Dec 13, 2019
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AgWeb Online Field Guide

Welcome to AgWeb's Online Field Guide, a searchable database of common weeds, diseases and pests found in corn, soybeans and wheat. Identify crop problems and learn how to manage them.


Please click on one of the links below to get started. Here's an overview of how to use the guide.


bull thistle smallWeed Identification Guide

Find out what plants are plaguing your fields.




DownyMildew small

Disease Identification Guide

Pinpoint what's ailing your crops.




southern rootworm soybean MER copyPest Identification Guide

Discover which insects have been gnawing on your plants.




Lance Nematode 1235021 LGPTAll About Nematodes

Learn why these tiny parasites can be a major threat.




More on weed, disease and pest management:

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