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 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