In this issue:

ECB and CEW Moth Flight Update

Comprehensive Review of Carbaryl (Sevin) Completed

Daily Crop "ET's" at their Peak

Use of Mosquito Trapping Devices on the Homefront

Daily Crop "ET's" at their Peak

Jerry Wright, Extension Engineer, University of Minnesota Extension Service, Morris, MN.

Daily water usage for most crops is at its full potential (0.15 to 0.3 inches per day depending on temperature and cloud cover). This will continue for at least the next 4 to 6 weeks. Keeping track of daily crop water usage (ET) for the past 2 to 5 days can greatly assist an irrigation manager in deciding when to startup the next irrigation.

For most crops in full canopy and flowering, its generally best to start irrigating when the soil water in the rooting zone has depleted 1/2 to 3/4 inches of water depending on the crop's rooting depth and the water holding capacity of the soil.

The past days' estimated daily crop ET potentials for different locations across the state of Minnesota and Wisconsin can be viewed via a color-coded map available on the internet at the following address: http://www.soils.wisc.edu/wimnext/

These estimated daily ETs for a specific location within Minnesota or Wisconsin can be sent via email every morning if requested via the contact address located at the above web site. Daily ET information for specific locations in Minnesota may also be obtained from the following offices:

East Otter Tail SWCD office @ Perham (218) 346-4260 ext 123
Hubbard SWCD office @ Park Rapids (218) 732-1963
Sherburne SWCD office @ Big Lake 763-241-1170 ext 3
U of M - West Central ROC @ Morris (320) 589-1711

Regular in-field soil moisture checking and keeping track of a crop's daily ET use can go a long ways in helping an operator optimize the crop's growth while reducing the potential for leaching of some crop inputs like nitrogen into the groundwater.

Information on how to use daily crop ET information is reviewed in University of Minnesota Extension Service's Irrigation Scheduling bulletin #1322 that is fully viewable at http://www.extension.umn.edu/distribution/cropsystems/DC1322.html. Other information can be obtained from Jerry Wright, Extension Engineer, via email at jwright@.umn.edu or by calling at the West Central Research and Outreach Center in Morris, MN at (320) 589-1711.

Co-Editors: Bill Hutchison, Department of Entomology, University of Minnesota, hutch002@tc.umn.edu
Jeanne Ciborowski, IPM Program, Minnesota Department of Agriculture, jeanne.ciborowski@state.mn.us
Production Editor: Suzanne Wold, Research Fellow, Department of Entomology, University of Minnesota, woldx018@tc.umn.edu

Last Revised July 23, 2003.
The University, including the Minnesota Extension Service, is an equal opportunity educator and employer. ©1999-2003 Minnesota Extension Service, University of Minnesota. All rights reserved. Contact copyright@extension.umn.edu for information on reproduction or use of this material.