Plant Health Initiative

Diagnostic and Field Guides

A Visual Guide to the Number of Soybean Aphids per Leaflet.

Soybean Diseases. CSI 0004. Iowa State University Extension online publications.

Soybean Disease and Pest Management Field Guide
Available free of charge from Iowa State University Extension online publications

Corn & Soybean Field Guide: 2011 Edition
Available from Purdue University Education Store

Soybean Aphid Management field guide
Available free of charge from Iowa State University Extension online publications.

Corn, Soybean, Wheat, and Alfalfa Field Guide
Ohio State University Bulletin 827 — available as a pdf file

A Visual Guide to the Number of Soybean Aphids per Leaflet. Photos of soybean leaflets with a specific number of aphids displayed will help you make accurate counts when scouting this pest. Available from the University of Wisconsin Nutrient and Pest Management program at 608-265-2660 or view pdf online.

Identifying Natural Enemies in Field Crops
This guide is divided into sections by major groups of natural enemies and spiders: beetles, true bugs, lacewings, predatory flies, parasitoids, spiders and ants. The plastic-coated 3.5 x 5 inch guide is available from the Michigan State University IPM Program.

Online Diagnostic Guides

Soybean Disases and Injury Image Gallery and Entomology (Insect) Image Gallery
Iowa State University

Soybean Diagnostic Guide
United Soybean Board

Soybean Insect Scouting Calendar - Purdue University

Soybean Growth and Development

A 28-page publication that explains soybean growth and development through the life cycle of a maturity group II variety.  Available from the Iowa State University Extension Publication Center at (515) 294-5247.

Identifying Soybean Growth Stages. One-page pdf document with color illustrations. Michigan State University.

Weed Identification

Weeds of the North Central States

Weed Identification
Iowa State University

Weed Identification and Weed Photos
University of Illinois

IPM Quick Guide: Troublesome Weeds of Wisconsin.
Provides key characteristics of seven different weeds and how to avoid confusion with weeds of similar appearance. Weeds included are: giant ragweed, Eastern black nightshade, waterhemp, wirestem muhly, woolly cupgrass, yellow foxtail, and large crabgrass. View online or order a copy from the University of Wisconsin Nutrient and Pest Management Program at 608-265-2660.