Root Protection and Reduced Rates of Soil Insecticides: Results from Illinois On-Farm Studies and University Experiments

Thumbnail Image
Date
1991-12-04
Authors
Gray, Michael
Steffey, Kevin
Oloumi-Sadeghi, Hassan
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Journal Issue
Is Version Of
Versions
Series
Series
Proceedings of the Integrated Crop Management Conference
Iowa State University Conferences and Symposia

The Iowa State University Integrated Crop Management Conference is Iowa's premier crop production education event. No other program in Iowa brings together the diverse range of topics, slate of expert presenters and results of the latest University research.

The ICM Conference offers workshops focusing on the latest in crop production technology. Experts from Iowa and surrounding states will provide research updates and results in soil fertility, soil and water management, crop production and pest management.

Department
Abstract

Entomologists at several Midwestern universities have evaluated the root protection afforded by using less than labeled application rates of soil insecticides for corn rootworms since the early 1970s (Gray et. al. 1990). Most soil insecticides registered for corn rootworm larval control are labeled to be applied at 1.0 pound of actual insecticide per acre. This rate was established with little regard for the ability of currently grown hybrids to compensate for corn rootworm injury (Steffey et al. 1989). In addition, the 1.0 pound rate was intended to provide root protection at or below a root rating of 3 (several roots eaten off to within 1 112 inches ofplant) on the Iowa 1 to 6 scale (Hills and Peters 1971). Some entomologists currently believe the economic injury level of 3 is too low and that a root rating of 4 (1 node of roots completely destroyed) might be more realistic (Sutter et al. 1990). Achieving a root damage rating of 3 or below may not be worth the environmental and economic costs associated with keeping insecticide application rates at the 1.0 pound level.

Comments
Description
Keywords
Citation
Source
Subject Categories
Copyright