Hyper-linked soybean seedling insect diagnostic guide

John Obermeyer and Larry Bledsoe
Purdue Extension Entomology

The following diagnostic guide has been developed to facilitate field identification of soybean insect pests early in the season. Possible pest causes are listed for each symptom below. Insect names are hyper-linked, clicking on them will link to pages for further information about pest, plant damage, scouting methods, and links to Purdue's conventional management guidelines.

Happy and accurate scouting!

	General Appearance: Seed eaten or sprout cut off Symptom: Seed, hypocotyl, or cotyledons hollowed out Cause(s): Seedcorn maggot Wireworms Seedcorn beetles
	General Appearance: Uneven growth of plants or plants stunted, stem chewed off or killed Symptom: Plants stunted, wilted or dead in isolated or widespread areas of field Cause(s): Seedcorn maggots White grubs Wireworms Cutworms Slugs
	OR
	General Appearance: Uneven growth of plants or plants stunted, stem chewed off or killed Symptom: Upper part of plant may be chewed off Cause(s): Cutworms
	General Appearance: Plants discolored Symptom: Leaves yellow, plants stunted Cause: White grubs Grape colaspis grubs
	General Appearance: Leaf tissue removed Symptom: Leaves skeletonized or lacy in appearance; many veins left intact Cause(s): Japanese beetle Mexican bean beetle Early instar green cloverworm
	OR
	General Appearance: Leaf tissue removed Symptom: Rounded holes in leaves Cause: Bean leaf beetle
	OR
	General Appearance: Leaf tissue removed Symptom: Leaves torn and ragged, stems may have feeding scars or be cut off Cause(s): Cutworms Alfalfa weevil/beetle complex
	OR
	General Appearance: Leaf tissue removed Symptom: Large irregular holes in leaves Cause(s): Green cloverworm Grasshopper nymphs Various caterpillars

Return to April 15, 2004 issue New Agriculture Network.

Funding to initiate this network was provided by the American Farmland Trust and EPA Region 5.
Web site is hosted by the MSU IPM Program.
Contact webmaster. Updated 04/15/04