Con's Weed Control Service, Inc. Residential & Commercial Spraying. Lawn Weed & Feed Tree Health Care Services Industrial Weed Control 406-488-7422 Free Estimate. Serving MT & ND Con & Lynn Donvan donvan@midrivers.com 277686 Con's Weed Control Service, Inc. Residential & Commercial Spraying. Lawn Weed & Feed Tree Health Care Services Industrial Weed Control 406-488-7422 Free Estimate. Serving MT & ND Con & Lynn Donvan donvan@midrivers.com 277686