This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension. Reprinting cannot be used to endorse or advertise a commercial product or company. This file was generated from data base SR on 07/28/98. Data base SR was last revised on 07/28/98. For more information about this data base or its contents please contact cook@msue.msu.edu . Please read our disclaimer for important information about using our site.