diagnose, split the lower stem of plants to determine which fungal disease is present.

White Mold

  • The infection is active at the R1 stage. However, symptoms show later in the season when individual plants wither and die in an otherwise healthy field.
  • The stems of infected plants have a bleached area, which radiates several inches from the leaf axil.
  • The most telling symptom is the fluffy, stringy, white mycelium on the stem.



Latest News

How Important is U.S. Ag and Food to the Economy?

In celebration of National Ag Day and National Ag Week, the 2023 Feeding the Economy report shows just how vital the industry is to U.S. families, communities and the world.

Ferrie: Ready, Set, Whoops! A Fast Start To Fieldwork Could Cost You Big In Corn At V5

Caution can help you avoid creating compaction or density layers. Plus, if you're applying anhydrous now, allowing 14 days between the application and planting can prevent dead or damaged plants and costly yield dings.

Nebraska Farmland Values Jump 14% in 2023 — Up 30% in Two Years

This year marks the second-largest increase in the market value of agricultural land in Nebraska since 2014 and the highest non-inflation-adjusted statewide land value in the 45-year history of the survey. 

U.S. Milk Production and Cow Numbers Both Rise

The February 2023 USDA Milk Production report showed an 0.8% increase in year-over-year milk production with a total of 17.7 billion lbs. of milk. Also following suit, U.S. cow numbers also documented growth.

Crude Oil Prices Drop Below $70: What is the Outlook for Consumers at the Pump and Farmers Heading Into Spring Planting?

Oil prices are also off their highs of last year and gas and diesel prices are also sliding at the pump, but will that trend continue ahead of planting?   Energy experts are hoping the answer is yes.  

Can History Making $20 Billion in Inflation Reduction Act Get Rolled Out Quickly Enough?

Industry experts say the new legislative package represents a 'generational opportunity' for conservation funding and needs to reach U.S. farmers and livestock producers sooner rather than later, starting this spring.