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24 hours American elm application April 15 arborists beetle feeding Bidrin bioassay breeding burning checked chemical cities and villages control Dutch elm control of Dutch control recommendations cooperation Department of Agriculture Disease Control Program diseased elms diseased trees dormant season dormant spray Dutch elm disease effective elm bark beetles elm disease control elm wood equipment European elm bark feeding niches forester fungus healthy tree helicopter spraying infected tree insecticide Kenosha Kenosha County laboratory League of Wisconsin losses Madison methoxy methoxychlor Milwaukee mist blower obtained park personnel Plant Industry Division Plant Pathology problem prompt removal protect elms reason removal and destruction removed and destroyed reported robins root graft barriers root graft control sanitation shade tree Shorewood smaller European elm specimens spray program sprayed trees spread of Dutch street trees survey TCPA tests treated tree ordinance University of Wisconsin Vapam Wisconsin Department Wisconsin Municipalities