---
title: Early-Season Crop Diseases to Watch in Soybeans and Yellow Field Peas
description: Stay ahead of early-season diseases in soybeans and yellow field peas with insights on symptoms, conditions, and management practices to protect your crops.
---

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# [Early-Season Crop Diseases to Watch in Soybeans and Yellow Field Peas](https://blog.puris.com/early-season-crop-diseases-to-watch-in-soybeans-and-yellow-field-peas)

 Written by [Christopher Werth](https://blog.puris.com/author/christopher-werth) | Jun 1, 2026 6:24:31 PM

As we move through early emergence and stand establishment, crop conditions are often dictated less by what we see above ground and more by what’s happening below the soil surface. Cool, wet conditions across much of the Northern Plains and Upper Midwest can quietly set the stage for early-season disease pressure in both soybeans and yellow field peas.

Understanding what to look for early, along with the conditions that favor disease development, can help guide management decisions and explain variability in emergence and stand.

 

# **Soybeans**

****

### **What to Watch For**

**1. Seed Decay and Damping-Off (Pythium & Phytophthora)**

These pathogens are among the most common early-season issues and are present in most soils.

**2. Seedling Blights (Rhizoctonia & Fusarium)**

Unlike damping-off, these diseases often allow plants to emerge but reduce early-season growth and competitiveness.

**3. Early Foliar Disease Development (Lower Canopy)**

These typically begin in the lower canopy and rarely cause early yield loss but can indicate favorable conditions for disease progression later in the season.

### **Conditions That Favor Disease**

Slower emergence extends the window for infection by multiple pathogens.

# **Yellow Field Peas**

****

### **What to Watch For**

**1. Root Rot Complex (Aphanomyces, Fusarium, Pythium, Rhizoctonia)**

In peas, early-season disease is typically not caused by a single pathogen but by a complex, making diagnosis and management more challenging.

**2. Aphanomyces Root Rot (High Concern in Wet Years)**

This disease is particularly important because it persists in soils long term and is strongly tied to moisture conditions.

**3. Early Foliar Diseases (Ascochyta & Bacterial Blight)**

These diseases can begin early, especially in residue-heavy systems or when infected seed is present.

### **Conditions That Favor Disease**

# **Key Takeaways**

Early-season diseases in both soybeans and yellow field peas are largely driven by environmental conditions at and shortly after planting, particularly temperature and moisture.

While in-season rescue options are limited, early scouting and accurate identification help inform:

In short, early-season disease pressure often sets the tone for the rest of the season — and the fields that struggle early are rarely random.

 

[View full post](https://blog.puris.com/early-season-crop-diseases-to-watch-in-soybeans-and-yellow-field-peas)

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